Updated on 2021/07/16

写真a

 
KITAURA, Ryo
 
Organization
Graduate School of Science Division of Material Science Physical Chemistry Associate professor
Graduate School
Graduate School of Science
Undergraduate School
School of Science
Title
Associate professor
Contact information
メールアドレス

Degree 1

  1. 博士(工学) ( 2003.3   京都大学 ) 

Research Interests 5

  1. Atomic layers, Nanocarbons, nanowires, nanotubes, low-dimensional materials, electronic properties, electronic devices, chemical vapor deposition, electron microscope

  2. 薄膜結晶成長

  3. ナノサイエンス

  4. 低次元ナノ物質

  5. 光・電子物性

Research Areas 6

  1. Others / Others  / Nano Structural Science

  2. Others / Others  / Functional Material Chemistry

  3. Others / Others  / Physical Properties I

  4. Others / Others  / Functional Materials/Device

  5. Others / Others  / Micro/Nanodevice

  6. Nanotechnology/Materials / Nanostructural physics

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Current Research Project and SDGs 5

  1. Direct observation of biomolecules using graphene-environmental cell

  2. 原子層/分子集積体ヘテロ界面を用いた機能開拓

  3. ハイクオリティ原子層ヘテロ構造の作製とバレーフォトニクスデバイスの創製

  4. 収束電子ビームを用いたナノ切削による新奇パイ電子系物質の創製と構造物性研究

  5. 原子層における超伝導探索

Research History 8

  1. Nagoya University

    2018.4 - 2020.3

  2. Nagoya University

    2009.1 - 2009.12

  3. Nagoya University   Graduate School of Science Division of Material Science   Associate professor

    2008.8

  4. 名古屋大学大学院理学研究科物質理学専攻准教授

    2008.8

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    Country:Japan

  5. Nagoya University   Graduate School of Science Division of Material Science   Assistant Professor

    2007.4 - 2008.7

  6. Nagoya University   Graduate School of Science Division of Material Science   Assistant

    2007.3

  7. 名古屋大学大学院理学研究科物質理学専攻助教

    2005.4 - 2008.7

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    Country:Japan

  8. (株)豊田中央研究所 研究員

    2003.4 - 2005.3

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    Country:Japan

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Education 3

  1. Kyoto University   Graduate School, Division of Engineering

    1999.4 - 2003.3

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    Country: Japan

  2. Kyoto University   Graduate School, Division of Engineering   Chemical Engineering

    1998.4 - 2000.3

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    Country: Japan

  3. Osaka Prefecture University   Faculty of Engineering   Chemical Engineering

    1994.4 - 1998.3

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    Country: Japan

Professional Memberships 8

  1. 日本物理学会

  2. 日本化学会

  3. 応用物理学会

  4. フラーレン・ナノチューブ学会

  5. 分子科学会

  6. 錯体化学会

  7. 日本顕微鏡学会

  8. THE CHEMICAL SOCIETY OF JAPAN

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Committee Memberships 1

  1. 日本化学会東海支部   常任幹事  

    2011.4 - 2013.4   

 

Papers 233

  1. Analysis of therapeutic potential of monocytic myeloid-derived suppressor cells in cardiac allotransplantation.

    Fujimoto K, Uchida K, Yin E, Zhu J, Kojima Y, Uchiyama M, Yamamoto Y, Bashuda H, Matsumoto R, Tokushige K, Harada M, Inomata T, Kitaura J, Murakami A, Okumura K, Takeda K

    Transplant immunology   Vol. 67   page: 101405   2021.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.trim.2021.101405

    PubMed

  2. Enhanced Exciton-Exciton Collisions in an Ultraflat Monolayer MoSe2 Prepared through Deterministic Flattening. International journal

    Takato Hotta, Akihiko Ueda, Shohei Higuchi, Mitsuhiro Okada, Tetsuo Shimizu, Toshitaka Kubo, Keiji Ueno, Takashi Taniguchi, Kenji Watanabe, Ryo Kitaura

    ACS nano   Vol. 15 ( 1 ) page: 1370 - 1377   2021.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Squeezing bubbles and impurities out of interlayer spaces by applying force through a few-layer graphene capping layer leads to van der Waals heterostructures with the ultraflat structure free from random electrostatic potential arising from charged impurities. Without the graphene capping layer, a squeezing process with an AFM tip induces applied-force-dependent charges of Δn ∼ 2 × 1012 cm-2 μN-1, resulting in the significant intensity of trions in photoluminescence spectra of MoSe2 at low temperature. We found that a hBN/MoSe2/hBN prepared with the "graphene-capping-assisted AFM nano-squeezing method" shows a strong excitonic emission with negligible trion peak, and the residual line width of the exciton peak is only 2.2 meV, which is comparable to the homogeneous limit. Furthermore, in this high-quality sample, we found that the formation of biexciton occurs even at extremely low excitation power (Φph ∼ 2.3 × 1019 cm-2 s-1) due to the enhanced collisions between excitons.

    DOI: 10.1021/acsnano.0c08642

    Web of Science

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  3. Exciton diffusion in hBN-encapsulated monolayer MoSe2

    Takato Hotta, Shohei Higuchi, Akihiro Ueda, Keisuke Shinokita, Yuhei Miyauchi, Kazunari Matsuda, Keiji Ueno, Takashi Taniguchi, Kenji Watanabe, Ryo Kitaura

    PHYSICAL REVIEW B   Vol. 102 ( 11 )   2020.9

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    Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    Excitons, quasiparticles composed of an electron and a hole, play an important role in optical responses in low-dimensional nanostructures. In this work, we have investigated exciton diffusion in monolayer MoSe2 encapsulated between flakes of hexagonal boron nitride (hBN/MoSe2/hBN). Through photoluminescence imaging and numerical solution of the two-dimensional diffusion equation, we revealed that temperature dependence of exciton mobility, mu(ex), in hBN/MoSe2/hBN shows a nonsaturating increase at low temperature, which is qualitatively different from those of quantum wells composed of compound semiconductors. The ultraflat structure of monolayer MoSe2 in hBN/MoSe2/hBN probably leads to the suppression of charged-impurity scattering and surface-roughness scattering.

    DOI: 10.1103/PhysRevB.102.115424

    Web of Science

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  4. Low frequency Raman study of interlayer couplings in WS2-MoS2 van der Waals heterostructures

    Saito Yuika, Kondo Takahiro, Ito Hiroki, Okada Mitsuhiro, Shimizu Tetsuo, Kubo Toshitaka, Kitaura Ryo

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( 6 )   2020.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  5. Observation of drastic electronic structure change in one-dimensional moiré crystals Reviewed International journal

    Sihan Zhao, Pilkyung Moon, Yuhei Miyauchi, Kazunari Matsuda, Mikito Koshino, Ryo Kitaura

    PHYSICAL REVIEW LETTERS   Vol. 124 ( 10 ) page: 106101 - 106101   2020.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    We report the first experimental observation of strong coupling effect in
    one-dimensional moir\'e crystals. We study one-dimensional double-wall carbon
    nanotubes (DWCNTs) in which van der Waals-coupled two single nanotubes form
    one-dimensional moir\'e superlattice. We experimentally combine Rayleigh
    scattering spectroscopy and electron beam diffraction on the same individual
    DWCNTs to probe the optical transitions of structure-identified DWCNTs in the
    visible spectral range. Among more than 30 structure-identified DWCNTs
    examined, we experimentally observed and identified a drastic change of optical
    transition spectrum in DWCNT with chirality (12,11)@(17,16). The origin of the
    marked change is attributed to the strong intertube coupling effect in a
    moir\'e superlattice formed by two nearly-armchair nanotubes. Our numerical
    simulation is consistent to these experimental findings.

    DOI: 10.1103/PhysRevLett.124.106101

    Web of Science

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    arXiv

    Other Link: http://arxiv.org/pdf/1906.09421v2

  6. STM/STS observation of Nb-doped WSe<sub>2</sub> atomic layer

    Sato Tomohiro, Huzi Naoki, Murai Yuya, Yoshida Syozi, Mogi Hiroyuki, Kitaura Ryo, Miyata Yasumitsu, Takeuchi Osamu, Shigekawa Hidemi

    Abstract book of Annual Meeting of the Japan Society of Vacuum and Surface Science   Vol. 2020 ( 0 ) page: 110 - 110   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Vacuum and Surface Science  

    <p>Recently, transition metal dichalcogenide monolayers (TMDC) such as MoS<sub>2</sub> or WSe<sub>2</sub> have attracted much attention due to their superior semiconducting properties, and realization of atomically thin electrical device based on TMDC has been strongly desired.</p><p></p><p>In this study, we have investigated atomic and electronic structure of Nb doped WSe<sub>2</sub> samples made by STM/STS. The Samples were prepared by two different growth condition. We evaluated the charge state of individual Nb dopant in WSe<sub>2</sub> by measuring dI/dV spectra.</p>

    DOI: 10.14886/jvss.2020.0_110

    CiNii Article

  7. Bayesian cosmic density field inference from redshift space dark matter maps.

    Bos EGP, Kitaura FS, van de Weygaert R

    Monthly notices of the Royal Astronomical Society   Vol. 488 ( 2 ) page: 2573 - 2604   2019.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/mnras/stz1864

    PubMed

  8. The Atomic and Electronic structure of 0° and 60° grain boundaries in MoS2

    Terunobu Nakanishi, Shoji Yoshida, Kota Murase, Osamu Takeuchi, Takashi Taniguchi, Kenji Watanabe, Hidemi Shigekawa, Yu Kobayashi, Yasumitsu Miyata, Hisanori Shinohara, Ryo Kitaura

    Frontiers in Physics   Vol. 7 ( MAR )   2019.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    We have investigated atomic and electronic structure of grain boundaries in
    monolayer MoS2, where relative angles between two different grains are 0 and 60
    degree. The grain boundaries with specific relative angle have been formed with
    chemical vapor deposition growth on graphite and hexagonal boron nitride
    flakes; van der Waals interlayer interaction between MoS2 and the flakes
    restricts the relative angle. Through scanning tunneling microscopy and
    spectroscopy measurements, we have found that the perfectly stitched structure
    between two different grains of MoS2 was realized in the case of the 0 degree
    grain boundary. We also found that even with the perfectly stitched structure,
    valence band maximum and conduction band minimum shows significant blue shift,
    which probably arise from lattice strain at the boundary.

    DOI: 10.3389/fphy.2019.00059

    Web of Science

    Scopus

    arXiv

    Other Link: http://arxiv.org/pdf/1809.00431v2

  9. Direct and Indirect Interlayer Excitons in a van der Waals Heterostructure of hBN/WS<inf>2</inf>/MoS<inf>2</inf>/hBN Reviewed International journal

    Mitsuhiro Okada, Alex Kutana, Yusuke Kureishi, Yu Kobayashi, Yuika Saito, Tetsuki Saito, Kenji Watanabe, Takashi Taniguchi, Sunny Gupta, Yasumitsu Miyata, Boris I. Yakobson, Hisanori Shinohara, Ryo Kitaura

    ACS Nano   Vol. 12 ( 3 ) page: 2498 - 2505   2018.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society  

    © 2018 American Chemical Society. A van der Waals (vdW) heterostructure composed of multivalley systems can show excitonic optical responses from interlayer excitons that originate from several valleys in the electronic structure. In this work, we studied photoluminescence (PL) from a vdW heterostructure, WS2/MoS2, deposited on hexagonal boron nitride (hBN) flakes. PL spectra from the fabricated heterostructures observed at room temperature show PL peaks at 1.3-1.7 eV, which are absent in the PL spectra of WS2 or MoS2 monolayers alone. The low-energy PL peaks we observed can be decomposed into three distinct peaks. Through detailed PL measurements and theoretical analysis, including PL imaging, time-resolved PL measurements, and calculation of dielectric function ϵ(ω) by solving the Bethe-Salpeter equation with G0W0, we concluded that the three PL peaks originate from direct K-K interlayer excitons, indirect Q-Γ interlayer excitons, and indirect K-Γ interlayer excitons.

    DOI: 10.1021/acsnano.7b08253

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  10. Identification of PL emissions from interlayer excitons in 2D van der Waals heter-ostructures

    Okada M., Kureishi Y., Kutana A., Watanabe K., Taniguchi T., Shinohara H., Kitaura R.

    Optics InfoBase Conference Papers   Vol. Part F78-JSAP 2017   2017

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  11. Fabrication and In Situ Transmission Electron Microscope Characterization of Free-Standing Graphene Nanoribbon Devices Reviewed International journal

    Qing Wang, Ryo Kitaura, Shoji Suzuki, Yuhei Miyauchi, Kazunari Matsuda, Yuta Yamamoto, Shigeo Arai, Hisanori Shinohara

    ACS NANO   Vol. 10 ( 1 ) page: 1475 - 1480   2016.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Edge-dependent electronic properties of graphene nanoribbons (GNRs) have attracted intense interests. To fully understand the electronic properties of GNRs, the combination of precise structural characterization and electronic property measurement is essential. For this purpose, two experimental techniques using freestanding GNR devices have been developed, which leads to the simultaneous characterization of electronic properties and structures of GNRs. Free-standing graphene has been sculpted by a focused electron beam in transmission electron microscope (TEM) and then purified and narrowed by Joule heating down to several nanometer width. Structure dependent electronic properties are observed in TEM, and significant increase in sheet resistance and semiconducting behavior become more salient as the width of GNR decreases. The narrowest GNR. width we obtained with the present method is about 1.6 rim with a large transport gap Of 400 meV.

    DOI: 10.1021/acsnano.5b06975

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  12. Single- And few-layer metallic NbS2: Growth, optical identification and transport properties

    Zhao S., Hotta T., Koretsune T., Watanabe K., Taniguchi T., Shinohara H., Kitaura R.

    Optics InfoBase Conference Papers   Vol. Part F132-JSAP 2019   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Optics InfoBase Conference Papers  

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  13. Observation and characterization of biexciton states in high-quality WS2 atomic layers

    Okada M., Miyauchi Y., Watanabe K., Taniguchi T., Matsuda K., Shinohara H.N., Kitaura R.

    Optics InfoBase Conference Papers   Vol. Part F132-JSAP 2019   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Optics InfoBase Conference Papers  

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  14. Direct chemical vapor deposition growth of WS2 atomic layers on hexagonal boron nitride. Reviewed International journal

    Mitsuhiro Okada, Takumi Sawazaki, Kenji Watanabe, Takashi Taniguch, Hiroki Hibino, Hisanori Shinohara, Ryo Kitaura

    ACS nano   Vol. 8 ( 8 ) page: 8273 - 8277   2014.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Atomically thin transition metal dichalcogenides (TMDCs) have attracted considerable interest owing to the spin-valley coupled electronic structure and possibility in next-generation devices. Substrates are one of the most important factors to limit physical properties of atomic-layer materials, and among various substrates so far investigated, hexagonal boron nitride (hBN) is the best substrate to explore the intrinsic properties of atomic layers. Here we report direct chemical vapor deposition (CVD) growth of WS2 onto high-quality hBN using a 3-furnace CVD setup. Triangular-shaped WS2 grown on hBN have shown limited crystallographic orientation that is related to that of the underlying hBN. Photoluminescence spectra of the WS2 show an intense emission peak at 2.01 eV with a quite small fwhm of 26 meV. The sharp emission peak indicates the high quality of the present WS2 atomic layers with high crystallinity and clean interface.

    DOI: 10.1021/nn503093k

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  15. Electronic structure of Eu atomic wires encapsulated inside single-wall carbon nanotubes Reviewed

    Ryo Nakanishi, Ryo Kitaura, Paola Ayala, Hidetsugu Shiozawa, Kathrin de Blauwe, Patrick Hoffmann, Daeheon Choi, Yasumitsu Miyata, Thomas Pichler, Hisanori Shinohara

    PHYSICAL REVIEW B   Vol. 86 ( 11 )   2012.9

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    X-ray absorption (resonant) photoelectron spectroscopy has been employed to investigate electronic structure of Eu atomic wires encapsulated in single-wall carbon nanotubes (SWCNTs). The measurements reveal that there is a substantial electron transfer of + 1.79 +/- 0.11 from a Eu atom to the surrounding SWCNT. The shape of the observed Fermi edge is different from that of a three-dimensional metal, suggesting that electrons in this one-dimensional system form a Tomonaga-Luttinger liquid.

    DOI: 10.1103/PhysRevB.86.115445

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  16. High-Yield Synthesis of Ultrathin Metal Nanowires in Carbon Nanotubes Reviewed

    R. Kitaura, R. Nakanishi, T. Saito, H. Yoshikawa, K. Awaga, H. Shinohara

    Angew. Chem. Int. Ed.   Vol. 48 ( 44 ) page: 8298 - 8302   2009

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/anie.200902615

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  17. Fabrication of metal nanowires in carbon nanotubes via versatile nano-template reaction Reviewed

    Ryo Kitaura, Naoki Imazu, Kelta Kobayashi, Hisanori Shinohara

    NANO LETTERS   Vol. 8 ( 2 ) page: 693 - 699   2008.2

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    Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    A nano-template reaction has been developed to fabricate metal nanowires using metallofullerene nanopeapods (i.e., carbon nanotubes (CNTs) encapsulating endohedral metallofullerenes) as starting materials. In this nanometer-scale reaction, the structure of resulting products should possess specific low-dimensional structures, because of their uniform starting orientation of metallofullerene molecules and the rigid restriction of reaction space by the presence of walls of CNTs. Using the nano-template reaction, we have fabricated various Gd nanowires, including a single Gd atomic chain, a one-dimensional alignment of Gd squares, and Gd nanowires that correspond to a one-dimensional segment of the bulk close-packed structure. The same reaction, in principle, can be applied to fabricate more than 20 different types of metal nanowires in the CNTs, which simply are dependent on the use of the corresponding different types of metallofullerenes as encapsulates in the CNTs. The present novel reaction will provide a wide variety of unusual low-dimensional nanowires and nanomaterials in the CNTs, which have not been synthesized via the fabrication techniques that have been reported so far.

    DOI: 10.1021/nl073070d

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    PubMed

  18. Formation and characterization of crystalline molecular arrays of gas molecules in a 1-dimensional ultramicropore of a porous copper coordination polymer Reviewed

    Ryo Kitaura, Ryotaro Matsuda, Yoshiki Kubota, Susumu Kitagawa, Masaki Takata, Tatsuo C. Kobayashi, Megumi Suzuki

    Journal of Physical Chemistry B   Vol. 109 ( 49 ) page: 23378 - 23385   2005.12

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    Molecules and atoms confined in a nanospace may have properties distinctly different from those of the bulk fluid, owing to the formation of a specific molecular array characteristic of nanospace. In situ synchrotron powder X-ray diffraction measurements have been used to observe confined guest molecules such as N2, O2, Ar, and CH4 in the well-regulated ultrarmicropore of a copper coordination polymer, 1 ([Cu 2(pzdc)2pyz]: pzdc = 2,3-pyrazinedicarboxylate and pyz = pyrazine). The obtained crystal structures indicate that guest molecules are confined in a linear fashion to form crystalline-like regular ordered arrays, in contrast to the situation in the gas and liquid state, even at temperatures above the boiling point, and the ordered arrays are characteristic of the kind of gas molecule and the geometrical and potential properties of the ultramicropore of 1. ? 2005 American Chemical Society.

    DOI: 10.1021/jp054411j

    PubMed

    J-GLOBAL

  19. Highly controlled acetylene accommodation in a metal-organic microporous material Reviewed

    R Matsuda, R Kitaura, S Kitagawa, Y Kubota, RV Belosludov, TC Kobayashi, H Sakamoto, T Chiba, M Takata, Y Kawazoe, Y Mita

    NATURE   Vol. 436 ( 7048 ) page: 238 - 241   2005.7

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    Metal - organic microporous materials(1-4) (MOMs) have attracted wide scientific attention owing to their unusual structure and properties, as well as commercial interest due to their potential applications in storage(5-9), separation(10,11) and heterogeneous catalysis(12,13). One of the advantages of MOMs compared to other microporous materials, such as activated carbons, is their ability to exhibit a variety of pore surface properties such as hydrophilicity and chirality, as a result of the controlled incorporation of organic functional groups into the pore walls(11,13-15). This capability means that the pore surfaces of MOMs could be designed to adsorb specific molecules; but few design strategies for the adsorption of small molecules have been established so far. Here we report high levels of selective sorption of acetylene molecules as compared to a very similar molecule, carbon dioxide, onto the functionalized surface of a MOM. The acetylene molecules are held at a periodic distance from one another by hydrogen bonding between two non-coordinated oxygen atoms in the nanoscale pore wall of the MOM and the two hydrogen atoms of the acetylene molecule. This permits the stable storage of acetylene at a density 200 times the safe compression limit of free acetylene at room temperature.

    DOI: 10.1038/nature03852

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  20. Functional porous coordination polymers

    S Kitagawa, R Kitaura, S Noro

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 43 ( 18 ) page: 2334 - 75   2004

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/anie.200300610

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  21. Formation of a one-dimensional array of oxygen in a microporous metal-organic solid Reviewed

    R Kitaura, S Kitagawa, Y Kubota, TC Kobayashi, K Kindo, Y Mita, A Matsuo, M Kobayashi, HC Chang, TC Ozawa, M Suzuki, M Sakata, M Takata

    SCIENCE   Vol. 298 ( 5602 ) page: 2358 - 2361   2002.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER ASSOC ADVANCEMENT SCIENCE  

    We report the direct observation of dioxygen molecules physisorbed in the nanochannels of a microporous copper coordination polymer by the MEM (maximum entropy method)/Rietveld method, using in situ high-resolution synchrotron x-ray powder diffraction measurements. The obtained MEM electron density revealed that van der Waals dimers of physisorbed O(2) locate in the middle of nanochannels and form a one-dimensional ladder structure aligned to the host channel structure. The observed O-O stretching Raman band and magnetic susceptibilities are characteristic of the confined O(2) molecules in one-dimensional nanochannels of CPL-1 (coordination polymer 1 with pillared layer structure).

    DOI: 10.1126/science.1078481

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  22. An ion-selective crown ether covalently grafted onto chemically exfoliated MoS2 as a biological fluid sensor

    Anastasios Stergiou, Christina Stangel, Ruben Canton-Vitoria, Ryo Kitaura, Nikos Tagmatarchis

    NANOSCALE   Vol. 13 ( 19 ) page: 8948 - 8957   2021.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    We describe the basal plane functionalization of chemically exfoliated molybdenum disulfide (ce-MoS2) nanosheets with a benzo-15-crown-5 ether (B15C5), promoted by the chemistry of diazonium salts en route to the fabrication and electrochemical assessment of an ion-responsive electrode. The success of the chemical modification of ce-MoS2 nanosheets was investigated by infrared and Raman spectroscopy, and the amount of the incorporated crown ether was estimated by thermogravimetric analysis. Raman spatial mapping at on-resonance excitation allowed us to disclose the structural characteristics of the functionalized B15C5-MoS2 nanosheets and the impact of basal plane functionalization to the stabilization of the 1T phase of ce-MoS2. Morphological investigation of the B15C5-MoS2 hybrid was implemented by atomic force microscopy and high-resolution transmission electron microscopy. Furthermore, fast-Fourier-transform analysis and in situ energy dispersive X-ray spectroscopy revealed the crystal lattice of the modified nanosheets and the presence of crown-ether addends, respectively. Finally, B15C5-MoS2 electrodes were constructed and evaluated as ion-selective electrodes for sodium ions in aqueous solution and an artificial sweat matrix.

    DOI: 10.1039/d1nr00404b

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  23. Femtosecond photoluminescence from monolayer MoS2: Time-domain study on exciton diffusion

    Kensuke Saito, Mitsuhiro Okada, Ryo Kitaura, Hideo Kishida, Takeshi Koyama

    PHYSICAL REVIEW B   Vol. 103 ( 20 )   2021.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    Transition metal dichalcogenides are expected to be used in transparent, flexible, and highly efficient light-emitting devices. Exciton diffusion is a key factor in device applications. In this study, we measured the photoluminescence (PL) decay of excitons in a MoS2 monolayer synthesized by chemical vapor deposition on a sapphire substrate. The PL decay of A and B excitons in the femtosecond regime was observed. The PL decay curves were analyzed based on a model of exciton trapping at the deactivation center via diffusion, and the diffusion time until trapping was obtained. The diffusion coefficient and the corresponding exciton mobility were also determined. This study demonstrates the two-dimensional exciton diffusion in the femtosecond regime in the MoS2 monolayer.

    DOI: 10.1103/PhysRevB.103.L201401

    Web of Science

  24. Unveiling the Photoinduced Electron-Donating Character of MoS2 in Covalently Linked Hybrids Featuring Perylenediimide

    Ioanna K. Sideri, Youngwoo Jang, Jose Garces-Garces, Angela Sastre-Santos, Ruben Canton-Vitoria, Ryo Kitaura, Fernando Fernandez-Lazaro, Francis D'Souza, Nikos Tagmatarchis

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 60 ( 16 ) page: 9120 - 9126   2021.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    The covalent functionalization of MoS2 with a perylenediimide (PDI) is reported and the study is accompanied by detailed characterization of the newly prepared MoS2-PDI hybrid material. Covalently functionalized MoS2 interfacing organic photoactive species has shown electron and/or energy accepting, energy reflecting or bi-directional electron accepting features. Herein, a rationally designed PDI, unsubstituted at the perylene core to act as electron acceptor, forces MoS2 to fully demonstrate for the first time its electron donor capabilities. The photophysical response of MoS2-PDI is visualized in an energy-level diagram, while femtosecond transient absorption studies disclose the formation of MoS2.+-PDI.- charge separated state. The tunable electronic properties of MoS2, as a result of covalently linking photoactive organic species with precise characteristics, unlock their potentiality and enable their application in light-harvesting and optoelectronic devices.

    DOI: 10.1002/anie.202016249

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    PubMed

  25. Microscopic mechanism of van der Waals heteroepitaxy in the formation of MoS2/hBN vertical heterostructures International journal

    Mitsuhiro Okada, Mina Maruyama, Susumu Okada, Jamie H. Warner, Yusuke Kureishi, Yosuke Uchiyama, Takashi Taniguchi, Kenji Watanabe, Tetsuo Shimizu, Toshitaka Kubo, Hisanori Shinohara, Ryo Kitaura

    ACS OMEGA   Vol. 5 ( 49 ) page: 31692 - 31699   2020.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Recent works have revealed that van der Waals (vdW) epitaxial growth of 2D
    materials on crystalline substrates, such as hexagonal boron nitride (hBN),
    leads to formation of self-aligned grains, which results in defect-free
    stitching between the grains. However, how the weak vdW interaction causes
    strong limitation on orientation of grains is still not understood yet. In this
    work, we have focused on investigation of mechanism of self-alignment of MoS2
    grains in vdW epitaxial growth on hBN. Through calculation based on density
    functional theory and the Lennard-Jones potential, we found that interaction
    energy between MoS2 and hBN strongly depends both on size and orientation of
    MoS2. We also found that, when size of MoS2 is ca. 40 nm, rotational energy
    barrier can exceed ~ 1 eV, which should suppress rotation to limit orientation
    of MoS2 even at growth temperature.

    DOI: 10.1021/acsomega.0c04168

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    arXiv

    Other Link: http://arxiv.org/pdf/2004.13260v2

  26. Dark-state impact on the exciton recombination of WS2 monolayers as revealed by multi-time-scale pump-and-probe spectroscopy

    Takashi Kuroda, Yusuke Hoshi, Satoru Masubuchi, Mitsuhiro Okada, Ryo Kitaura, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida

    PHYSICAL REVIEW B   Vol. 102 ( 19 )   2020.11

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    The luminescence yield of transition metal dichalcogenide monolayers
    frequently suffers from the formation of long-lived dark states, which include
    excitons with intervalley charge carriers, spin-forbidden transitions, and a
    large center-of-mass momentum located outside the light cone of dispersion
    relations. Efficient relaxation from bright exciton states to dark states
    suppresses the quantum yield of photon emission. In addition, the radiative
    recombination of excitons is heavily influenced by Auger-type exciton-exciton
    scattering, which yields another nonradiative relaxation channel at room
    temperature. Here, we show that Auger-type scattering is promoted not only
    between (bright) excitons but also between excitons and long-lived dark states.
    We studied the luminescence dynamics of monolayer WS2 capped with hexagonal BN
    over broad time ranges of picoseconds to milliseconds using carefully designed
    pump-and-probe techniques. We observed that luminescence quenching associated
    with Auger-type scattering occurs on 1-100 microsecond time scales, which thus
    correspond to the lifetimes of the relevant dark states. The broad distribution
    of the measured lifetimes implies the impact of various types of long-lived
    states on the exciton annihilation process.

    DOI: 10.1103/PhysRevB.102.195407

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    Other Link: http://arxiv.org/pdf/2010.10701v1

  27. Direct Observation of Molecular Orbitals Using Synchrotron X-ray Diffraction

    Shunsuke Kitou, Yuto Hosogi, Ryo Kitaura, Toshio Naito, Toshikazu Nakamura, Hiroshi Sawa

    CRYSTALS   Vol. 10 ( 11 ) page: 1 - 14   2020.11

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    The physical properties of molecular crystals are governed by the frontier orbitals of molecules. A molecular orbital, which is formed by superposing the atomic orbitals of constituent elements, has complicated degrees of freedom in the crystal because of the influence of electron correlation and crystal field. Therefore, in general, it is difficult to experimentally observe the whole picture of a frontier orbital. Here, we introduce a new method called "core differential Fourier synthesis" (CDFS) using synchrotron X-ray diffraction to observe the valence electron density in materials. By observing the valence electrons occupied in molecular orbitals, the orbital state can be directly determined in a real space. In this study, we applied the CDFS method to molecular materials such as diamond, C-60 fullerene, (MV)I-2, and (TMTTF)(2)X. Our results not only demonstrate the typical orbital states in some materials, but also provide a new method for studying intramolecular degrees of freedom.

    DOI: 10.3390/cryst10110998

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  28. Autism-associated variants of neuroligin 4X impair synaptogenic activity by various molecular mechanisms.

    Yumoto T, Kimura M, Nagatomo R, Sato T, Utsunomiya S, Aoki N, Kitaura M, Takahashi K, Takemoto H, Watanabe H, Okano H, Yoshida F, Nao Y, Tomita T

    Molecular autism   Vol. 11 ( 1 ) page: 68   2020.9

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    DOI: 10.1186/s13229-020-00373-y

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  29. Stabilization of metallic phases through formation of metallic/semiconducting lateral heterostructures International journal

    Ruben Canton-Vitoria, Takato Hotta, Zheng Liu, Tsukasa Inoue, Ryo Kitaura

    JOURNAL OF CHEMICAL PHYSICS   Vol. 153 ( 8 ) page: 084702 - 084702   2020.8

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    In this study, we develop a new approach for stabilization of metallic phases of monolayer MoS2 through the formation of lateral heterostructures composed of semiconducting/metallic MoS2. The structure of metallic (a mixture of T and T ') and semiconducting (2H) phases was unambiguously characterized by Raman spectroscopy, x-ray photoelectron spectroscopy, photoluminescence imaging, and transmission electron microscope observations. The amount of NaCl, reaction temperature, reaction time, and locations of substrates are essential for controlling the percentage of metallic/semiconducting phases in lateral heterostructures; loading a large amount of NaCl at low temperatures with short reaction times prefers metallic phases. The existence of the semiconducting phase in MoS2 lateral heterostructures significantly enhances the stability of the metallic phases through passivation of reactive edges. The same approach can be applied to other transition metal dichalcogenides (TMDs), such as WS2, leading to boosting of basic research and application of TMDs in metallic phases.

    DOI: 10.1063/5.0012782

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  30. Low frequency Raman study of interlayer couplings in WS2-MoS2 van der Waals heterostructures

    Yuika Saito, Takahiro Kondo, Hiroki Ito, Mitsuhiro Okada, Tetsuo Shimizu, Toshitaka Kubo, Ryo Kitaura

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( 6 )   2020.6

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    Interlayer coupling in WS2-MoS2 van der Waals heterostructures was studied using low-frequency resonance Raman spectroscopy. The relationship between high-frequency Raman modes and a low-frequency Raman mode were investigated. The Raman intensity of interlayer shear-mode exhibited a linear correlation with the intensity of the two modes A(1g) and E-2g(1). The frequency difference between these two modes, A(1g)-E-2g(1), was also investigated. Microscopic measurements showed that the intensity ratio A(1g)/E-2g(1) is sensitively modulated by the spatially non-uniform electronic potential. On the other hand, A(1g)-E-2g(1) is stable and is determined by the number of layers and layer stacking configurations. Therefore, both parameters can be used independently to discuss the quality of vdW heterostructures. Our findings provide convenient markers for studying interlayer coupling of vdW heterostructures using Raman spectroscopy.

    DOI: 10.35848/1347-4065/ab9400

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  31. Reply to Comment on Watanabe, A.; Kadota, Y.; Yokoyama, H.; Tsuruda, S.; Kamio, R.; Tochio, T.; Shimomura, Y.; Kitaura, Y. Experimental Determination of the Threshold Dose for Bifidogenic Activity of Dietary 1-Kestose in Rats. <i>Foods</i> 2020, <i>9</i>, 4.

    Watanabe A, Kadota Y, Tochio T, Shimomura Y, Kitaura Y

    Foods (Basel, Switzerland)   Vol. 9 ( 4 )   2020.4

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    DOI: 10.3390/foods9040527

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  32. Salt-assisted pyrolysis of covalent organic frameworks to porous heteroatom-doped carbons for supercapacitive energy storage

    Dongwan Yan, Yang Wu, Ryo Kitaura, Kunio Awaga

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 7 ( 47 ) page: 26829 - 26837   2019.12

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    Supercapacitors have attracted intensive research interest due to their advantages including longer cycling ability and higher power density. Porous heteroatom-doped carbons (PHCs) have been regarded as a class of promising electrode materials for supercapacitors because of their unique porous, electronic and chemical properties. However, synthesis of PHCs with hierarchical mesoporous/microporous structures and ultra-high porosity and electrochemical performance remains a great research challenge. In this research, two oxygen and nitrogen co-doped PHCs (denoted as ONC-T1s) are prepared via a saltassisted pyrolysis method using covalent organic frameworks (COFs) as the precursor. ONC-T1s show a hierarchical porous structure with an ultra-high specific surface area (up to 3451 m(2) g(-1)). The ONC-T1-850-based supercapacitor exhibits a high specific capacitance of 1711 F g(-1) at 1 A g(1), an ultra-fast charge-discharge rate up to 500 A g(-1) with a specific capacitance of 856 F g(-1), and excellent stability. This work establishes a promising strategy for preparation of PHCs using COFs or other porous organic polymers as precursors and demonstrates the great potential of PHC-based supercapacitors.

    DOI: 10.1039/c9ta05150c

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  33. Momentum-forbidden dark excitons in hBN-encapsulated monolayer MoS2

    Yosuke Uchiyama, Alex Kutana, Kenji Watanabe, Takashi Taniguchi, Kana Kojima, Takahiko Endo, Yasumitsu Miyata, Hisanori Shinohara, Ryo Kitaura

    NPJ 2D MATERIALS AND APPLICATIONS   Vol. 3 ( 1 ) page: 1 - 6   2019.7

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    Encapsulation by hexagonal boron nitride (hBN) has been widely used to address intrinsic properties of two-dimensional (2D) materials. The hBN encapsulation, however, can alter properties of 2D materials through interlayer orbital hybridization. In this paper, we present measurements of temperature dependence of photoluminescence intensity from monolayer MoS2 encapsulated by hBN flakes. The obtained temperature dependence shows an opposite trend to that of previously observed in a monolayer MoS2 on a SiO2 substrate. This is caused by the existence of stable momentum-forbidden dark excitons in the hBN-encapsulated MoS2. Ab-initio band-structure calculations have shown that orbital hybridization between MoS2 and hBN leads to upward shift of G-valley of MoS2, which results in lowering of energy of the momentum-forbidden dark excitons. This work shows an important implication that the hBN-encapsulated structures used to address intrinsic properties of two-dimensional crystals can alter basic properties of encapsulated materials.

    DOI: 10.1038/s41699-019-0108-4

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  34. Exciton Diffusion in hBN-encapsulated Monolayer MoSe<inf>2</inf>

    Hotta T.

    2019 Compound Semiconductor Week, CSW 2019 - Proceedings     2019.5

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    DOI: 10.1109/ICIPRM.2019.8819120

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  35. Two Dimensional Film Printing by Blister-Based Laser-Induced Forward-Transfer

    Goodfriend Nathan T., Nerushev Oleg, Xu Wenshuo, Okada Mitsuhiro, Kitaura Ryo, Warner James, Shinohara H., Bulgakov Alexander V., Campbell Eleanor, Bulgakova Nadezhda M.

    2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)     page: .   2019

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  36. Exciton Diffusion in hBN-encapsulated Monolayer MoSe2

    Hotta Takato, Higuchi Syohei, Uchiyama Yosuke, Ueno Keiji, Watanabe Kenji, Taniguchi Takashi, Shinohara Hisanori, Kitaura Ryo

    2019 COMPOUND SEMICONDUCTOR WEEK (CSW)     2019

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  37. Molecular-beam-epitaxy Growth of Two-dimensional Layered Materials

    KITAURA Ryo

    Vacuum and Surface Science   Vol. 62 ( 10 ) page: 605 - 610   2019

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    <p>Two-dimensional (2D) materials, including graphene, hexagonal boron nitrides, transition metal dichalcogenides (TMDs), and their heterostructures, have recently attracted a great deal of attention. Various 2D materials can respond to external stimuli differently, which leads to novel physical properties and possible high-performance device applications. To push forward the 2D-material-based science and technology, application of advanced thin-film growth techniques, such as molecular beam epitaxy, is indispensable. In this paper, I focus on the present status and future prospects of MBE growth of TMDs.</p>

    DOI: 10.1380/vss.62.605

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  38. Two dimensional film printing by blister-based laser-induced forward-transfer

    Nathan T. Goodfriend, Oleg Nerushev, Wenshuo Xu, Mitsuhiro Okada, Ryo Kitaura, James Warner, H. Shinohara, Alexander V. Bulgakov, Eleanor Campbell, Nadezhda M. Bulgakova

    Optics InfoBase Conference Papers   Vol. Part F129-CLEO_SI 2019   2019

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    © 2019 The Author(s) An investigation into the feasibility of using ultrashort laser pulses to induce deformations on a donor film coated in 2 dimensional materials as a printing technique for the contactless and impurity-free fabrication of devices based on these materials.

    DOI: 10.1364/CLEO_SI.2019.SF2G.2

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  39. Systematic Study of Photoluminescence Enhancement in Monolayer Molybdenum Disulfide by Acid Treatment Reviewed International journal

    Daisuke Kiriya, Yuh Hijikata, Jenny Pirillo, Ryo Kitaura, Akihiko Murai, Atsushi Ashida, Takeshi Yoshimura, Norifumi Fujimura

    Langmuir   Vol. 34 ( 35 ) page: 10243 - 10249   2018.9

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    Copyright © 2018 American Chemical Society. Monolayer molybdenum disulfide (MoS2) is an atomically thin semiconducting material with a direct band gap. This physical property is attributable to atomically thin optical devices such as sensors, light-emitting devices, and photovoltaic cells. Recently, a near-unity photoluminescence (PL) quantum yield of a monolayer MoS2 was demonstrated via a treatment with a molecular acid, bis(trifluoromethane)sulfonimide (TFSI); however, the mechanism still remains a mystery. Here, we work on PL enhancement of monolayer MoS2 by treatment of Brønsted acids (TFSI and sulfuric acid (H2SO4)) to identify the importance of the protonated environment. In TFSI as an acid, different solvents - 1,2-dichloroethane (DCE), acetonitrile, and water - were studied, as they show quite different acidity in solution. All of the solvents showed PL enhancement, and the highest was observed in DCE. This behavior in DCE would be due to the higher acidity than others have. Acids from different anions can also be studied in water as a common solvent. Both TFSI and H2SO4 showed similar PL enhancement (∼4-8 enhancement) at the same proton concentration, indicating that the proton is a key factor to enhance the PL intensity. Finally, we considered another cation, Li+ from Li2SO4, instead of H2SO4, in water. Although Li and H atoms showed similar binding energy on MoS2 from theoretical calculations, Li2SO4 treatment showed little PL enhancement; only coexisting H2SO4 reproduced the enhancement. This study demonstrated the importance of a protonated environment to increase the PL intensity of monolayer MoS2. The study will lead to a solution to achieve high optical quality and to implementation for atomically thin optical devices.

    DOI: 10.1021/acs.langmuir.8b01425

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  40. Blister-based-laser-induced-forward-transfer: A non-contact, dry laser-based transfer method for nanomaterials Reviewed

    N. T. Goodfriend, S. Y. Heng, O. A. Nerushev, A. V. Gromov, A. V. Bulgakov, M. Okada, W. Xu, R. Kitaura, J. Warner, H. Shinohara, E. E.B. Campbell

    Nanotechnology   Vol. 29 ( 38 )   2018.7

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    © 2018 IOP Publishing Ltd. We show that blister-based-laser-induced forward-transfer can be used to cleanly desorb and transfer nano- and micro-scale particles between substrates without exposing the particles to the laser radiation or to any chemical treatment that could damage the intrinsic electronic and optical properties of the materials. The technique uses laser pulses to induce the rapid formation of a blister on a thin metal layer deposited on glass via ablation at the metal/glass interface. Femtosecond laser pulses are advantageous for forming beams of molecules or small nanoparticles with well-defined velocity and narrow angular distributions. Both fs and ns laser pulses can be used to cleanly transfer larger nanoparticles including relatively fragile monolayer 2D transition metal dichalcogenide crystals and for direct transfer of nanoparticles from chemical vapour deposition growth substrates, although the mechanisms for inducing blister formation are different.

    DOI: 10.1088/1361-6528/aaceda

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  41. Effect of a pick-and-drop process on optical properties of a CVD-grown monolayer tungsten disulfide Reviewed

    Yusuke Hoshi, Mitsuhiro Okada, Rai Moriya, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Ryo Kitaura, Tomoki Machida

    Physical Review Materials   Vol. 2 ( 6 )   2018.6

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    © 2018 American Physical Society. We systematically investigated changes of a photoluminescence (PL) spectral shape by picking a tungsten disulfide monolayer (1L-WS2) grown on a sapphire (SA) substrate and dropping it on various substrates such as SA, SiO2, and hexagonal boron nitride (hBN). An inhomogeneous contribution to the exciton PL linewidth was reduced by picking the CVD-grown 1L-WS2, meaning potential energy disorder lowering in the 1L-WS2. In addition, a defect-bound exciton peak was not seen at low temperature for all the samples with the pick-and-drop process although it was clearly observed for the as-grown sample. It was thought that the as-grown 1L-WS2 was covalently bonded on the SA substrate surface due to the existence of crystal imperfections in the WS2 and the covalent bonds formed midgap states. A PL spectrum had to be carefully treated in order to fairly evaluate a crystal quality in a CVD-grown 1L-WS2 since PL spectral shapes were determined by complexes of the defect density with other mechanisms such as strain fluctuation and a connection with the substrate.

    DOI: 10.1103/PhysRevMaterials.2.064003

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  42. Extended-conjugation π-electron systems in carbon nanotubes Reviewed International journal

    Kenshi Miyaura, Yasumitsu Miyata, Boanerges Thendie, Kazuhiro Yanagi, Ryo Kitaura, Yuta Yamamoto, Shigeo Arai, Hiromichi Kataura, Hisanori Shinohara

    Scientific Reports   Vol. 8 ( 1 ) page: 8098 - 8098   2018.5

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    © 2018 The Author(s). Extending π-electron systems are among the most important topics in physics, chemistry and materials science because they can result in functional materials with applications in electronics and optics. Conventional processes for π-electron extension, however, can generate products exhibiting chemical instability, poor solubility or disordered structures. Herein, we report a novel strategy for the synthesis of π-conjugated polymers within the interiors of carbon nanotubes (CNTs). In this process, thiophene-based oligomers are encapsulated within CNTs as precursors and are subsequently polymerized by thermal annealing. This polymerization increases the effective conjugation length of the thiophenes, as confirmed by transmission electron microscopy and absorption peak red shifts. This work also demonstrates that these polythiophenes can serve as effective markers for individual CNTs during Raman imaging with single-wavelength laser excitation due to their strong absorbance. In addition, stable carrier injection into the encapsulated polythiophenes is found to be possible via electrochemical doping. Such doping has the potential to produce π-electron-based one-dimensional conductive wires and highly stable electrochromic devices.

    DOI: 10.1038/s41598-018-26379-4

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  43. Development of a new knock-in mouse model and evaluation of pharmacological activities of lusutrombopag, a novel, nonpeptidyl small-molecule agonist of the human thrombopoietin receptor c-Mpl.

    Yoshida H, Yamada H, Nogami W, Dohi K, Kurino-Yamada T, Sugiyama K, Takahashi K, Gahara Y, Kitaura M, Hasegawa M, Oshima I, Kuwabara K

    Experimental hematology   Vol. 59   page: 30 - 39.e2   2018.3

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    DOI: 10.1016/j.exphem.2017.12.005

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  44. Exciton Diffusion in a hBN-encapsulated Monolayer Transition Metal Dichalcogenide

    Takato Hotta, Shohei Higuchi, Yosuke Uchiyama, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    Optics InfoBase Conference Papers   Vol. Part F125-JSAP 2018   2018

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    © 2018 OSA - The Optical Society. All rights reserved. Excitons are bound states of an electron and a hole through Coulomb interaction. Optical responses from low-dimensional systems, such as transition metal dichal-cogenides (TMDs), is dominated by the excitonic effect even at room temperature, and exciton diffusion is one of the most important processes for understanding optical response of TMDs. To address intrinsic exciton diffusion in TMDs, extrinsic effects, such as substrate effects, need to be suppressed. In this work, we have conducted systematic investigations of exciton diffusion in a hBN-encapsulated monolayer MoSe2.

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  45. Exciton Diffusion in a hBN-encapsulated Monolayer Transition Metal Dichalcogenide

    Hotta T.

    Optics InfoBase Conference Papers   Vol. Part F125-JSAP 2018   2018

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  46. Femtosecond Laser Filamentation in Gaseous Ethylene: Formation of Hydrogenated Amorphous Carbon Reviewed

    Matsuda Akitaka, Hayashi Takahiro, Kitaura Ryo, Hishikawa Akiyoshi

    CHEMISTRY LETTERS   Vol. 46 ( 9 ) page: 1426 - 1429   2017.9

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    DOI: 10.1246/cl.170613

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  47. Modulation of the Local Density of States of Carbon Nanotubes by Encapsulation of Europium Nanowires As Observed by Scanning Tunneling Microscopy and Spectroscopy Reviewed

    Terunobu Nakanishi, Ryo Kitaura, Takazumi Kawai, Susumu Okada, Shoji Yoshida, Osamu Takeuchi, Hidemi Shigekawa, Hisanori Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 121 ( 33 ) page: 18195 - 18201   2017.8

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    Modulation of the local density of states of single-wall carbon nanotubes (SWCNTs) is induced by the encapsulation of europium nanowires (EuNWs). The observation of these modulated density of states using scanning tunneling microscopy/spectroscopy combined with density functional theory calculations is reported. The electronic modulation of SWCNTs by encapsulation of EuNWs is revealed as a Fermi level: shift, band gap reduction) and the emergence, of localized states in the gap. The present results show that the electronic interaction between EuNWs and SWCNTs is much stronger than that previously reported for nanomaterials encapsulated in SWCNTs.

    DOI: 10.1021/acs.jpcc.7b04047

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  48. Fexofenadine Suppresses Delayed-Type Hypersensitivity in the Murine Model of Palladium Allergy.

    Matsubara R, Kumagai K, Shigematsu H, Kitaura K, Nakasone Y, Suzuki S, Hamada Y, Suzuki R

    International journal of molecular sciences   Vol. 18 ( 7 )   2017.6

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    DOI: 10.3390/ijms18071357

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  49. Suppression of exciton-exciton annihilation in tungsten disulfide monolayers encapsulated by hexagonal boron nitrides Reviewed

    Yusuke Hoshi, Takashi Kuroda, Mitsuhiro Okada, Rai Moriya, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Ryo Kitaura, Tomoki Machida

    PHYSICAL REVIEW B   Vol. 95 ( 24 )   2017.6

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    We investigates exciton-exciton annihilation (EEA) in tungsten disulfide (WS2) monolayers encapsulated by hexagonal boron nitride (hBN). It is revealed that decay signals observed by time-resolved photoluminescence (PL) are not strongly dependent on the exciton densities of hBN-encapsulated WS2 monolayers (WS2/hBN). In contrast, the sample without the bottom hBN layer (WS2/SiO2) exhibits a drastic decrease of decay time with increasing exciton density due to the appearance of a rapid PL decay component, signifying nonradiative EEA-mediated recombination. Furthermore, the EEA rate constant of WS2/hBN was determined as (6.3 +/- 1.7) x 10(-3) cm(2) s(-1), being about 2 orders of magnitude smaller than that of WS2/SiO2. Thus, the observed EEA rate reduction played a key role in enhancing luminescence intensity at high exciton densities in the WS2 monolayer.

    DOI: 10.1103/PhysRevB.95.241403

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  50. Orientation-controlled growth of hexagonal boron nitride monolayers templated from graphene edges Reviewed

    Eriko Maeda, Yasumitsu Miyata, Hiroki Hibino, Yu Kobayashi, Ryo Kitaura, Hisanori Shinohara

    APPLIED PHYSICS EXPRESS   Vol. 10 ( 5 )   2017.5

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    The crystal orientation of epitaxially grown hexagonal boron nitride (hBN) monolayers from graphene edges was investigated. Low-energy electron microscopy observations reveal that the orientation of individual hBN grains is dependent on the direction of the templated zigzag edges of graphene. Furthermore, the triangular atomic defects in hBN were used to confirm the orientation of epitaxial hBN through high-resolution transmission electron microscopy observations. The results indicate that the orientation of epitaxially grown hBN is determined by the formation of carbon-boron bonds at the graphene/hBN interface, which provides a promising way of producing uniform interface structures and orientation-controlled hBN grains. (C) 2017 The Japan Society of Applied Physics

    DOI: 10.7567/APEX.10.055102

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  51. Observation of biexcitonic emission at extremely low power density in tungsten disulfide atomic layers grown on hexagonal boron nitride Reviewed International journal

    Mitsuhiro Okada, Yuhei Miyauchi, Kazunari Matsuda, Takashi Taniguchi, Kenji Watanabe, Hisanori Shinohara, Ryo Kitaura

    Scientific Reports   Vol. 7 ( 1 ) page: 322 - 322   2017.3

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    © The Author(s) 2017. Monolayer transition metal dichalcogenides (TMDCs) including WS2, MoS2, WSe2 and WS2, are two-dimensional semiconductors with direct bandgap, providing an excellent field for exploration of many-body effects in 2-dimensions (2D) through optical measurements. To fully explore the physics of TMDCs, the prerequisite is preparation of high-quality samples to observe their intrinsic properties. For this purpose, we have focused on high-quality samples, WS2 grown by chemical vapor deposition method with hexagonal boron nitride as substrates. We observed sharp exciton emissions, whose linewidth is typically 22∼23 meV, in photoluminescence spectra at room temperature, which result clearly demonstrates the high-quality of the current samples. We found that biexcitons formed with extremely low-excitation power (240 W/cm2) at 80 K, and this should originate from the minimal amount of localization centers in the present high-quality samples. The results clearly demonstrate that the present samples can provide an excellent field, where one can observe various excitonic states, offering possibility of exploring optical physics in 2D and finding new condensates.

    DOI: 10.1038/s41598-017-00068-0

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  52. Layered heterostructures based on transition metal dichalcogenides and hexagonal boron nitride

    KITAURA Ryo

    Oyo Buturi   Vol. 86 ( 3 ) page: 204 - 208   2017

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    <p>Transition metal dichalcogenides (TMD) are three-atom-thick atomic layers, which have been attracting a great deal of attention. In this report, recent results on chemical vapor deposition and molecular beam epitaxy growth of high-quality heterostructures of TMD and hexagonal boron nitride are introduced.</p>

    DOI: 10.11470/oubutsu.86.3_204

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  53. Molecular beam epitaxy growth of monolayer niobium diselenide flakes Reviewed

    Takato Hotta, Takuto Tokuda, Sihan Zhao, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    APPLIED PHYSICS LETTERS   Vol. 109 ( 13 )   2016.9

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    Monolayer niobium diselenide (NbSe2) is prepared through molecular beam epitaxy with hexagonal boron nitride (hBN) as substrates. Atomic force microscopy and the Raman spectroscopy have shown that the monolayer NbSe2 grown on the hBN possesses triangular or truncated triangular shape whose lateral size amounts up to several hundreds of nanometers. We have found that the precisely controlled supply rate and ultraflat surface of hBN plays an important role in the growth of the monolayer NbSe2. Published by AIP Publishing.

    DOI: 10.1063/1.4963178

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  54. Simple fabrication of air-stable black phosphorus heterostructures with large-area hBN sheets grown by chemical vapor deposition method Reviewed

    Sapna Sinha, Yuya Takabayashi, Hisanori Shinohara, Ryo Kitaura

    2D MATERIALS   Vol. 3 ( 3 )   2016.9

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    We have developed a facile and general method to passivate thin black phosphorus (BP) flakes with large-area high-quality monolayer hexagonal boron nitride (hBN) sheets grown by the chemical vapor deposition (CVD) method. In spite of the one-atom-thick structure, the high-quality CVD-grown monolayer hBN has proven to be useful to prevent the degradation of thin BP flakes exfoliated on substrates. Mechanically exfoliated BP flakes prepared on a Si substrate are covered by the monolayer hBN sheet to preserve (otherwise unstable) atomic layered BP flakes from degradation. The present technique can generally be applied to fabricating BP-based electronic devices with much easiness.

    DOI: 10.1088/2053-1583/3/3/035010

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  55. Overexpression of ErbB4 is an independent marker for lymph node metastasis in Japanese patients with oral squamous cell carcinoma.

    Ohashi Y, Kumagai K, Miyata Y, Matsubara R, Kitaura K, Suzuki S, Hamada Y, Suzuki R

    Oral surgery, oral medicine, oral pathology and oral radiology   Vol. 122 ( 3 ) page: 313 - 21   2016.9

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    DOI: 10.1016/j.oooo.2016.04.017

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  56. Construction of Covalent Organic Nanotubes by Light-Induced Cross-Linking of Diacetylene-Based Helical Polymers. Reviewed International journal

    Kaho Maeda, Liu Hong, Taishi Nishihara, Yusuke Nakanishi, Yuhei Miyauchi, Ryo Kitaura, Naoki Ousaka, Eiji Yashima, Hideto Ito, Kenichiro Itami

    Journal of the American Chemical Society   Vol. 138 ( 34 ) page: 11001 - 11008   2016.8

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    Organic nanotubes (ONTs) are tubular nanostructures composed of small molecules or macromolecules that have found various applications including ion sensor/channels, gas absorption, and photovoltaics. While most ONTs are constructed by self-assembly processes based on weak noncovalent interactions, this unique property gives rise to the inherent instability of their tubular structures. Herein, we report a simple "helix-to-tube" strategy to construct robust, covalent ONTs from easily accessible poly(m-phenylene diethynylene)s (poly-PDEs) possessing chiral amide side chains that can adopt a helical conformation through hydrogen-bonding interactions. The helically folded poly-PDEs subsequently undergo light-induced cross-linking at longitudinally aligned 1,3-butadiyne moieties across the whole helix to form covalent tubes (ONTs) both in solution and solid phases. The structures of poly-PDEs and covalent ONTs were characterized by spectroscopic analyses, diffraction analysis, and microscopic analyses. We envisage that this simple yet powerful "helix-to-tube" strategy will generate a range of ONT-based materials by introducing functional moieties into a monomer.

    DOI: 10.1021/jacs.6b05582

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  57. Origin of residual particles on transferred graphene grown by CVD Reviewed

    Tomohiro Yasunishi, Yuya Takabayashi, Shigeru Kishimoto, Ryo Kitaura, Hisanori Shinohara, Yutaka Ohno

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 55 ( 8 )   2016.8

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    Large-area single-layer graphene can be grown on Cu foil by CVD, but for device applications, the layer must to be transferred onto an insulating substrate. As residual particles are often observed on transferred graphene, we investigated their origin using scanning electron microscopy and energy-dispersive X-ray spectrometry (EDX). The results show that these residual particles are composed either of silicon or an alloy of a few metals, and hence, likely originate from the quartz tube of the CVD furnace and the impurities contained in the Cu foil. (C) 2016 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.55.080305

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  58. Two-dimensional metallic NbS2: growth, optical identification and transport properties Reviewed

    Sihan Zhao, Takato Hotta, Takashi Koretsune, Kenji Watanabe, Takashi Taniguchi, Katsuaki Sugawara, Takashi Takahashi, Hisanori Shinohara, Ryo Kitaura

    2D MATERIALS   Vol. 3 ( 2 )   2016.6

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    Progress on researches of two-dimensional (2D) metals strongly relies on development of the growth technique. Studies on preparation of 2D metals have so far been limited, and this is in stark contrast to the situation of 2D semiconductors, where various layered semiconductors, including MoS2, WS2, MoSe2, WSe2, have been isolated in its monolayer form. In this work, we have developed a facile method to prepare 2D metallic transition metal dichalcogenides (TMDCs) by chemical vapor deposition (CVD) method, where direct growth of few-layered NbS2 (3R phase) on atomically flat hexagonal boron nitride (hBN) has been demonstrated. Structural characterization of the so-grown NbS2 was performed with atomic force microscopy, optical microscopy, electron microscopy and optical spectroscopy, revealing that the utilization of hBN as growth substrates is a key factor for the first successful CVD growth of 2D metallic TMDCs with large single-domain size (several mu m). Electrical transport measurements have clearly shown that NbS2 atomic layers down to few-layer-thickness are metal. The current study opens up a new synthetic route for controllable growth of 2D layered metallic materials, which is of great importance in study of rich physics in 2D metals, as well as in search for novel 2D superconductors.

    DOI: 10.1088/2053-1583/3/2/025027

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  59. Efficient preparation of graphene liquid cell utilizing direct transfer with large-area well-stitched graphene Reviewed

    Yuki Sasaki, Ryo Kitaura, Jong Min Yuk, Alex Zettl, Hisanori Shinohara

    CHEMICAL PHYSICS LETTERS   Vol. 650   page: 107 - 112   2016.4

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    By utilizing graphene-sandwiched structures recently developed in this laboratory, we are able to visualize small droplets of liquids in nanometer scale. We have found that small water droplets as small as several tens of nanometers sandwiched by two single-layer graphene are frequently observed by TEM. Due to the electron beam irradiation during the TEM observation, these sandwiched droplets are frequently moving from one place to another and are subjected to create small bubbles inside. The synthesis of a large area single-domain graphene of high-quality is essential to prepare the graphene sandwiched cell which safely encapsulates the droplets in nanometer size. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2016.02.066

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  60. Importance of Three-Body Interactions in Molecular Dynamics Simulations of Water Demonstrated with the Fragment Molecular Orbital Method.

    Pruitt SR, Nakata H, Nagata T, Mayes M, Alexeev Y, Fletcher G, Fedorov DG, Kitaura K, Gordon MS

    Journal of chemical theory and computation   Vol. 12 ( 4 ) page: 1423 - 35   2016.4

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    DOI: 10.1021/acs.jctc.5b01208

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  61. Possible Immune Regulation of Natural Killer T Cells in a Murine Model of Metal Ion-Induced Allergic Contact Dermatitis.

    Kumagai K, Horikawa T, Shigematsu H, Matsubara R, Kitaura K, Eguchi T, Kobayashi H, Nakasone Y, Sato K, Yamada H, Suzuki S, Hamada Y, Suzuki R

    International journal of molecular sciences   Vol. 17 ( 1 )   2016.1

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    DOI: 10.3390/ijms17010087

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  62. Isolation and Structure Determination of a Missing Endohedral Fullerene La@C-70 through In Situ Trifluoromethylation Reviewed International journal

    Zhiyong Wang, Shinobu Aoyagi, Haruka Omachi, Ryo Kitaura, Hisanori Shinohara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 55 ( 1 ) page: 199 - 202   2016.1

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    D-5h-symmetric fullerene C-70 (D-5h-C-70) is one of the most abundant members of the fullerene family. One longstanding mystery in the field of fullerene chemistry is whether D-5h-C-70 is capable of accommodating a rare-earth metal atom to form an endohedral metallofullerene M@ D-5h-C-70, which would be expected to show novel electronic properties. The molecular structure of La@C-70 remains unresolved since its discovery three decades ago because of its extremely high instability under ambient conditions and insolubility in organic solvents. Herein, we report the single-crystal X-ray structure of La@C-70(CF3)(3), which was obtained through in situ exohedral functionalization by means of trifluoromethylation. The X-ray crystallographic study reveals that La@C-70(CF3)(3) is the first example of an endohedral rare-earth fullerene based on D5hC70. The dramatically enhanced stability of La@C-70(CF3)(3) compared to La@C-70 can be ascribed to trifluoromethylationinduced bandgap enlargement.

    DOI: 10.1002/anie.201508082

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  63. Single atom spectroscopy: Decreased scattering delocalization at high energy losses, effects of atomic movement and X-ray fluorescence yield Reviewed International journal

    Luiz H. G. Tizei, Yoko Iizumi, Toshiya Okazaki, Ryo Nakanishi, Ryo Kitaura, Hisanori Shinohara, Kazu Suenaga

    ULTRAMICROSCOPY   Vol. 160   page: 239 - 246   2016.1

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    Single atom localization and identification is crucial in understanding effects which depend on the specific local environment of atoms. In advanced nanometer scale materials, the characteristics of individual atoms may play an important role. Here, we describe spectroscopic experiments (electron energy loss spectroscopy, EELS, and Energy Dispersed X-ray spectroscopy, EDX) using a low voltage transmission electron microscope designed towards single atom analysis. For EELS, we discuss the advantages of using lower primary electron energy (30 keV and 60 keV) and higher energy losses (above 800 eV). The effect of atomic movement is considered. Finally, we discuss the possibility of using atomically resolved EELS and EDX data to measure the fluorescence yield for X-ray emission. (C) 2015 Elsevier BY. All rights reserved.

    DOI: 10.1016/j.ultramic.2015.10.019

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  64. Fabrication and Characterization of hBN encapsulated Group-VI TMDC Heterostructure

    Okada Mitsuhiro, Watanabe Kenji, Taniguchi Takashi, Shinohara Hisanori, Kitaura Ryo

    Meeting Abstracts of the Physical Society of Japan   Vol. 71 ( 0 ) page: 1163 - 1163   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_1163

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  65. Chemical Vapor Deposition Growth of Graphene and Related Materials

    Kitaura Ryo, Miyata Yasumitsu, Xiang Rong, Hone James, Kong Jing, Ruoff Rodney S., Maruyama Shigeo

    Journal of the Physical Society of Japan   Vol. 84 ( 12 ) page: 121013 - 121013   2015.12

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  66. Chemical Vapor Deposition Growth of Graphene and Related Materials Reviewed

    Ryo Kitaura, Yasumitsu Miyata, Rong Xiang, James Hone, Jing Kong, Rodney S. Ruoff, Shigeo Maruyama

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 84 ( 12 )   2015.12

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    Research on atomic layers including graphene, hexagonal boron nitride (hBN), transition metal dichalcogenides (TMDCs) and their heterostructures has attracted a great deal of attention. Chemical vapor deposition (CVD) can provide large-area structure-defined high-quality atomic layer samples, which have considerably contributed to the recent advancement of atomic-layer research. In this article, we focus on the CVD growth of various atomic layers and review recent progresses including (1) the CVD growth of graphene using methane and ethanol as carbon sources, (2) the CVD growth of hBN using borazine and ammonia borane, (3) the CVD growth of various TMDCs using single and multi-furnace methods, and (4) CVD growth of vertical and lateral heterostructures such as graphene/hBN, MoS2/graphite, WS2/hBN and MoS2/WS2.

    DOI: 10.7566/JPSJ.84.121013

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  67. Template Synthesis of Linear-Chain Nanodiamonds Inside Carbon Nanotubes from Bridgehead-Halogenated Diamantane Precursors. Reviewed International journal

    Yusuke Nakanishi, Haruka Omachi, Natalie A Fokina, Peter R Schreiner, Ryo Kitaura, Jeremy E P Dahl, Robert M K Carlson, Hisanori Shinohara

    Angewandte Chemie (International ed. in English)   Vol. 54 ( 37 ) page: 10802 - 10806   2015.9

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    A simple method for the synthesis of linear-chain diamond-like nanomaterials, so-called diamantane polymers, is described. This synthetic approach is primarily based on a template reaction of dihalogen-substituted diamantane precursors in the hollow cavities of carbon nanotubes. Under high vacuum and in the presence of Fe nanocatalyst particles, the dehalogenated radical intermediates spontaneously form linear polymer chains within the carbon nanotubes. Transmission electron microscopy reveals the formation of well-aligned linear polymers. We expect that the present template-based approach will enable the synthesis of a diverse range of linear-chain polymers by choosing various precursor molecules. The present technique may offer a new strategy for the design and synthesis of one-dimensional nanomaterials.

    DOI: 10.1002/anie.201504904

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  68. Core-level spectroscopy to probe the oxidation state of single europium atoms. Reviewed International journal

    Luiz H G Tizei, Ryo Nakanishi, Ryo Kitaura, Hisanori Shinohara, Kazu Suenaga

    Physical review letters   Vol. 114 ( 19 ) page: 197602 - 197602   2015.5

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    The valence of individual europium atoms confined in carbon nanotubes is successfully measured by using core-level electron energy loss spectroscopy. Changes in the oxidation state at the atomic scale have been observed in Eu atomic chains exposed to oxygen. A transitory behavior has been identified where multiple atoms show a signal consistent with a sum of Eu^{2+} and Eu^{3+}. This indicates that single atoms change their valence state multiple times during the reaction, suggesting that oxidation in confined spaces and with extra energy input (from the electron beam) might not be a simple one step electron transfer event.

    DOI: 10.1103/PhysRevLett.114.197602

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  69. Fabrication and optical probing of highly extended, ultrathin graphene nanoribbons in carbon nanotubes. Reviewed International journal

    Hong En Lim, Yasumitsu Miyata, Miho Fujihara, Susumu Okada, Zheng Liu, Arifin, Kayoko Sato, Haruka Omachi, Ryo Kitaura, Stephan Irle, Kazu Suenaga, Hisanori Shinohara

    ACS nano   Vol. 9 ( 5 ) page: 5034 - 5040   2015.5

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    Nanotemplated growth of graphene nanoribbons (GNRs) inside carbon nanotubes is a promising mean to fabricate ultrathin ribbons with desired side edge configuration. We report the optical properties of the GNRs formed in single-wall carbon nanotubes. When coronene is used as the precursor, extended GNRs are grown via a high-temperature annealing at 700 °C. Their optical responses are probed through the diazonium-based side-wall functionalization, which effectively suppresses the excitonic absorption peaks of the nanotubes without damaging the inner GNRs. Differential absorption spectra clearly show two distinct peaks around 1.5 and 3.4 eV. These peaks are assigned to the optical transitions between the van Hove singularities in the density of state of the GNRs in qualitative agreement with the first-principles calculations. Resonance Raman spectra and transmission electron microscope observations also support the formation of long GNRs.

    DOI: 10.1021/nn507408m

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  70. Minimal inflammogenicity of pristine single-wall carbon nanotubes.

    Toyokuni S, Jiang LI, Kitaura R, Shinohara H

    Nagoya journal of medical science   Vol. 77 ( 1-2 ) page: 195 - 202   2015.2

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  71. MINIMAL INFLAMMOGENICITY OF PRISTINE SINGLE-WALL CARBON NANOTUBES Reviewed

    Shinya Toyokuni, Li Jiang, Ryo Kitaura, Hisanori Shinohara

    NAGOYA JOURNAL OF MEDICAL SCIENCE   Vol. 77 ( 1-2 ) page: 195 - 202   2015.2

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    Carbon nanotubes (CNTs) are a novel synthetic material comprising only carbon atoms. Based on its rigidity, its electrical and heat conductivity and its applicability to surface manufacturing, this material is expected to have numerous applications in industry. However, due to the material's dimensional similarity to asbestos fibers, its carcinogenicity was hypothesized during the last decade, and indeed, we have shown that multi- wall CNTs (MWCNTs) of 50 nm in diameter are potently carcinogenic to mesothelial cells after intraperitoneal injection. Additionally, we suggested that inflammogenicity after intraperitoneal injection can predict mesothelial carcinogenesis. However, few data have been published on the intraperitoneal inflammogenicity of single-wall CNTs (SWCNTs). Here, we conducted a series of studies on SWCNTs using both intraperitoneal injection into rats and MeT5A mesothelial cells. Intraperitoneal injection of 10 mg SWCNTs caused no remarkable inflammation in the abdominal cavity, and the exposure of MeT5A cells to up to 25 mu g/cm(2) SWCNTs did not alter proliferation. MWCNTs of 50 nm in diameter were used as a positive control, and tangled MWCNTs of 15 nm in diameter were used as a negative control. The results suggest that SWCNTs are a low- risk material with respect to mesothelial carcinogenesis.

    Web of Science

  72. MINIMAL INFLAMMOGENICITY OF PRISTINE SINGLE-WALL CARBON NANOTUBES

    Toyokuni Shinya, Jiang Li, Kitaura Ryo, Shinohara Hisanori

    NAGOYA JOURNAL OF MEDICAL SCIENCE   Vol. 77 ( 1-2 ) page: 195 - 202   2015.2

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  73. Minimal inflammogenicity of pristine single-wall carbon nanotubes.

    Shinya Toyokuni, L I Jiang, Ryo Kitaura, Hisanori Shinohara

    Nagoya journal of medical science   Vol. 77 ( 1-2 ) page: 195 - 202   2015.2

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    Carbon nanotubes (CNTs) are a novel synthetic material comprising only carbon atoms. Based on its rigidity, its electrical and heat conductivity and its applicability to surface manufacturing, this material is expected to have numerous applications in industry. However, due to the material's dimensional similarity to asbestos fibers, its carcinogenicity was hypothesized during the last decade, and indeed, we have shown that multi-wall CNTs (MWCNTs) of 50 nm in diameter are potently carcinogenic to mesothelial cells after intraperitoneal injection. Additionally, we suggested that inflammogenicity after intraperitoneal injection can predict mesothelial carcinogenesis. However, few data have been published on the intraperitoneal inflammogenicity of single-wall CNTs (SWCNTs). Here, we conducted a series of studies on SWCNTs using both intraperitoneal injection into rats and MeT5A mesothelial cells. Intraperitoneal injection of 10 mg SWCNTs caused no remarkable inflammation in the abdominal cavity, and the exposure of MeT5A cells to up to 25 μg/cm(2) SWCNTs did not alter proliferation. MWCNTs of 50 nm in diameter were used as a positive control, and tangled MWCNTs of 15 nm in diameter were used as a negative control. The results suggest that SWCNTs are a low-risk material with respect to mesothelial carcinogenesis.

    PubMed

  74. 16pAH-5 Edge magnetism arising from h-BN nanomeshes

    Tagami Y., Roche S., Nagano K., Nomura K., Ohata C., Takabayashi Y., Kitaura R., Shinohara H., Haruyama J., Soriano D.

    Meeting Abstracts of the Physical Society of Japan   Vol. 70 ( 0 ) page: 1526 - 1526   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_1526

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  75. Comparison of the acute effects of right ventricular apical pacing and biventricular pacing in patients with heart failure.

    Kanzaki H, Satomi K, Noda T, Shimizu W, Kamakura S, Kitaura Y, Ishizaka N, Kitakaze M

    Internal medicine (Tokyo, Japan)   Vol. 54 ( 11 ) page: 1329 - 35   2015

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    DOI: 10.2169/internalmedicine.54.3081

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  76. Synthesis and TEM structural characterization of C-60-flattened carbon nanotube nanopeapods Reviewed

    Qing Wang, Ryo Kitaura, Yuta Yamamoto, Shigeo Arai, Hisanori Shinohara

    NANO RESEARCH   Vol. 7 ( 12 ) page: 1843 - 1848   2014.12

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    A fully flattened carbon nanotube (FNT), a graphene nanoribbon (GNR) analogue, provides a hollow space at edges for endohedral doping. Due to the unique shape of the hollow space of FNTs, novel types of low-dimensional arrangements of atoms and molecules can be obtained through endohedral doping into FNTs, which provides a new type of nanopeapods. FNT-based nanopeapods have been synthesized through endohedral doping of C-60, and their structural characterization with transmission electron microscopy (TEM) performed. The doping of C-60 into the inner hollow space of FNTs has been carried out via the gas-phase filling method, where open-ended FNTs are sealed in a glass ampoule and heated at 723-773 K for two days. TEM observations show that most of the encapsulated C-60 molecules align as single molecular chains along the edges of FNTs and that some of the C-60 forms two-dimensional close-packed structures inside FNTs.

    DOI: 10.1007/s12274-014-0544-6

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  77. Rayleigh scattering studies on inter-layer interactions in structure-defined individual double-wall carbon nanotubes

    Zhao SH., Kitagawa T., Miyauchi Y., Matsuda K., Shinohara H., Kitaura R.

    NANO RESEARCH     page: 1548   2014.10

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  78. Rayleigh scattering studies on inter-layer interactions in structure-defined individual double-wall carbon nanotubes Reviewed

    Sihan Zhao, Tomoya Kitagawa, Yuhei Miyauchi, Kazunari Matsuda, Hisanori Shinohara, Ryo Kitaura

    NANO RESEARCH   Vol. 7 ( 10 ) page: 1548 - 1555   2014.10

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    Although the inter-layer coupling in layered materials has attracted considerable interest due to its importance in determining physical properties of two-dimensional systems, studies on the inter-layer coupling in one-dimensional systems have so far been limited. Double-wall carbon nanotubes (DWCNTs) are one of the most fundamental and ideal model systems to study the inter-layer coupling in one-dimensional systems. In this work, Rayleigh scattering spectroscopy and transmission electron microscopy are used to characterize the electronic transition between inner-and outer-nanotubes of the exactly same individual DWCNT. We find that the inter-layer coupling is strong, leading to downshifts in most of the optical transition energies (up to similar to 0.2 eV) compared to isolated CNTs. We also find that the presence of metallic tubes lead to stronger shifts. The inter-layer screening of Coulomb interactions is one of the key factors in explaining the observed results.

    DOI: 10.1007/s12274-014-0515-y

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  79. Drastic Change in Photoluminescence Properties of Graphene Quantum Dots by Chromatographic Separation Reviewed

    Naoto Fuyuno, Daichi Kozawa, Yuhei Miyauchi, Shinichiro Mouri, Ryo Kitaura, Hisanori Shinohara, Toku Yasuda, Naoki Komatsu, Kazunari Matsuda

    ADVANCED OPTICAL MATERIALS   Vol. 2 ( 10 ) page: 983 - 989   2014.10

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    Graphene quantum dots (GQDs) have attracted a great deal of interest from the viewpoints of both fundamental studies and applications. Photoluminescence (PL) is one of the intriguing properties of GQDs, however, the mechanism of the PL in GQDs is not fully understood. In the present study, a drastic change in the PL from UV to red light region is reported among GQDs separated by size-exclusion high performance liquid chromatography. It is confirmed by transmission electron microscopy images that the GQDs are separated by the difference in their overall sizes. Two-dimensional PL excitation spectra of the chromatographically separated GQDs show four distinct emission peaks at approximate to 330, approximate to 440, approximate to 520, and approximate to 600 nm. The dominant luminescence features of the separated GQDs show discrete changes depending on the overall size of GQDs, indicating that the PL variation occurs because of differences in density, shape, and size of sp(2) fragments available in the GQDs.

    DOI: 10.1002/adom.201400200

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  80. Metal-Dependent Stability of Pristine and Functionalized Unconventional Dimetallofullerene M-2@/h-C-80 Reviewed

    Zhiyong Wang, Ryo Kitaura, Hisanori Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 118 ( 25 ) page: 13953 - 13958   2014.6

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    The unstable fullerene I-h-C-80 can be stabilized greatly by encapsulation of two rare-earth metal atoms in its interior. Here we present a theoretical study on the electronic structures and stabilities of dimetallofullerene is M-2@I-h-C-80 (M = Y, La, Gd, Lu). Density functional calculations demonstrate that La-2@I-h,-C-80 has a closed-shell configuration, whereas Y-2@l(h)-C-80 has a triplet ground state. Unlike La-2@I-h,-C-80 with a high stability, Y-2@l(h)-C-80 is found to be a highly reactive radical due to the unpaired electron distributed on the fullerene cage. Such characteristic properties of La-2@I-h,-C-80 and Y-2@l(h)-C-80 originate from the different energy levels of the metal-based molecular orbitals. Y-2@l(h)-C-80 can be stabilized, however, through exterior functionalization with a CF3 group. Interestingly, metallofullerenes Gd-2@I-h,-C-80 and Lu-2@I-h,-C-80 have similar frontier molecular orbitals and chemical stabilities to those of Y-2@I-h,-C-80.

    DOI: 10.1021/jp5028492

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  81. Microporous structures having phenylene fin: Significance of substituent groups for rotational linkers in coordination polymers Reviewed

    Ryotaro Matsuda, Wataru Kosaka, Ryo Kitaura, Yoshiki Kubota, Masaki Takata, Susumu Kitagawa

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 189   page: 83 - 90   2014.5

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    Microporous coordination polymers having various shaped apertures were synthesized and crystallographically characterized using substituted terephthalate ligands. The substituents exert a notable influence on the channel size and shape depending on the orientations and disordering of the phenylene units such as a fin. This is a new aspect of porous coordination polymers, which would provide important information for a precise design of the micropore. (C) 2013 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.micromeso.2013.10.029

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  82. Direct observation of zipper-like wall-to-wall coalescence of double-wall carbon nanotubes Reviewed

    Sihan Zhao, Yasumitsu Miyata, Hisanori Shinohara, Ryo Kitaura

    CARBON   Vol. 71   page: 159 - 165   2014.5

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    In situ transmission electron microscope (TEM) observation has become a fairly powerful characterization method to uniquely provide the real-time information on the dynamics and kinetics of physical and chemical transformations at the nanometer scale. Here, we report a development of a high-temperature-compatible specimen heating holder equipped with a micro-sized carbon nanotube (CNT) network heater. The CNT network heater can heat samples up to extremely high temperature, as high as >2000 degrees C, while minimizing the spatial drift of the samples induced by the heating. This has directly led to a real-time imaging of a purely thermally-driven nano-welding process between two parallel-aligned double-wall carbon nanotubes (DWCNTs) using low-voltage TEM (80 keV); a single larger-diameter DWCNT was formed after the reaction and the reaction rate was determined. This technique developed is basically applicable to the in situ TEM study of various thermal-driven solid-phase dynamical changes/reactions and should provide more significant insight on nanoscience and nanothermodynamics. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbon.2014.01.024

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  83. Structure of Tm-2 and Tm2C2 encapsulated in low-symmetry C-82(C-s(6)) fullerene cage by single crystal X-ray diffraction Reviewed

    Yuki Sado, Shinobu Aoyagi, Noriko Izumi, Ryo Kitaura, Tim Kowalczyk, Jian Wang, Stephan Irle, Eiji Nishibori, Kunihisa Sugimoto, Hisanori Shinohara

    CHEMICAL PHYSICS LETTERS   Vol. 600   page: 38 - 42   2014.4

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    The molecular structures of Tm-2@C-82(C-s(6)) and Tm2C2@C-82(C-s(6)) are determined by means of single crystal X-ray diffraction using the co-crystals with nickel octaethylporphyrin (Ni(OEP)). The molecular orientations and Tm positions of Tm-2@C-82(C-s(6)) and Tm2C2@C-82(C-s(6)) are basically the same each other. One of the two Tm positions is very close to the Tm position of Tm@C-82(C-s(6)). These facts demonstrate that the stable endohedral Tm positions are not fundamentally affected by the addition of the other Tm atoms but dependent on the kind of the fullerene cage structure. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2014.03.047

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  84. Size-selective complexation and extraction of endohedral metallofullerenes with cycloparaphenylene. Reviewed International journal

    Yusuke Nakanishi, Haruka Omachi, Sanae Matsuura, Yasumitsu Miyata, Ryo Kitaura, Yasutomo Segawa, Kenichiro Itami, Hisanori Shinohara

    Angewandte Chemie (International ed. in English)   Vol. 53 ( 12 ) page: 3102 - 3106   2014.3

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    A new strategy for the non-chromatographic extraction of metallofullerenes from solutions of arc-processed raw soot is based on the size-selective complexation with cycloparaphenylene (CPP). [11]CPP has a high affinity for Mx @C82 (x=1, 2); for example, Gd@C82 can be selectively extracted from a fullerene mixture by the addition of [11]CPP. This approach should open new opportunities in metallofullerene chemistry, including for the bulk extraction of metallofullerenes.

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  85. Metal catalyst-free mist flow chemical vapor deposition growth of single-wall carbon nanotubes using C-60 colloidal solutions Reviewed

    Yun Sun, Ryo Kitaura, Jinying Zhang, Yasumitsu Miyata, Hisanori Shinohara

    CARBON   Vol. 68   page: 80 - 86   2014.3

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    Metal catalyst-free mist flow chemical vapor deposition (CVD) growth of single-walled carbon nanotubes (SWCNTs) with C-60 fullerenes has been investigated by using an aqueous colloidal C-60 solution. Under the optimum reaction condition, relatively uniform SWCNTs with a mean diameter of 1.28 nm can be synthesized without any treatments of C-60 prior to CVD. Cap opening, nucleation and the growth of SWCNTs have been occurring almost simultaneously during the present CVD. C-60 can be used as the seeds (i.e., end-caps) of SWCNTs, in which oxygen atoms from water molecules provide etching of C-60 into caps. Furthermore, the coalescence of C-60 caps into a larger one leads to the growth of SWCNTs with larger diameters. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbon.2013.10.038

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  86. In Situ Observation of Gold Chloride Decomposition in a Confined Nanospace by Transmission Electron Microscopy Reviewed

    Keita Kobayashi, Ryo Kitaura, Katsuhiro Sasaki, Kotaro Kuroda, Takeshi Saito, Hisanori Shinohara

    MATERIALS TRANSACTIONS   Vol. 55 ( 3 ) page: 461 - 465   2014.3

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    The behavior of gold chloride (AuClx) encapsulated within the inner space of a single-wall carbon nanotube (SWCNT) was investigated under electron beam (e-beam) irradiation and high temperatures. Analysis of the pristine specimen by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and Raman spectroscopy show that AuClx is encapsulated within the SWCNTs as a dilute disordered structure. In situ TEM observation of the specimen under e-beam irradiation shows that, within the SWCNTs, AuClx is reduced to a crystalline Au nanowire (AuNW). The AuNW drifts significantly within the SWCNT during the reduction. At high temperatures (&gt;673 K), in situ TEM shows that the AuNW oscillates intermittently at a frequency of similar to 1.1 s(-1) and amplitude of similar to 60 nm. Raman spectroscopy and EDX suggest that these phenomena are caused by an increase in the internal gas pressure in the SWCNTs because the decomposition of AuClx by e-beam irradiation or heat treatment produced chlorine (Cl-2) gas.

    DOI: 10.2320/matertrans.MD201308

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  87. Synthesis of refractory conductive niobium carbide nanowires within the inner space of carbon nanotube templates Reviewed

    Keita Kobayashi, Ryo Kitaura, Qing Wang, Ikuya Wakamori, Hisanori Shinohara, Satoshi Anada, Takeshi Nagase, Takeshi Saito, Masaharu Kiyomiya, Hidehiro Yasuda

    APPLIED PHYSICS EXPRESS   Vol. 7 ( 1 )   2014.1

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    Conductive niobium carbide (NbC) nanowires with diameters of 1-3 nm were synthesized within the inner space of carbon nanotubes (CNTs) by exposing the CNTs to niobium (V) chloride vapor through hydrogen reduction. The NbC nanowires were found to have a NaCl-type crystal structure by transmission electron microscopy and transmission electron diffractometry. Results from electronic transport measurements imply that the electrical conductivity of the synthesized product was improved compared with that of empty CNTs. (C) 2014 The Japan Society of Applied Physics

    DOI: 10.7567/APEX.7.015101

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  88. Observation and Characterization of Fragile Organometallic Molecules Encapsulated in Single-Wall Carbon Nanotubes Reviewed

    Daisuke Ogawa, Ryo Kitaura, Takeshi Saito, Shinobu Aoyagi, Eiji Nishibori, Makoto Sakata, Tetsuya Nakamura, Hisanori Shinohara

    JOURNAL OF NANOMATERIALS   Vol. 2014   2014

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    Thermally fragile tris(eta(5) -cyclopentadienyl)erbium (ErCp3) molecules are encapsulated in single-wall carbon nanotubes (SWCNTs) with high yield. We realized the encapsulation of ErCp3 with high filling ratio by using high quality SWCNTs at an optimized temperature under higher vacuum. Structure determination based on high-resolution transmission electron microscope observations together with the image simulations reveals the presence of almost free rotation of each ErCp3 molecule in SWCNTs. The encapsulation is also confirmed by X-ray diffraction. Trivalent character of Er ions (i.e., Er3+) is confirmed by X-ray absorption spectrum.

    DOI: 10.1155/2014/539295

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  89. 28pAL-8 Studies on manipulation of nanoparticles using electron vortex beams

    Hirakawa K., Saitoh K., Yoshida K., Tanaka N., Sasaki Y., Kitaura R., Shinohara H.

    Meeting Abstracts of the Physical Society of Japan   Vol. 69 ( 0 ) page: 928 - 928   2014

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    DOI: 10.11316/jpsgaiyo.69.1.4.0_928_3

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  90. 8pBH-4 Synthesis and characterization of transition metal dichalcogenides(Present Status and Fixture Scope of Science of Atomic Layers: Progress in Physics, Chemistry, and Engineering:Introduction)

    Kitaura Ryo

    Meeting Abstracts of the Physical Society of Japan   Vol. 69 ( 0 ) page: 485 - 485   2014

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    DOI: 10.11316/jpsgaiyo.69.2.4.0_485_2

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  91. A cubic dipole lattice of water molecules trapped inside carbon cages. Reviewed International journal

    Shinobu Aoyagi, Norihisa Hoshino, Tomoyuki Akutagawa, Yuki Sado, Ryo Kitaura, Hisanori Shinohara, Kunihisa Sugimoto, Rui Zhang, Yasujiro Murata

    Chemical communications (Cambridge, England)   Vol. 50 ( 5 ) page: 524 - 526   2014

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    We report the crystal structure and dielectric properties of a pure H2O@C60 crystal at low temperature. The caged water molecules free from the hydrogen bonds rotate even at 8 K. The antifreeze rotating water molecules respond to an external electric field due to their permanent dipole moment.

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  92. Missing Small-Bandgap Metallofullerenes: Their Isolation and Electronic Properties Reviewed International journal

    Zhiyong Wang, Yusuke Nakanishi, Shoko Noda, Hiroyuki Niwa, Jinying Zhang, Ryo Kitaura, Hisanori Shinohara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 52 ( 45 ) page: 11770 - 11774   2013.11

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    DOI: 10.1002/anie.201305573

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  93. Growth of carbon nanotubes via twisted graphene nanoribbons Reviewed

    Hong En Lim, Yasumitsu Miyata, Ryo Kitaura, Yoshifumi Nishimura, Yoshio Nishimoto, Stephan Irle, Jamie H. Warner, Hiromichi Kataura, Hisanori Shinohara

    NATURE COMMUNICATIONS   Vol. 4   page: 2548   2013.10

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    Carbon nanotubes have long been described as rolled-up graphene sheets. It is only fairly recently observed that longitudinal cleavage of carbon nanotubes, using chemical, catalytical and electrical approaches, unzips them into thin graphene strips of various widths, the so-called graphene nanoribbons. In contrast, rolling up these flimsy ribbons into tubes in a real experiment has not been possible. Theoretical studies conducted by Kit et al. recently demonstrated the tube formation through twisting of graphene nanoribbon, an idea very different from the rolling-up postulation. Here we report the first experimental evidence of a thermally induced self-intertwining of graphene nanoribbons for the preferential synthesis of (7, 2) and (8, 1) tubes within parent-tube templates. Through the tailoring of ribbon's width and edge, the present finding adds a radically new aspect to the understanding of carbon nanotube formation, shedding much light on not only the future chirality tuning, but also contemporary nanomaterials engineering.

    DOI: 10.1038/ncomms3548

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  94. Perfectly Ordered Two-Dimensional Layer Structures Found in Some Endohedral Metallofullerenes Reviewed

    Sachiko Maki, Eiji Nishibori, Yutaka Kitamura, Ryo Kitaura, Masayuki Ishihara, Takayuki Aono, Shinobu Aoyagi, Masaki Takata, Makoto Sakata, Hisanori Shinohara

    CRYSTAL GROWTH & DESIGN   Vol. 13 ( 8 ) page: 3632 - 3636   2013.8

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    A two-dimensional (2D) arrangement of metallofullerenes for both M@C-82 (isomer I) (M = Y, La, Ce, Pr) and (M2Cy)@C-82 (isomer III) (M = Er, y = 0, 2; M = Sc, y = 2) is crystallized with a 1:2 fullerene/toluene molecular ratio. The determined crystal is a 2D layered structure, which is composed of metallofullerene layers sandwiched by the toluene layers. Although the M@C-82(I) arrangement in a 1:1 crystal is almost identical to that of (M2Cy)@C-82(III), the M@C-82(I) arrangement in a 1:2 crystal is different from (M,Cy)@C-82(III). It is found that the difference of the molecular arrangement strongly correlates with an orientation of metallofullerenes in a 2D layer. Our findings suggest the existence of a subtle but important interaction between the confined atoms/molecules and the solvent molecules/toluene through the carbon cage, which leads to a guiding principle of crystallization control with a solvent ingredient for metallofullerenes.

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  95. Rapid Single-Stage Separation of Micrometer-Long and High-Purity Semiconducting Carbon Nanotubes by Gel Filtration

    Thendie Boanerges, Miyata Yasumitsu, Kitaura Ryo, MIYAUCHI Yuhei, MATSUDA Kazunari, SHINOHARA Hisanori

    Applied physics express   Vol. 6 ( 6 ) page: "065101 - 1"-"065101-4"   2013.6

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  96. Rapid single-stage separation of micrometer-long and high-purity semiconducting carbon nanotubes by gel filtration Reviewed

    Boanerges Thendie, Yasumitsu Miyata, Ryo Kitaura, Yuhei Miyauchi, Kazunari Matsuda, Hisanori Shinohara

    Applied Physics Express   Vol. 6 ( 6 )   2013.6

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    We demonstrate the separation of high-purity, long semiconducting single-wall carbon nanotubes (s-SWCNTs) by single-stage gel filtration. Semiconducting SWCNTs are preferentially adsorbed on an allyl dextran-based gel column and then eluted with surfactant solution at a rate that depends on nanotube length as well as electronic type of nanotubes. These differences allow the separation of length-sorted and purity-enhanced s-SWCNTs by fractionated collection of the eluate, which provides the desired nanotubes for electronic device applications. © 2013 The Japan Society of Applied Physics.

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  97. STM and STS Studies on the Density of States Modulation of Pr@C-82 and Sc3C2@C-80 Binary-Metallofullerene Peapods Reviewed

    Yuki Iijima, Kazunori Ohashi, Naoki Imazu, Ryo Kitaura, Ken Kanazawa, Atsushi Taninaka, Osamu Takeuchi, Hidemi Shigekawa, Hisanori Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 117 ( 14 ) page: 6966 - 6971   2013.4

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    The density of states modulation of single-wall carbon nanotubes (SWCNTs) is induced by the encapsulation of two different kinds of metallofullerenes (Pr@C-82 and Sc3C2@C-80). We report the observation of the modulated density of states using scanning tunneling microscopy/spectroscopy, where the modulation is successfully reproduced by density functional theory calculation. The metallofullerene molecules in SWCNTs strongly affect the local band structures of SWCNTs. The present findings show that the local electronic structures of SWCNTs can be modified by not only varying the geometric structures of SWCNTs but also the varieties of metallofullerenes encapsulated.

    DOI: 10.1021/jp3128466

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  98. Fabrication and Characterization of Fully Flattened Carbon Nanotubes: A New Graphene Nanoribbon Analogue Reviewed

    D. H. Choi, Q. Wang, Y. Azuma, Y. Majima, J. H. Warner, Y. Miyata, H. Shinohara, R. Kitaura

    SCIENTIFIC REPORTS   Vol. 3   2013.4

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    Graphene nanoribbons (GNR) are one of the most promising candidates for the fabrication of graphene-based nanoelectronic devices such as high mobility field effect transistors (FET). Here, we report a high-yield fabrication of a high quality another type of GNR analogue, fully flattened carbon nanotubes (flattened CNTs), using solution-phase extraction of inner tubes from large-diameter multi-wall CNTs (MWCNTs). Transmission electron microscopy (TEM) observations show that flattened CNTs have width of typically 20 nm and a barbell-like cross section. Measurements of the low-bias conductance of isolated flattened CNTs as a function of gate voltage shows that the flattened CNTs display ambipolar conduction which is different from those of MWCNTs. The estimated gap based on temperature dependence of conductivity measurements of isolated flattened CNTs is 13.7 meV, which is probably caused by the modified electronic structure due to the flattening.

    DOI: 10.1038/srep01617

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  99. Structure of Tm@C-82(I) Metallofullerene by Single-Crystal X-ray Diffraction Using the 1:2 Co-Crystal with Octaethylporphyrin Nickel (Ni(OEP)) Reviewed

    Yuki Sado, Shinobu Aoyagi, Ryo Kitaura, Yasumitsu Miyata, Eiji Nishibori, Hiroshi Sawa, Kunihisa Sugimoto, Hisanori Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 117 ( 12 ) page: 6437 - 6442   2013.3

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    The molecular structure of Tm@C-82 (isomer I) is revealed by single-crystal X-ray diffraction of the 1:2 cocrystal with nickel octaethylporphyrin (Ni(OEP)). A rotational movement of Tm@C-82(I) molecule in the 1:1 cocrystal is dramatically suppressed by the coordination of two Ni(OEP) ligands in the 1:2 cocrystal. The structure of Tm@C-82(I) in the crystal is explained by the orientation disorder with two different orientations. The so-obtained carbon cage structure is C-5(6)-C-82. The restricted molecular orientations of Tm@C-82(I) in the 1:2 cocrystal are achieved by the molecular dipole moment of Tm@C-82(1) that interacts with two Ni(OEP) ligands. The present study suggests that the intermolecular interactions can reduce the degree of freedom in the orientation of spherical metallofullerene molecules in the crystals and complexes.

    DOI: 10.1021/jp311948c

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  100. Thin single-wall BN-nanotubes formed inside carbon nanotubes Reviewed

    Ryo Nakanishi, Ryo Kitaura, Jamie H. Warner, Yuta Yamamoto, Shigeo Arai, Yasumitsu Miyata, Hisanori Shinohara

    SCIENTIFIC REPORTS   Vol. 3   page: 1385   2013.3

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    We report a high yield synthesis of single-wall boron nitride nanotubes (SWBNNTs) inside single-wall carbon nanotubes (SWCNTs), a nano-templated reaction, using ammonia borane complexes (ABC) as a precursor. Transmission electron microscope (TEM), high angle annular dark field (HAADF)-scanning TEM (STEM), electron energy loss spectra (EELS) and high resolution EELS mapping using aberration-corrected TEM system clearly show the formation of thin SWBNNTs inside SWCNTs. We have found that the yield of the SWBNNT formation is high and that the most of ABC molecules decompose and fuse to form the thin BNNTs at a temperature of 1,673 K having a narrow diameter distribution of 0.7 +/- 0.1 nm. Optical absorption measurements suggest that the band gap of the thin SWBNNTs is about 6.0 eV, which provide the ideal insulator nanotubes with very small diameters.

    DOI: 10.1038/srep01385

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  101. Significance of horizontal propagation of synchronized activities in human epileptic neocortex investigated by optical imaging and immunohistological study.

    Hiraishi T, Kitaura H, Oishi M, Fukuda M, Kameyama S, Takahashi H, Kakita A, Fujii Y

    Epilepsy research   Vol. 104 ( 1-2 ) page: 59 - 67   2013.3

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    DOI: 10.1016/j.eplepsyres.2012.09.014

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  102. Thermal/electron irradiation assisted coalescence of Sc3N@C 80 fullerene in carbon nanotube and evidence of charge transfer between pristine/coalesced fullerenes and nanotubes Reviewed

    Ahmadreza Fallah, Yuki Yonetani, Ryosuke Senga, Kaori Hirahara, Ryo Kitaura, Hisanori Shinohara, Yoshikazu Nakayama

    Nanoscale   Vol. 5 ( 23 ) page: 11755 - 11760   2013

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    Sc3N@C80 fullerenes are inserted inside carbon nanotubes (CNTs). The results show that the thermal stability of Sc 3N@C80 fullerenes is around 1200 °C for the fullerenes resting on the wall of CNTs. Internal fullerenes show stability up to 1300 °C, which portrays them as one of most stable types of fullerenes. Electron irradiation of the peapods at 90 kV leads to the formation of capsules inside the CNTs at 5 × 109 e nm-2 electron dosage. This value is an order of magnitude higher than the threshold of electron-induced damage in C60 molecules. Electron energy loss spectroscopy confirms the presence of Sc atoms in capsules. Encapsulation of fullerenes and capsule formation changes the oxidation state of Sc atoms from +2.5 towards +3. This is an evidence of charge transfer between the fullerene/capsule cage and CNT walls. © 2013 The Royal Society of Chemistry.

    DOI: 10.1039/c3nr03233g

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  103. Crystal Structure and Dielectric Property of H_2O@C_<60>

    Aoyanagi Shinobu, Hoshino Norihisa, Akutagawa Tomoyuki, Sado Yuki, Kitaura Ryo, Shinohara Hisanori, Sugimoto Kunihisa, Rui Zhang, Murata Yasujiro

    Meeting Abstracts of the Physical Society of Japan   Vol. 68 ( 0 ) page: 854 - 854   2013

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    DOI: 10.11316/jpsgaiyo.68.2.4.0_854_4

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  104. Chirally selective growth and extraction of single-wall carbon nanotubes via fullerene nano-peapods Reviewed

    Jinying Zhang, Feng Zhou, Yasumitsu Miyata, Ryo Kitaura, Haibin Su, Hisanori Shinohara

    RSC ADVANCES   Vol. 3 ( 38 ) page: 16954 - 16957   2013

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    Single-wall carbon nanotubes (SWCNTs) grown from C-60 and C-70 inside SWCNTs with diameters of 1.5 +/- 0.1 nm are investigated. The as-produced SWCNTs have been extracted, separated, and characterized. The products from C-70 are dominated by (7,6) and (9,4) SWCNTs, whereas those from C-60 are dominated by (6,5) SWCNTs.

    DOI: 10.1039/c3ra43133a

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  105. Evidence of Diamond Nanowires Formed inside Carbon Nanotubes from Diamantane Dicarboxylic Acid Reviewed

    Jinying Zhang, Zhen Zhu, Yanquan Feng, Hitoshi Ishiwata, Yasumitsu Miyata, Ryo Kitaura, Jeremy E. P. Dahl, Robert M. K. Carlson, Natalie A. Fokina, Peter R. Schreiner, David Tomanek, Hisanori Shinohara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 52 ( 13 ) page: 3717 - 3721   2013

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    DOI: 10.1002/anie.201209192

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  106. CONTROLLABLE CHEMICAL VAPOR DEPOSITION SYNTHESIS OF SINGLE-WALL CARBON NANOTUBES USING MIST FLOW METHOD Reviewed

    Yun Sun, Ryo Kitaura, Takuya Nakayama, Yasumitsu Miyata, Hisanori Shinohara

    NANO   Vol. 7 ( 6 )   2012.12

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    The influences of synthesis parameters on the mean diameter and diameter distribution of as-grown single-wall carbon nanotubes (SWCNTs) with chemical vapor deposition (CVD) using the mist flow method have been investigated in detail with Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We found that CVD reaction temperature and flow rate play an essential role in controlling the mean diameter and the quality of as-grown SWCNTs. Furthermore, we found that the carbon supply kinetics can be a dominant factor to determine the diameter of as-grown SWCNTs in the present mist flow method. Under a different combination of various parameters, the mean diameter of SWCNTs can be varied from 0.9 nm to 1.5 nm controllably.

    DOI: 10.1142/S1793292012500452

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  107. Carbon Nanotubes Encapsulating Atoms and Molecules

    KITAURA Ryo, MIYATA Yasumitsu, SHINOHARA Hisanori

      Vol. 33 ( 10 ) page: 563 - 568   2012.10

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  108. Synthesis and Transformation of Linear Adamantane Assemblies inside Carbon Nanotubes Reviewed

    Jinying Zhang, Yanquan Feng, Hitoshi Ishiwata, Yasumitsu Miyata, Ryo Kitaura, Jeremy E. P. Dahl, Robert M. K. Carlson, Hisanori Shinohara, David Tomanek

    ACS NANO   Vol. 6 ( 10 ) page: 8674 - 8683   2012.10

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    We report the assembly and thermal transformation of linear diamondoid assemblies inside carbon nanotubes. Our calculations and observations indicate that these molecules undergo selective reactions within the narrow confining space of a carbon nanotube. Upon vacuum annealing of adamantane molecules encapsulated in a carbon nanotube, we observe a sharp Raman feature at 1857 cm(-1), which we interpret as a stretching mode of carbon chains formed by thermal conversion of adamantane inside a carbon nanotube. Introduction of pure hydrogen during thermal annealing, however, suppresses the formation of carbon chains and seems to keep adamantane intact.

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  109. Topological Difference in 2D Layers Steers the Formation of Rigid and Flexible 3D Supramolecular Isomers: Impact on the Adsorption Properties Reviewed

    Prakash Kanoo, Ryotaro Matsuda, Ryo Kitaura, Susumu Kitagawa, Tapas Kumar Maji

    INORGANIC CHEMISTRY   Vol. 51 ( 17 ) page: 9141 - 9143   2012.9

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    .Starting with the same precursors, pyridine-2,3-dicarboxylate (pyrdc) and 4,4'-bipyridyl (bipy), two 3D porous coordination polymers, ([Cu(bipy)(0.5)(pyrdc)]center dot 3H(2)O} (1) and ([Cu(bipy)(0.5)(pyrdc)].0.5bipy center dot 3H(2)O} (2), have been synthesized by changing the solvent system from MeOH/H2O to EtOH/H2O. Single-crystal structure analysis revealed that 1 and 2 are supramolecular isomers with 3D pillared-layer structures having 1D channel systems. Isomer 1 has a flexible structure and shows gated adsorption behavior, while framework 2 has a rigid backbone and exhibits the adsorption properties of typical microporous materials.

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  110. Fabrication and Characterization of Graphene/Hexagonal Boron Nitride Hybrid Sheets

    MIYATA Yasumitsu, MAEDA Eriko, KAMON Keiichi, KITAURA Ryo, SASAKI Yuki, SUZUKI Shoji, SHINOHARA Hisanori

    Applied physics express   Vol. 5 ( 8 ) page: "085102 - 1"-"085102-3"   2012.8

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  111. Fabrication and Characterization of Graphene/Hexagonal Boron Nitride Hybrid Sheets Reviewed

    Yasumitsu Miyata, Eriko Maeda, Keiichi Kamon, Ryo Kitaura, Yuki Sasaki, Shoji Suzuki, Hisanori Shinohara

    APPLIED PHYSICS EXPRESS   Vol. 5 ( 8 )   2012.8

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    The synthesis of graphene and hexagonal boron nitride (hBN) hybrid sheets has been achieved using a two-step chemical vapor deposition (CVD) process. Individual grains of single-layer graphene are grown from methane, and hBN is, then, synthesized from ammonia borane on the same copper (Cu) foil. Optical absorption and Raman measurements reveal that the hBN is formed on the bare surface of Cu foil and the graphene grains play a crucial role as an inactive protective layer of Cu foil for the ammonia borane CVD. Furthermore, the hBN growth is found to be initiated preferentially by the edge of graphene grains. (C) 2012 The Japan Society of Applied Physics

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  112. Dimerization-Initiated Preferential Formation of Coronene-Based Graphene Nanoribbons in Carbon Nanotubes Reviewed

    Miho Fujihara, Yasumitsu Miyata, Ryo Kitaura, Yoshifumi Nishimura, Cristopher Camacho, Stephan Irle, Yoko Iizumi, Toshiya Okazaki, Hisanori Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 116 ( 28 ) page: 15141 - 15145   2012.7

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    We have investigated the growth mechanism of coronene-derived graphene nanoribbons (GNRs) using two different precursors: coronene and a dimer form of coronene, so-called dicoronylene (C48H20). For both of the precursors, the formation of nanoribbon-like materials inside carbon nanotubes (CNTs) was confirmed by transmission electron microscope observations. Experimental and theoretical Raman analysis reveals that the samples also encapsulated dicoronylene and linearly condensed other coronene oligomers, which can be regarded as analogues to GNRs. Interestingly, it was found that the present doping condition of coronene yields dicoronylene prior to encapsulation due to the thermal dimerization of coronene. These results indicate that the dimerization before the encapsulation drives the preferential formation of the coronene-based GNRs within CNTs.

    DOI: 10.1021/jp3037268

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  113. Preparation and Observation of an Atomic Layer of Gold Formed on the Surface of Graphene

    Sasaki Yuki, Kitaura Ryo, Yamamoto Yuta, ARAI Shigeo, SUZUKI Shoji, MIYATA Yasumitsu, SHINOHARA Hisanori

    Applied physics express   Vol. 5 ( 6 ) page: "065103 - 1"-"065103-3"   2012.6

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  114. Preparation and Observation of an Atomic Layer of Gold Formed on the Surface of Graphene Reviewed

    Yuki Sasaki, Ryo Kitaura, Yuta Yamamoto, Shigeo Arai, Shoji Suzuki, Yasumitsu Miyata, Hisanori Shinohara

    APPLIED PHYSICS EXPRESS   Vol. 5 ( 6 )   2012.6

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    Freestanding clean graphene is prepared using graphene samples grown by chemical vapor deposition and direct transfer onto a SiN grid followed by hydrogen plasma treatment. High-resolution transmission electron microscopy has shown that the Au atoms deposited on the graphene possess a unique layer structure with a square arrangement of Au atoms. We found that the Au nanostructure vaporizes under mild electron beam irradiation conditions, which is specific to the unique thin layer structure. (C) 2012 The Japan Society of Applied Physics

    DOI: 10.1143/APEX.5.065103

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  115. Electronic structure of Eu atomic wires encapsulated inside single-wall carbon nanotubes

    Nakanishi, Ryo; Kitaura, Ryo; Ayala, Paola; et al.

    Physical Review B   Vol. 86 ( 11 ) page: 115445   2012

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  116. Dimerization-Initiated Preferential Formation of Coronene-Based Graphene Nanoribbons in Carbon Nanotubes Reviewed

    Fujihara, Miho; Miyata, Yasumitsu; Kitaura, Ryo; et al.

    Journal of Physical Chemistry C   Vol. 116 ( 28 ) page: 15141-15145   2012

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  117. Carbon Nanotubes Encapsulating Atoms and Molecules

    KITAURA Ryo, MIYATA Yasumitsu, SHINOHARA Hisanori

    Hyomen Kagaku   Vol. 33 ( 10 ) page: 563 - 568   2012

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    Carbon nanotube possesses one-dimensional tubular structure whose diameter typically ranges from 0.4 to 5 nm. Recently, significant research efforts have been devoted to encapsulate various atoms and molecules into inner space of carbon nanotubes to create novel hybrid one-dimensional materials. In this paper, we review recent studies on carbon nanotubes encapsulating atoms and molecules, where the following topics are discussed in detail:formation of metal atomic wires in carbon nanotubes, structure and dynamics of the atomic wires, chirality control of carbon nanotubes based on fusion reaction in carbon nanotubes and extraction of materials from carbon nanotubes.

    DOI: 10.1380/jsssj.33.563

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  118. Rock-Salt-Type Crystal of Thermally Contracted C60 with Encapsulated Lithium Cation Reviewed

    Shinobu Aoyagi, Yuki Sado, Eiji Nishibori, Hiroshi Sawa, Hiroshi Okada, Hiromi Tobita, Yasuhiko Kasama, Ryo Kitaura, Hisanori Shinohara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 51 ( 14 ) page: 3377 - 3381   2012

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    DOI: 10.1002/anie.201108551

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  119. 27aCC-10 Structure and phase transition of [Li@C_<60>](PF_6)

    Aoyagi S., Sado Y., Nishibori E., Sawa H., Okada H., Tobita H., Kasama Y., Kitaura R., Shinohara H.

    Meeting Abstracts of the Physical Society of Japan   Vol. 67 ( 0 ) page: 922 - 922   2012

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    DOI: 10.11316/jpsgaiyo.67.1.4.0_922_1

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  120. Growth of large-diameter (similar to 4 nm) single-wall carbon nanotubes in the nanospace of mesoporous material SBA-15 Reviewed

    Keita Kobayashi, Ryo Kitaura, Fumihiro Nishimura, Hirofumi Yoshikawa, Kunio Awaga, Hisanori Shinohara

    CARBON   Vol. 49 ( 15 ) page: 5173 - 5179   2011.12

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    Single-wall carbon nanotubes (SWCNTs) have been synthesized by supported-catalyst chemical vapor deposition (CCVD) using one-dimensional (1D) channels of mesoporous silica (SBA-15; mean channel diameter, 6.0 nm) functionalized with carboxyl groups where Co and Fe complexes are encapsulated. The synthesized SWCNTs have much larger diameters than the SWCNTs synthesized by conventional CCVD. Transmission electron microscope observations reveal that large-diameter SWCNTs (&lt;4.2 nm) are grown in 1D channels of SBA-15. Large metal particles formed in the channels should play an important role in the growth of the SWCNTs with larger diameters. (C) 2011 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbon.2011.07.033

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  121. Length-Sorted Semiconducting Carbon Nanotubes for High-Mobility Thin Film Transistors Reviewed

    Yasumitsu Miyata, Kazunari Shiozawa, Yuki Asada, Yutaka Ohno, Ryo Kitaura, Takashi Mizutani, Hisanori Shinohara

    NANO RESEARCH   Vol. 4 ( 10 ) page: 963 - 970   2011.10

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    We have developed a process for chemical purification of carbon nanotubes for solution-processable thin-film transistors (TFTs) having high mobility. Films of the purified carbon nanotubes fabricated by simple drop coating showed carrier mobilities as high as 164 cm(2)V(-1)s(-1), normalized transconductances of 0.78 Sm-1, and on/off current ratios of 10(6). Such high performance requires the preparation of a suspension of micrometer-long and highly purified semiconducting single-walled carbon nanotubes (SWCNTs). Our purification process includes length and electronic-type selective trapping of SWCNTs using recycling gel filtration with a mixture of surfactants. The results provide an important milestone toward printed high-speed and large-area electronics with roll-to-roll and ink-jet device fabrication.

    DOI: 10.1007/s12274-011-0152-7

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  122. Purity-enhanced bulk synthesis of thin single-wall carbon nanotubes using iron-copper catalysts Reviewed

    H. E. Lim, Y. Miyata, T. Nakayama, S. Chen, R. Kitaura, H. Shinohara

    NANOTECHNOLOGY   Vol. 22 ( 39 )   2011.9

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    We report high purity and high yield synthesis of single-wall carbon nanotubes (SWCNTs) of narrow diameter from iron-copper bimetal catalysts. The SWCNTs with diameter of 0.8-1.2 nm are synthesized using the zeolite-supported alcohol chemical vapour deposition method. Single metal and bimetal catalysts are systematically investigated to achieve both the enhancement of SWCNT yield and the suppression of the undesired formation of graphitic impurities. The relative yield and purity of SWCNTs are quantified using optical absorption spectroscopy with an ultracentrifuge-based purification technique. For the single metal catalyst, iron shows the highest catalytic activity compared with the other metals such as cobalt, nickel, molybdenum, copper, and platinum. It has been found that the addition of copper to iron results in the suppression of carbonaceous impurity formation without decreasing the SWCNT yield. The purity-enhanced SWCNT shows fairly low sheet resistance due to the improvement of inter-nanotube contacts. This scalable design of SWCNT synthesis with enhanced purity is therefore a promising tool for shaping future high performance devices.

    DOI: 10.1088/0957-4484/22/39/395602

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  123. Growth of Linear Carbon Chains inside Thin Double-Wall Carbon Nanotubes Reviewed

    C. Zhao, R. Kitaura, H. Hara, S. Irle, H. Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 115 ( 27 ) page: 13166 - 13170   2011.7

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    Fusion reactions of size-selected linear polyyne molecules, C(10)H(2), in the ultrathin one-dimensional (1D) nanospace of double wall carbon nanotubes (DWCNTs) have been observed, leading to the formation of very long linear carbon chains. The formation and growth of long linear carbon chains is investigated by Raman spectroscopy and density-functional tight-binding-based molecular dynamics simulations. The high-resolution transmission electron microscope images of C(10)H(2)@DWCNTs show that the encapsulated linear C(10)H(2) molecules have a length of 1.2-1.3 nm. After the high temperature annealing at 1073-1273 K under high vacuum conditions, new Raman bands appear at 1800-1850 cm(-1), and the Raman bands arising from encapsulated pristine polyyne molecules at 2000-2200 cm(-1) completely disappear. This is clear evidence that a fusion reaction occurs to form long linear carbon chains inside the ID nanospace of DWCNTs.

    DOI: 10.1021/jp201647m

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  124. Direct HRTEM Observation of Ultrathin Freestanding Ionic Liquid Film on Carbon Nanotube Grid Reviewed

    Shimou Chen, Keita Kobayashi, Ryo Kitaura, Yasumitsu Miyata, Hisanori Shinohara

    ACS NANO   Vol. 5 ( 6 ) page: 4902 - 4908   2011.6

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    Direct imaging of liquids by electron microscopy has been extremely difficult due to their high volatility. Ionic liquids are a unique liquid material with almost zero vapor pressure, which allows us to characterize them under high-vacuum conditions. Here we report the first direct observation of the microstructure and phase behavior of an imidazolium-based room-temperature ionic liquid by high-resolution transmission electron microscopy with the aid of a special carbon nanotube network, which is able to support a freestanding ultrathin ionic liquid film on its nanosized holes. It was found that the existence of cluster structures is one of the intrinsic properties of the ionic liquid in its whole liquid phase range. Furthermore, the size and mobility of the clusters play an important role during phase transition of the ionic liquid. We show that the direct HRTEM imaging on freestanding liquid film is a powerful technique to obtain insight into the structure of ionic liquids and their phase behavior. The present study can provide an important starting point for more sophisticated structural studies on the microstructure of liquidus materials.

    DOI: 10.1021/nn2009968

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  125. Low voltage electron diffractive imaging of atomic structure in single-wall carbon nanotubes Reviewed

    Osamu Kamimura, Yosuke Maehara, Takashi Dobashi, Keita Kobayashi, Ryo Kitaura, Hisanori Shinohara, Hiroyuki Shioya, Kazutoshi Gohara

    APPLIED PHYSICS LETTERS   Vol. 98 ( 17 )   2011.4

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    The demand for atomic-scale analysis without serious damage to the specimen has been increasing due to the spread of applications with light-element three-dimensional (3D) materials. Low voltage electron diffractive imaging has the potential possibility to clarify the atomic-scale structure of 3D materials without causing serious damage to specimens. We demonstrate low-voltage (30 kV) electron diffractive imaging of single-wall carbon nanotube at a resolution of 0.12 nm. In the reconstructed pattern, the intensity difference between single carbon atom and two overlapping atoms can be clearly distinguished. The present method can generally be applied to other materials including biologically important ones. (C) 2011 American Institute of Physics. [doi:10.1063/1.3582240]

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  126. Irregular Modulation of Density-of-States of Nano-Peapods Encapsulating Gd@C-82 Metallofullerenes Reviewed

    Kazunori Ohashi, Naoki Imazu, Ryo Kitaura, Hisanori Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 115 ( 10 ) page: 3968 - 3972   2011.3

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    The modifications of density-of-states (DOS) of single-wall carbon nanotubes (SWCNTs) induced by encapsulation of Gd@C-82 metallofullerenes have been studied by a combination of scanning tunneling microscopy/spectroscopy (STM/STS) and DFT. We demonstrate that internal orientation of Gd@C-82 molecules inside SWCNTs can strongly affect the electronic structure of SWCNTs. The present findings suggest that not only encapsulated molecules but also their molecular orientations can be a tunable parameter with which we can modulate local electronic structures of SWCNTs.

    DOI: 10.1021/jp1123426

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  127. A resonant photoemission insight to the electronic structure of Gd nanowires templated in the hollow core of SWCNTs Reviewed

    P. Ayala, R. Kitaura, C. Kramberger, H. Shiozawa, N. Imazu, K. Kobayashi, D. J. Mowbray, P. Hoffmann, H. Shinohara, T. Pichler

    Mater. Express   Vol. 1 ( 1 ) page: 30 - 35   2011.3

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    DOI: 10.1166/mex.2011.1004

  128. Templating rare-earth hybridization via ultrahigh vacuum annealing of ErCl3 nanowires inside carbon nanotubes Reviewed

    Paola Ayala, Ryo Kitaura, Ryo Nakanishi, Hidetsugu Shiozawa, Daisuke Ogawa, Patrick Hoffmann, Hinsanori Shinohara, Thomas Pichler

    PHYSICAL REVIEW B   Vol. 83 ( 8 )   2011.2

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    Here we report on controlling the effective hybridization and charge transfer of rare-earth elements inside a carbon nanotube (CNT) nanoreactor. The tubular space inside CNTs can encapsulate one-dimensional (1D) crystals such as ErCl3, which we have used as a starting material. Applying a thermochemical reaction in ultrahigh vacuum, we obtain elemental Er nanowires still encapsulated in the CNTs. The hybridization degree and the effective charge changes were directly accessed across the Er 4d and 3d edges by high-energy spectroscopy. It was found that Er is trivalent but the effective valence is reduced for the Er-filled tube, which strongly suggests an increased hybridization between the nanotube pi states and the Er 5d orbitals. This was also evidenced by the conduction band response determined in C1s-x-ray absorption spectroscopy (XAS). These results have significant implications for the 1D electronic and magnetic properties of these and similar rare-earth nanowire hybrids.

    DOI: 10.1103/PhysRevB.83.085407

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  129. Thin-Film Transistors with Length-Sorted DNA-Wrapped Single-Wall Carbon Nanotubes Reviewed

    Yuki Asada, Yasumitsu Miyata, Kazunari Shiozawa, Yutaka Ohno, Ryo Kitaura, Takashi Mizutani, Hisanori Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 115 ( 1 ) page: 270 - 273   2011.1

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    The present experimental study provides a detailed characterization of the single-wall carbon nanotube (SWNT) length effect on the device characteristics of DNA-wrapped SWNT-network thin-film transistors (TFTs). DNA-assisted dispersion and length separation by high-performance liquid chromatography are used to prepare the SWNTs with average lengths of 400 and 200 rim. The TFTs of both SWNTs exhibit high on/off current ratios of 10(4)-10(6) and mobilities of 0.4-1.3 cm(2)/(Vs) by optimizing the film density of SWNTs. The optimized density of 200 nm SWNTs is found to be higher than that of 400 nm SWNTs as expected by the percolation theory of two-dimensional random networks, where shorter length SWNTs can maintain high on current despite increasing in the number of SWNT junctions. The present result is an important indicator for realizing high-performance TFTs constructed from SWNTs having desired length.

    DOI: 10.1021/jp107361n

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  130. Transformation of ionic liquid into carbon nanotubes in confined nanospace Reviewed

    Shimou Chen, Hong En Lim, Yasumitsu Miyata, Ryo Kitaura, Yoshio Bando, Dmitri Golberg, Hisanori Shinohara

    CHEMICAL COMMUNICATIONS   Vol. 47 ( 37 ) page: 10368 - 10370   2011

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    We have developed a two-step filling process for the nano-reaction of ionic liquid in a tip-closed SWNT, where fullerenes are inserted at the end of the host SWNT as a plug to prevent the leakage of the confined ionic liquid during heat treatment.

    DOI: 10.1039/c1cc14154f

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  131. Preferential synthesis and isolation of (6,5) single-wall nanotubes from one-dimensional C-60 coalescence Reviewed

    Jinying Zhang, Yasumitsu Miyata, Ryo Kitaura, Hisanori Shinohara

    NANOSCALE   Vol. 3 ( 10 ) page: 4190 - 4194   2011

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    The (6,5) single-wall carbon nanotubes have been preferentially synthesized from a one-dimensional array of C-60 inside single-wall carbon nanotubes (d congruent to 1.5 +/- 0.1 nm). The as-produced inner tubes have been extracted via sonication and density gradient ultracentrifugation methods and demonstrated to be dominated by (6,5) tubes by optical absorption, Raman scattering, photoluminescence, high-resolution transmission electron microscope observation, and a semi-empirical simulation (PM3).

    DOI: 10.1039/c1nr10602c

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  132. Nanohybridization of Polyoxometalate Clusters and Single-Wall Carbon Nanotubes: Applications in Molecular Cluster Batteries Reviewed

    Naoya Kawasaki, Heng Wang, Ryo Nakanishi, Shun Hamanaka, Ryo Kitaura, Hisanori Shinohara, Toshihiko Yokoyama, Hirofumi Yoshikawa, Kunio Awaga

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 50 ( 15 ) page: 3471 - 3474   2011

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    DOI: 10.1002/anie.201007264

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  133. Effect of efonidipine on TGF-β1-induced cardiac fibrosis through Smad2-dependent pathway in rat cardiac fibroblasts.

    Lei B, Hitomi H, Mori T, Nagai Y, Deguchi K, Mori H, Masaki T, Nakano D, Kobori H, Kitaura Y, Nishiyama A

    Journal of pharmacological sciences   Vol. 117 ( 2 ) page: 98 - 105   2011

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    DOI: 10.1254/jphs.11065fp

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  134. Scanning tunnelling spectroscopy on the local electronic structure of Gd@C-82 peapods Reviewed

    Kazunori Ohashi, Naoki Imazu, Ryo Kitaura, Hisanori Shinohara

    PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS   Vol. 247 ( 11-12 ) page: 3030 - 3032   2010.12

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    The electronic structure of Gd@C-82 metallofullerene peapods is studied experimentally by using scanning tunnelling microscopy and spectroscopy (STM and STS). The spatial modulation of the nanotube electronic structure induced by Gd@C-82 encapsulation has been observed depending on the position along the tube axis. Both STM and STS reveal a 1.2 nm periodicity which is consistent with the intermolecular distance of Gd@C-82 inside single-wall carbon nanotubes. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

    DOI: 10.1002/pssb.201000152

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  135. Solution-Phase Extraction of Ultrathin Inner Shells from Double-Wall Carbon Nanotubes Reviewed

    Yasumitsu Miyata, Marie Suzuki, Miho Fujihara, Yuki Asada, Ryo Kitaura, Hisanori Shinohara

    ACS NANO   Vol. 4 ( 10 ) page: 5807 - 5812   2010.10

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    We present an efficient method to extract inner shells of double-wall carbon nanotubes (DWCNTs) in liquid phase. The extraction of inner from outer shells is achieved by cutting the DWCNTs with vigorous sonication in water containing surfactants. The extracted shells are perfectly isolated single-wall carbon nanotubes (SWCNTs) and can be separated using density gradient ultracentrifugation. Statistical analysis using high-resolution transmission electron microscopy reveals that the enrichment of SWCNTs with narrow diameter (0.62-1.0 nm) up to 100% is achieved from highly pure DWCNTs. Furthermore, the (5,4) SWCNTs, which have the diameter of 0.62 nm, are concentrated. Our findings provide a novel way to obtain very narrow, highly isolated SWCNTs with ultraclean surface that have not been obtained in conventional synthesis methods.

    DOI: 10.1021/nn1015665

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  136. A layered ionic crystal of polar Li@C-60 superatoms Reviewed

    Shinobu Aoyagi, Eiji Nishibori, Hiroshi Sawa, Kunihisa Sugimoto, Masaki Takata, Yasumitsu Miyata, Ryo Kitaura, Hisanori Shinohara, Hiroshi Okada, Takeshi Sakai, Yoshihiro Ono, Kazuhiko Kawachi, Kuniyoshi Yokoo, Shoichi Ono, Kenji Omote, Yasuhiko Kasama, Shinsuke Ishikawa, Takashi Komuro, Hiromi Tobita

    NATURE CHEMISTRY   Vol. 2 ( 8 ) page: 678 - 683   2010.8

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    If the physical properties of C-60 fullerene molecules can be controlled in C-60 products already in use in various applications, the potential for industrial development will be significant. Encapsulation of a metal atom in the C-60 fullerene molecule is a promising way to control its physical properties. However, the isolation of C-60-based metallofullerenes has been difficult due to their insolubility. Here, we report the complete isolation and determination of the molecular and crystal structure of polar cationic Li@C-60 metallofullerene. The physical and chemical properties of Li@C-60 cation are compared with those of pristine C-60. It is found that the lithium cation is located at off-centre positions in the C-60-I-h cage interior and that the [Li+@C-60] salt has a unique two-dimensional structure. The present method of purification and crystallization of C-60-based metallofullerenes provides a new C-60 fullerene material that contains a metal atom.

    DOI: 10.1038/NCHEM.698

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  137. A simple alcohol-chemical vapor deposition synthesis of single-layer graphenes using flash cooling Reviewed

    Yasumitsu Miyata, Keiichi Kamon, Kazunori Ohashi, Ryo Kitaura, Masamichi Yoshimura, Hisanori Shinohara

    APPLIED PHYSICS LETTERS   Vol. 96 ( 26 )   2010.6

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    We report the synthesis of single-layer graphenes from ethanol using, what we call, "flash cooling" just after chemical vapor deposition. The single-layer graphenes synthesized are high-quality and several micrometers in grain size as revealed by Raman spectroscopy. Detailed comparison of the cooling processes suggests that the single-layer graphene growth does not occur during the carbon precipitation but rather stems from surface diffusions of carbon on a nickel substrate. Because of the present simple and easiness for the large-scale synthesis under an inert gas atmosphere and at atmospheric pressure, the present method can easily be applied for the future large-scale and low-cost graphene production. (C) 2010 American Institute of Physics. [doi:10.1063/1.3458797]

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  138. High-Performance Thin-Film Transistors with DNA-Assisted Solution Processing of Isolated Single-Walled Carbon Nanotubes Reviewed

    Yuki Asada, Yasumitsu Miyata, Yutaka Ohno, Ryo Kitaura, Toshiki Sugai, Takashi Mizutani, Hisanori Shinohara

    ADVANCED MATERIALS   Vol. 22 ( 24 ) page: 2698 - +   2010.6

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    Controlling the morphology of single-walled carbon nanotubes (SWNTs) is essential to realize their excellent device characteristics in electronics. DNA-wrapped SWNTs provides an effective, scalable way to fabricate the super-uniform networks of highly isolated, structure-sorted SWNTs for thin-film transistors (TFTs). The DNA-SWNTs are easily formed into uniform, desired-density networks of individual nanotubes.

    DOI: 10.1002/adma.200904006

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  139. Synthesis of Single-Walled Carbon Nanotubes Through Micropores of Surface-Treated Zeolites by Catalyst-Supported Chemical Vapor Deposition Reviewed

    Keita Kobayashi, Ryo Kitaura, Hisanori Shinohara

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   Vol. 10 ( 6 ) page: 3919 - 3923   2010.6

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    Cobalt nanoparticle-loaded Y-type zeolite (HSZ390HUA) without outer-surface Co aggregates is successfully prepared by Cc impregnation reaction followed by surface treatment using tetraethylammoniumbromide having larger molecule size than the orifice size of the Y-type zeolite. Single-wall carbon nanotubes (SWCNTs) have been synthesized by ethanol catalyst-supported chemical vapor deposition at 973 K for 10 min using as-produced and surface-treated Co-loaded zeolites. The SWCNTs synthesized are characterized by transmission electron microscopy, Raman spectroscopy and photoluminescence spectroscopy. The products synthesized by using the as-produced Co-loaded zeolites are mostly multi-wall carbon nanotubes (MWCNTs) with larger diameter than the orifice of zeolite and carbon nanocapsules (CNCs). In contrast, SWCNTs with diameters of 0.66-0.85 nm, which are approximately the same as that of the orifice size, are selectively synthesized by using the surface-treated Co-loaded zeolites.

    DOI: 10.1166/jnn.2010.1967

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  140. Incommensurate guest adsorption in bellows-shaped one-dimensional channels of porous coordination polymers Reviewed

    Ryotaro Matsuda, Ryo Kitaura, Yoshiki Kubota, Tatsuo C. Kobayashi, Masaki Takata, Susumu Kitagawa

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 129 ( 3 ) page: 296 - 303   2010.4

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    Adsorption isotherms of N(2), O(2), CO(2), and Xe on a flexible microporous coordination polymer, CPL-2 [Cu(2)(pzdc)(2)(bpy)]center dot(pzdc = pyrazine-2,3-dicarboxylate; bpy = 4,4&apos;-bipyridine), possessing bellows-shaped one-dimensional channels were measured. A nonintegral number of each of the N(2), O(2), CO(2), and Xe molecules can be accommodated in each unit pore, which indicates that all guest molecules are accommoda dated in the so-called "incommensurate fashion". in situ synchrotron X-ray powder diffraction patterns of CPL-2 with guest molecules were recorded. The unit cells were determined from each pattern. It Was found that the host CPL-2 exhibits different crystal transformation with the accommodation of each guest molecule. This indicates that, even in the case of incommensurate adsorption, the flexible framework of a microporous coordination polymer can transform each pore to suit different guest molecules. (C) 2009 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.micromeso.2009.06.023

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  141. Systematic Construction of Porous Coordination Pillared-layer Structures and Their Sorption Properties Reviewed

    Hirotoshi Sakamoto, Ryo Kitaura, Ryotaro Matsuda, Susumu Kitagawa, Yoshiki Kubota, Masaki Takata

    CHEMISTRY LETTERS   Vol. 39 ( 3 ) page: 218 - 219   2010.3

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    Two novel coordination polymers, {[Cu-2(pzdc)(2)L]center dot mH(2)O}n where pzdc is pyrazine-2,3-dicarboxylate and L is 2,7-diazapyrene (CPL-3) and 1,2-azopyridine (CPL-4), respectively, having 3D pillared-layer structure were prepared and the compounds showed gas adsorption properties depending on L.

    DOI: 10.1246/cl.2010.218

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  142. Various emetogens increase the secretion of salivary amylase in rats: a potential model in emesis research.

    Fukui H, Miwa E, Iwachido T, Kitaura H, Furukawa H

    Journal of pharmacological sciences   Vol. 113 ( 2 ) page: 143 - 52   2010

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    DOI: 10.1254/jphs.10037fp

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  143. 23aRA-10 Extraction and optical evaluation of ultra-thin single-wall carbon nanotubes

    Miyata Yasumitsu, Suzuki Marie, Fujihara Miho, Asada Yuki, Kitaura Ryo, Shinohara Hisanori

    Meeting Abstracts of the Physical Society of Japan   Vol. 65 ( 0 ) page: 774 - 774   2010

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    Publishing type:Research paper (scientific journal)   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.65.2.4.0_774_1

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  144. 25aRA-5 Structure and phase transition of lithium encapsulated C_<60> fullerene

    Aoyagi S., Sawa H., Nishibori E., Kitaura R., Okada H., Sakai T., Ono Y., Kasama Y., Tobita H., Shinohara H.

    Meeting Abstracts of the Physical Society of Japan   Vol. 65 ( 0 ) page: 813 - 813   2010

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    DOI: 10.11316/jpsgaiyo.65.2.4.0_813_3

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  145. Usefulness of carvedilol to abolish myocardial postsystolic shortening in patients with idiopathic dilated cardiomyopathy.

    Ito T, Kawanishi Y, Futai R, Terasaki F, Kitaura Y

    The American journal of cardiology   Vol. 104 ( 11 ) page: 1568 - 73   2009.12

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    DOI: 10.1016/j.amjcard.2009.07.028

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  146. Morphology and Melting Behavior of Ionic Liquids inside Single-Walled Carbon Nanotubes Reviewed

    Shimou Chen, Keita Kobayashi, Yasumitsu Miyata, Naoki Imazu, Takeshi Saito, Ryo Kitaura, Hisanori Shinohara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   Vol. 131 ( 41 ) page: 14850 - 14856   2009.10

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    We report the synthesis and characterization of single-walled carbon nanotubes (SWNTs) filled with a zinc-containing quaternary ammonium based ionic liquid (ChZnCl(3)) inside. The threshold SWNT diameter for efficient encapsulation was determined to be ca. 0.97 nm. Different morphologies of the encapsulated ChZnCl(3) such as single-chain, double-helix, zigzag tubes, and random tubes were observed. The melting of ChZnCl(3) ionic liquid into "nanofluid" inside SWNTs was investigated by in situ TEM electron beam irradiation and compared with a high-temperature heat treatment The thermal-decomposition temperature of the ChZnCl(3) ionic liquid confined in the SWNTs was much higher than in the bulk system Furthermore, the doping effect of the encapsulated ChZnCl(3) on the host SWNTs can be varied (from p-type to n-type) by gradually reducing the filling ratio. The versatility of ionic liquids and the unique phase transition observed inside the SWNTs provide a new opportunity for modulating the electronic properties of carbon nanotubes.

    DOI: 10.1021/ja904283d

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  147. STM TIP-CURRENT-INDUCED POLYMERIZATION OF C-60, Ce-2@C-80 AND Lu-2@C-76 Reviewed

    Kazunori Ohashi, Nobuyuki Fukui, Masahiro Akachi, Takao Akachi, Hisashi Umemoto, Yasuhiro Ito, Toshiki Sugai, Ryo Kitaura, Hisanori Shinohara

    NANO   Vol. 4 ( 5 ) page: 281 - 287   2009.10

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    Polymerization of C-60, Ce-2@C-80, and Lu-2@C-76 metallofullerenes induced by electron injection from a scanning tunneling microscope (STM) tip has been studied. C-60 polymerization has been observed only with C-60 multilayer on Au(111) and not with C-60 monolayer on Au(111). The Ce-2@C-80 metallofullerene on Si(111)-7 x 7 also polymerizes by electron injection but has less polymerization reactivity than C-60. Interestingly, the Lu-2@C-76 metallofullerene on Si(111)-7 x 7 does not show any polymerization. Based on these STM observations on the tip-induced polymerization, the direction of the bond formation and the dependence of reactivity on the kind of fullerenes are discussed.

    DOI: 10.1142/S1793292009001757

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  148. Suppression of inflammation in rat autoimmune myocarditis by S100A8/A9 through modulation of the proinflammatory cytokine network.

    Otsuka K, Terasaki F, Ikemoto M, Fujita S, Tsukada B, Katashima T, Kanzaki Y, Sohmiya K, Kono T, Toko H, Fujita M, Kitaura Y

    European journal of heart failure   Vol. 11 ( 3 ) page: 229 - 37   2009.3

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    DOI: 10.1093/eurjhf/hfn049

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  149. Fabrication of single-wall carbon nanotubes within the channels of a mesoporous material by catalyst-supported chemical vapor deposition Reviewed

    Keita Kobayashi, Ryo Kitaura, Yoko Kumai, Yastomo Goto, Shinji Inagaki, Hisanori Shinohara

    CARBON   Vol. 47 ( 3 ) page: 722 - 730   2009.3

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    Diameter-controlled single-wall carbon nanotubes (SWCNTs) have been synthesized using Co, Fe/Co and Rh/Pd alloy nanoparticles trapped within the one-dimensional channels of a mesoporous materials (Folded Sheets Mesoporous material: FSM-16) by catalyst-supported chemical vapor deposition (CCVD) using ethanol as carbon source at 973-1173 K. The SWCNTs synthesized are characterized by transmission electron microscopy, Raman spectroscopy and photoluminescence spectroscopy The yield, diameter distribution and quality of the SWCNTs strongly depend on the reaction temperature during CCVD. The product synthesized at 1173 K contains only SWCNTs, in marked contrast to those synthesized at lower temperatures. As the reaction temperature decreases, the relative abundance of multi-wall carbon nanotubes against SWCNTs significantly increases, whereas the mean diameter of SWCNTs increases as reaction temperature increases. The results show that a careful control of the reaction temperature is crucial to fabricate diameter-controlled SWCNTs from the channels of FSM-16. (C) 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbon.2008.11.011

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  150. Cluster hydration model for binding energy calculations of protein-ligand complexes.

    Murata K, Fedorov DG, Nakanishi I, Kitaura K

    The journal of physical chemistry. B   Vol. 113 ( 3 ) page: 809 - 17   2009.1

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    DOI: 10.1021/jp805007f

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  151. Hindered Rotation of Methane Molecules in the One-Dimensional Nanochannel of a Porous Coordination Polymer Reviewed

    Yoshiki Kubota, Masaki Takata, Ryo Kitaura, Ryotaro Matsuda, Tatsuo C. Kobayashi, Susumu Kitagawa

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   Vol. 9 ( 1 ) page: 69 - 76   2009.1

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    The crystal structure of a microporous coordination polymer with adsorbed methane gas was determined by in situ synchrotron powder diffraction of the gas adsorption and the MEM (maximum entropy method)/Rietveld method. Methane molecules were found to be adsorbed forming a one-dimensional array in the nanochannels of the polymer. The MEM charge density distribution of the adsorbed methane molecules indicated some protrusions which were not observed in that of a spherical atom of adsorbed argon. This was interpreted as a mixed distribution of two uniaxially rotating molecules with different pivotal axes. The methane molecules displayed hindered rotation depending on the shape of the nanopore surface. This result indicates the capability to control the molecular arrangement and orientation by the adsorption of gas molecules on the precisely designed nanopores of coordination polymers.

    DOI: 10.1166/jnn.2009.J085

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  152. *High-Yield Synthesis of Ultrathin Metal Nanowires in Carbon Nanotubes Reviewed

    Kitaura, R.Nakanishi, R.Saito, T.Yoshikawa, H.Awaga, K.Shinohara, H.

    Angewandte Chemie-International Edition   Vol. 48 ( 44 ) page: 8298-8302   2009

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  153. Chromatographic Length Separation and Photoluminescence Study on DNA-Wrapped Single-Wall and Double-Wall Carbon Nanotubes Reviewed

    Yuki Asada, Toshiki Sugai, Ryo Kitaura, Hisanori Shinohara

    JOURNAL OF NANOMATERIALS   Vol. 2009   2009

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    Water-soluble DNA-wrapped single-wall and double-wall carbon nanotubes (DNA-SWNTs, DNA-DWNTs) have been well separated by length incorporating size-exclusion high-performance liquid chromatography (HPLC). The morphology and electronic properties of the size- (length-) separated DNA-SWNTs and -DWNTs are investigated by atomic force microscopy (AFM), photoluminescence (PL), and Raman spectroscopy. By using length-separated DNA-SWNTs and -DWNTs, we have found that PL intensity of the DNA-SWNTs varies sensitively depending not only on the chirality (or diameter) but more importantly on the length of the hybrids. Copyright (C) 2009 Yuki Asada et al.

    DOI: 10.1155/2009/257892

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    Scopus

  154. Novel method for displaying left ventricular function and dyssynchrony using tissue Doppler imaging: evaluation of its applicability in dilated cardiomyopathy with wide and narrow QRS complexes.

    Ito T, Kawanishi Y, Tsukada B, Futai R, Terasaki F, Kanzaki Y, Suwa M, Kitaura Y

    Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography   Vol. 21 ( 11 ) page: 1236 - 43   2008.11

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    DOI: 10.1016/j.echo.2008.09.003

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  155. Bonding environment and electronic structure of Gd metallofullerene and Gd nanowire filled single-wall carbon nanotubes Reviewed

    T. Pichler, C. Kramberger, P. Ayala, H. Shiozawa, M. Knupfer, M. H. Ruemmeli, D. Batchelor, R. Kitaura, N. Imazu, K. Kobayashi, H. Shinohara

    PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS   Vol. 245 ( 10 ) page: 2038 - 2041   2008.10

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    Being single-walled carbon nanotubes, archetypical 1D systems with peculiar anisotropic electronic properties, it is possible to infer modifications in a controlled manner by filling their inner hollow space. One successful approach was proposed for Gd, which regards filling with metallofullerenes and a successful transformation into different novel metal and a successful transformation into different novel metal nanowires by a versatile nanochemical reaction. In this contribution we report on a combined high resolution photoemission and X-ray absorption study on Gd@C82 peapods and Gd nanowires.
    From a detailed analysis of the Gd 4d reponse and the valence band in photoemission we are able to elucidate the changes in the bonding environment and charge transfer in these 1D systems. We observe a clear modification of the low energy electronic properties of the SWCNT by the filling with Gd nanowires. Our findings provide important input to understand the interplay between charge transfer and hyridisation in the nanochemical processes in these hybrid systems and to elucidate their electronic transport properties regarding their application potential in nanoelectronic devices. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

    DOI: 10.1002/pssb.200879644

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  156. High Yield Synthesis and Characterization of the Structural and Magnetic Properties of Crystalline ErCl3 Nanowires in Single-Walled Carbon Nanotube Templates Reviewed

    Ryo Kitaura, Daisuke Ogawa, Keita Kobayashi, Takeshi Saito, Satoshi Ohshima, Tetsuya Nakamura, Hirofumi Yoshikawa, Kunio Awaga, Hisanori Shinohara

    NANO RESEARCH   Vol. 1 ( 2 ) page: 152 - 157   2008.8

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    Crystalline ErCl3 nanowires have been fabricated in single-walled carbon nanotubes (SWCNTs) with high yield (similar to 90%), and the structural and magnetic properties of the resulting ErCl3 nanowires encapsulated in SWCNTs (ErCl3@ SWCNTs) characterized. Encapsulation under high temperature and vacuum using high quality SWCNTs results in a high filling-ratio of ErCl3 nanowires in the SWCNTs. The high filling- ratio of ErCl3 nanowires and the use of highly pure SWCNTs with only a small amount of residual Fe catalyst nanoparticles enabled us to observe the magnetic properties of ErCl3@ SWCNTs. Structure determination based on simulated annealing calculations and high-resolution transmission electron microscope (HRTEM) image simulations revealed that the structure of the ErCl3 nanowires is unusual with respect to the coordination environment of the Eu3+ ions. This work opens up new possibilities to fabricate various metal complex nanowires with high yield and may also be of more general importance in understanding and exploring magnetic properties in low-dimensional magnetic systems.

    DOI: 10.1007/s12274-008-8013-8

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  157. Synthesis of single-wall carbon nanotubes grown from size-controlled Rh/Pd nanoparticles by catalyst-supported chemical vapor deposition Reviewed

    Keita Kobayashi, Ryo Kitaura, Yoko Kumai, Yasutomo Goto, Shinji Inagaki, Hisanori Shinohara

    CHEMICAL PHYSICS LETTERS   Vol. 458 ( 4-6 ) page: 346 - 350   2008.6

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    Single-wall carbon nanotubes (SWNTs) with a diameter range of 0.8-1.5 nm have been synthesized by using size-controlled Rh/Pd nanoparticles by catalyst-supported chemical vapor deposition (CCVD) at 1073 K. Nanoparticles of Rh/Pd with a diameter of similar to 3 nm have been prepared within a regular hexagonal arrayed one-dimensional channel of mesoporous silica, FSM-16. The SWNTs obtained by the CCVD using these catalysts have smaller diameter distribution compared to that of the catalyst nanoparticles, indicating that the diameter distribution of synthesized SWNTs has little relevance to the diameter of Rh/Pd catalyst nanoparticles. (c) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2008.05.016

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  158. Ab initio fragment molecular orbital study of ligand binding to human progesterone receptor ligand-binding domain.

    Harada T, Yamagishi K, Nakano T, Kitaura K, Tokiwa H

    Naunyn-Schmiedeberg's archives of pharmacology   Vol. 377 ( 4-6 ) page: 607 - 15   2008.6

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    DOI: 10.1007/s00210-008-0268-9

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  159. Element-specific magnetic properties of di-erbium Er-2@C-82 and Er2C2@C-82 metallofullerenes: A synchrotron soft X-ray magnetic circular dichroism study Reviewed

    Haruya Okimoto, Ryo Kitaura, Tetsuya Nakamura, Yasuhiro Ito, Yutaka Kitamura, Takao Akachi, Daisuke Ogawa, Naoki Imazu, Yuko Kato, Yuki Asada, Toshiki Sugai, Hitoshi Osawa, Tomohiro Matsushita, Takayuki Muro, Hisanori Shinohara

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 112 ( 15 ) page: 6103 - 6109   2008.4

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    The magnetic properties of mono- and dierbium(Er) metallofullerenes have been studied by means of a synchrotron soft X-ray magnetic circular dichroism (SXMCD) technique. The effective magnetic moment of the Er ions has been estimated to be 8.48 mu(B) and is independent of the number of Er ions encapsulated inside the fullerene cage. These Er metallofullerenes exhibit an anti ferromagnetic-like behavior at low temperatures that is stronger in Er@C-82(C-2 nu isomer) monometallofullerene than in Er-2@C-82(C-2 nu) and Er2C2@C-82(C-2 nu) dimetallofullerenes. The result suggests that the unpaired spin on the monometallofullerene cages causes an indirect magnetic interaction between Er 4f spins of neighboring metallofullerenes. Furthermore, we have found that the Weiss temperatures of the metallofullerene remain the same even when one of the Er ions in Er2C2@C-82(C-s) is replaced by a nonmagnetic Y ion (i.e., ErYC2@C-82). The results indicate that interaction between the two Er ions in the same fullerene cage does not contribute significantly to the overall magnetic properties.

    DOI: 10.1021/jp711776j

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  160. Effect of left ventricular dyssynchrony on plasma B-type natriuretic peptide levels in patients with long-term right ventricular apical pacing.

    Kawanishi Y, Ito T, Suwa M, Terasaki F, Futai R, Kitaura Y

    International heart journal   Vol. 49 ( 2 ) page: 165 - 73   2008.3

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    DOI: 10.1536/ihj.49.165

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  161. Solid-state (13)c and Sc-45 nmr studies on endohedral scandium-carbide metallofullerenes: A motional dynamics of Sc atoms in fullerenes Reviewed

    Haruya Okimoto, Wilhelm Hemme, Yasuhiro Ito, Toshiki Sugai, Ryo Kitaura, Hellmut Eckert, Hisanori Shinohara

    NANO   Vol. 3 ( 1 ) page: 21 - 25   2008.2

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    Sc2C2@C-82(II) and Sc2C2@C-82(III) have been synthesized and chromatographically isolated and characterized by using UV-Vis-NIR absorption spectroscopy. Solid-state C-13 and Sc-45 NMR on Sc2C2@C-82 metallofullerenes provide the rotational activation energy of Sc atoms encapsulated in C-82 fullerenes which is lower than that in solution due to crystal field effects on the rate of the rotation.

    DOI: 10.1142/S1793292008000794

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  162. Solid-state (13)c and Sc-45 nmr studies on endohedral scandium-carbide metallofullerenes: A motional dynamics of Sc atoms in fullerenes

    Okimoto Haruya, Hemme Wilhelm, Ito Yasuhiro, Sugai Toshiki, Kitaura Ryo, Eckert Hellmut, Shinohara Hisanori

    NANO   Vol. 3 ( 1 ) page: 21 - 25   2008.2

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  163. *Fabrication of metal nanowires in carbon nanotubes via versatile nano-template reaction Reviewed

    Kitaura, R.Imazu, N.Kobayashi, K.Shinohara, H.

      Vol. 8 ( 2 ) page: 693-699   2008

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  164. Enhanced 1520 nm photoluminescence from Er3+ ions in di-erbium-carbide metallofullerenes (Er2C2)@C-82 (isomers I, II, and III) Reviewed

    Yasuhiro Ito, Toshiya Okazaki, Shingo Okubo, Masahiro Akachi, Yutaka Ohno, Takashi Mizutani, Tetsuya Nakamura, Ryo Kitaura, Toshiki Sugai, Hisanori Shinohara

    ACS NANO   Vol. 1 ( 5 ) page: 456 - 462   2007.12

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    Di-erbium and di-erbium-carbide endohedral metallofullerenes with a C-82, cage such as Er-2@C-82 (isomers I, II, and III) and (Er2C2)@C-82 (isomers I, II, and III) have been synthesized and chromatographically isolated (99%). The structures of Er-2@C-82 (I II, III) and (Er2C2)@C-82 (I, II, III) metallofullerenes are characterized by comparison with the UV-vis- NIR absorption spectra of (Y2C2)@C-82 (I, II, III), where molecular symmetries of the structures are determined to be C-s, C-2v and C-3v, respectively. Furthermore, enhanced near-infrared photoluminescence (PL) at 1520 nm from Er3+ ions in Er-2@C-2 (I, III) and (Er2C2)@C-82 (I, III) have been observed at room temperature. The PL intensities have been shown to depend on the symmetry of the C-82 cage. In particular, the PL. intensity of (Er2C2)@C-82 (III) has been the strongest among the isomers of Er-2@C-82 and (Er2C2)@C-82. optical measurements indicate that the PL properties of Er-2@C-82 (I, II, III) and (Er2C2)@C-82 (I, II III) correlate strongly with the absorbance at 1520 nm and the HOMO-LUMO energy gap of the C-82 cage.

    DOI: 10.1021/nn700235z

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    PubMed

  165. Magnetism of the endohedral metallofullerenes M@C(82) (M=Gd,Dy) and the corresponding nanoscale peapods: Synchrotron soft x-ray magnetic circular dichroism and density-functional theory calculations Reviewed

    R. Kitaura, H. Okimoto, H. Shinohara, T. Nakamura, H. Osawa

    PHYSICAL REVIEW B   Vol. 76 ( 17 )   2007.11

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    Synchrotron soft x-ray magnetic circular dichroism (SXMCD) spectroscopy at the Gd and Dy M(5) edges is reported on endohedral metallofullerenes (M@C(82), M=Gd and Dy) and the corresponding nanopeapods [(M@C(82))@SWNT, SWNT represents single wall carbon nanotube] in a temperature range between 10 and 40 K. The magnetic moment has also been determined by theoretical calculations, which are based on the Hartree-Fock approximation with relativistic corrections. Because of the element-specific measurement of SXMCD, magnetization processes of Gd and Dy ions of nanopeapods have been selectively observed. The temperature dependence of magnetic moments of the metallofullerenes and nanopeapods follows the Curie-Weiss law with a small Weiss temperature, indicating that the magnetic interaction between encapsulated rare-earth metal atoms is relatively weak. Although the observed differences in Curie constants and Weiss temperatures between Gd@C(82) and (Gd@C(82))@SWNT are small, those of Dy@C(82) and (Dy@C(82))@SWNT are significant. This observation is consistently explained by charge transfer-induced crystal-field effects.

    DOI: 10.1103/PhysRevB.76.172409

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  166. Synthesis and spectroscopic characterization of salmon DNA-wrapped single-wall carbon nanotubes Reviewed

    Yuki Asada, Hirofumi Dohi, Shota Kuwahara, Toshiki Sugai, Ryo Kitaura, Hisanori Shinohara

    NANO   Vol. 2 ( 5 ) page: 295 - 299   2007.10

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    Single-wall carbon nanotubes (SWNTs) can be well-dispersed in water by wrapping with short segments of natural DNA from salmon sperm. We report here the isolated DNA-wrapped SWNT hybrids. Measurements were carried out using UV-vis-NIR, near-infrared photoluminescence (PL) spectrum and atomic force microscopy (AFM). A possible charge transport between SWNTs and salmon-DNA is discussed in terms of observed spectral shifts in the photoluminescence spectra.

    DOI: 10.1142/S1793292007000672

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  167. Synthesis and spectroscopic characterization of salmon DNA-wrapped single-wall carbon nanotubes

    Asada Yuki, Dohi Hirofumi, Kuwahara Shota, Sugai Toshiki, Kitaura Ryo, Shinohara Hisanori

    NANO   Vol. 2 ( 5 ) page: 295 - 299   2007.10

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  168. Functional analysis of activating receptor LMIR4 as a counterpart of inhibitory receptor LMIR3.

    Izawa K, Kitaura J, Yamanishi Y, Matsuoka T, Oki T, Shibata F, Kumagai H, Nakajima H, Maeda-Yamamoto M, Hauchins JP, Tybulewicz VLJ, Takai T, Kitamura T

    The Journal of biological chemistry   Vol. 282 ( 25 ) page: 17997 - 18008   2007.6

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    DOI: 10.1074/jbc.M701100200

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  169. Synthesis, enhanced stability and structural imaging of C-60 and C-70 double-wall carbon nanotube peapods Reviewed

    Guoqing Ning, Naoki Kishi, Haruya Okimoto, Masahiro Shiraishi, Yuko Kato, Ryo Kitaura, Toshiki Sugai, Shinobu Aoyagi, Eiji Nishibori, Makoto Sakata, Hisanori Shinohara

    CHEMICAL PHYSICS LETTERS   Vol. 441 ( 1-3 ) page: 94 - 99   2007.6

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    Double-wall carbon nanotubes (DWNTs) encapsulating C-60 and C-70 fullerenes have been synthesized by the vapor reaction method. Arrangements of C-60 and C-70 molecules in phases of single chain and multi-layers are observed in DWNTs of different sizes by TEM observation. Distinct signals of XRD patterns and Raman spectra can distinguish C-60 and C-70 fullerenes inside from those attached outside DWNTs. TGA of the as-prepared DWNT-peapods clearly show that they have a higher thermal stability in comparison with pristine DWNTs. This supplies a simple method to evaluate the filling ratio of peapods, which is 74.7 wt% for the current DWNT-peapods. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2007.04.073

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  170. Synthesis, enhanced stability and structural imaging of C-60 and C-70 double-wall carbon nanotube peapods Reviewed

    Ning G (Ning, Guoqing), Kishi N (Kishi, Naoki), Okimoto H (Okimoto, Haruya), Shiraishi M (Shiraishi, Masahiro), Kato Y (Kato, Yuko), Kitaura R (Kitaura, Ryo), Sugai T (Sugai, Toshiki), Aoyagi S (Aoyagi, Shinobu), Nishibori E (Nishibori, Eiji), Sakata M (Sakata, Makoto), Shinohara H (Shinohara, Hisanori)

    CHEMICAL PHYSICS LETTERS   Vol. 441 ( 1-3 ) page: 94-99   2007.5

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  171. カーボンナノチュブ研究開発の現状と展望

    北浦 良, 篠原 久典

    電気化学および工業物理化学 : denki kagaku   Vol. 75 ( 4 ) page: 366 - 370   2007.4

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    Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 電気化学会  

    DOI: 10.5796/electrochemistry.75.366

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  172. Raman spectroscopy of size-selected linear polyyne molecules C2nH2 (n=4-6) encapsulated in single-wall carbon nanotubes Reviewed

    Nishide D, Wakabayashi T, Sugai T, Kitaura R, Kataura H, Achiba Y, Shinohara H

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 111 ( 13 ) page: 5178 - 5183   2007.4

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    DOI: 10.1021/jp0686442

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  173. Raman spectroscopy of size-selected linear polyyne molecules C2nH2 (n=4-6) encapsulated in single-wall carbon nanotubes Reviewed

    Nishide D (Nishide, D.), Wakabayashi T (Wakabayashi, T.), Sugai T (Sugai, T.), Kitaura R (Kitaura, R.), Kataura H (Kataura, H.), Achiba Y (Achiba, Y.), Shinohara H (Shinohara, H.)

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 111 ( 13 ) page: 5178-5183   2007.4

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  174. Depressed myocardial contractile reserve in patients with obstructive sleep apnea assessed by tissue Doppler imaging with dobutamine stress echocardiography.

    Okuda N, Ito T, Emura N, Suwa M, Hayashi T, Yoneda H, Kitaura Y

    Chest   Vol. 131 ( 4 ) page: 1082 - 9   2007.4

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    DOI: 10.1378/chest.06-2444

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  175. Endohedral Metallofullerenes and Nano-Peapods

    Kitaura Ryo, Shinohara Hisanori

    Japanese journal of applied physics. Pt. 1, Regular papers & short notes   Vol. 46 ( 3 ) page: 881 - 891   2007.3

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  176. Endohedral metallofullerenes and nano-peapods Reviewed

    R. Kitaura, H. Shinohara

    Jpn. J. App. Phys.   Vol. 46   page: 881-891   2007.3

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  177. Endohedral metallofullerenes and nano-peapods Reviewed

    Ryo Kitaura, Hisanori Shinohara

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   Vol. 46 ( 3A ) page: 881 - 891   2007.3

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    In this review article, we deal with the structures and properties of novel hybrid nanocarbon materials, which are created by the incorporation of atoms and molecules in hollow spaces of fullerenes and carbon nanotubes (CNTs); these hybrid materials are called endohedral metallofullerenes (in the case of metal atom incorporated fullerenes) and nano-peapods, respectively. Synthesis procedures, structural characterizations by synchrotron powder x-ray diffraction, electronic structures, and magnetic properties of endohedral metallofullerenes are discussed. The structure and properties of nano-peapods by high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS), scanning tunneling microscopy (STM) and field effect transistor (FET) transport measurements together with their synthesis procedures are described. The utilization of the low-dimensional nanosized spaces of CNTs to produce novel low-dimensional nanocluster, nanowire and nano-tube materials is also discussed.

    DOI: 10.1143/JJAP.46.881

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  178. *Magnetism of the endohedral metallofullerenes M@C-82 (M=Gd,Dy) and the corresponding nanoscale peapods: Synchrotron soft x-ray magnetic circular dichroism and density-functional theory calculations Reviewed

    Kitaura, R.Okimoto, H.Shinohara, H.Nakamura, T.Osawa, H.

      Vol. 76 ( 17 )   2007

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  179. Carbon-nanotube-based hybrid materials: Nanopeapods Reviewed

    R. Kitaura, H. Shinohara

    Chemistry-An Asian J.   Vol. 1 ( 5 ) page: 646-655   2006.11

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  180. Carbon-nanotube-based hybrid materials: Nanopeapods Reviewed

    Ryo Kitaura, Hisanori Shinohara

    CHEMISTRY-AN ASIAN JOURNAL   Vol. 1 ( 5 ) page: 646 - 655   2006.11

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    This review article focuses on the structures and properties of novel hybrid nanocarbon materials, which are created by incorporating atoms and molecules into the hollow spaces of carbon nanotubes (CNTs); thus they are called nanopeapods. After dealing with synthesis procedures, we discuss the structures and electronic properties of the hybrid materials based on high-resolution transmission electron microscopy (HRTEM), electron energy-loss spectroscopy (EELS), X-ray and electron diffraction, scanning, tunneling microscopy (STM), and field-effect transistor transport measurements. Utilization of the low-dimensional nanosized spaces of CNTs to produce novel low-dimensional nanocluster, nanowire, and nanotube materials is also discussed.

    DOI: 10.1002/asia.200600162

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  181. Functionalities of one-dimensional dynamic ultramicropores in nickel(II) coordination polymers Reviewed

    Noro SI (Noro, Shin-ichiro), Kitaura R (Kitaura, Ryo), Kitagawa S (Kitagawa, Susumu), Akutagawa T (Akutagawa, Tomoyuki), Nakamura T (Nakamura, Takayoshi)

    Inorg. Chem.   Vol. 45 ( 22 ) page: 8990-8997   2006.10

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  182. Functionalities of one-dimensional dynamic ultramicropores in nickel(II) coordination polymers Reviewed

    Shin-ichiro Noro, Ryo Kitaura, Susumu Kitagawa, Tomoyuki Akutagawa, Takayoshi Nakamura

    INORGANIC CHEMISTRY   Vol. 45 ( 22 ) page: 8990 - 8997   2006.10

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    Ni(II) coordination polymers with a 4,4 &apos;-azobis(pyridine) (azpy) ligand, {[Ni(2)(NCX)(4)(azpy)(4)]center dot G}(n) (X = S, G (guest molecule) = MeOH (1 center dot MeOH); X = S, G = EtOH (1 center dot EtOH); X = S, G = H(2)O (1 center dot H(2)O); X = S, G = no guest (1); X = Se, G = MeOH (2 center dot MeOH); X = Se, G = H(2)O (2 center dot H(2)O); X = Se, G = no guest ( 2)), have been synthesized and structurally characterized with their porosity. These compounds have one-dimensional periodic ultramicropores that contain the small guest molecules, H(2)O, MeOH, or EtOH, whose hydroxy groups interact with the S or Se atoms of isothiocyanate or isoselenocyanate, respectively, via-S(Se)center dot center dot center dot HO-hydrogen bonds. Although the molecular dimensions of the MeOH guest are considerably larger than the window size of the ultramicropore, 1, MeOH and 2, MeOH easily release their guest molecules without decomposition of the framework to form 1 and 2 without any guest molecules. This shows that 1 and 2 have dynamic ultramicropores constructed from the interpenetrating framework. The guest desorption experiments using 1 center dot MeOH and 1 center dot EtOH reveal that the difference in the desorption behavior is due to van der Waals interactions that depend on the molecular shape of the guest molecule in the ultramicropores and/or an entrance blocking effect that depends on the minimum dimensions of the guest molecule for the pore windows. A marked difference in the N(2) and CH(4) adsorption isotherms was observed and is associated with the strength of the host-guest interaction.

    DOI: 10.1021/ic061052d

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  183. Single-wall carbon nanotubes encaging linear chain C10H2 polyyne molecules inside Reviewed

    Daisuke Nishide, Hirofumi Dohi, Tomonari Wakabayashi, Eiji Nishibori, Shinobu Aoyagi, Masashi Ishida, Satoshi Kikuchi, Ryo Kitaura, Toshiki Sugai, Makoto Sakata, Hisanori Shinohara

    CHEMICAL PHYSICS LETTERS   Vol. 428 ( 4-6 ) page: 356 - 360   2006.9

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    A new hybrid material C10H2@SWNTs, single-wall carbon nanotubes (SWNTs) encapsulating C10H2 polyyne molecules, has been synthesized and confirmed by Raman spectroscopy and X-ray diffraction measurement. The C10H2 polyyne molecules composed of linearly bonded sp-carbon atoms are aligned inside the SWNTs. This hybrid material exhibits a characteristic Raman signal at 2066 cm(-1) attributable to the stretching vibration of the C10H2 molecules interacting with SWNTs. Being trapped inside the SWNTs, the otherwise unstable C10H2 molecules are shown to be stable well above 300 degrees C under dry-air conditions. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2006.07.016

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  184. Single-wall carbon nanotubes encaging linear chain C10H2 polyyne molecules inside Reviewed

    Nishide D (Nishide, Daisuke), Dohi H (Dohi, Hirofumi), Wakabayashi T (Wakabayashi, Tomonari), Nishibori E (Nishibori, Eiji), Aoyagi S (Aoyagi, Shinobu), Ishida M (Ishida, Masashi), Kikuchi S (Kikuchi, Satoshi), Kitaura R (Kitaura, Ryo), Sugai T (Sugai, Toshiki), Sakata M (Sakata, Makoto), Shinohara H (Shinohara, Hisanori)

    Chemical Physics Letters   Vol. 428 ( 4-6 ) page: 356-360   2006.9

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  185. Regional postsystolic shortening in patients with hypertrophic cardiomyopathy: its incidence and characteristics assessed by strain imaging.

    Ito T, Suwa M, Tonari S, Okuda N, Kitaura Y

    Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography   Vol. 19 ( 8 ) page: 987 - 93   2006.8

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    DOI: 10.1016/j.echo.2006.03.019

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  186. DFTB energy decomposition analysis of interactions in Fullerene@SWNT nanopeapods

    Wang Zhi, Irle Stephan, Zheng Guishan, Morokuma Keiji, Kitaura Ryo, Shinohara Hisanori

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   Vol. 231   2006.3

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  187. DFTB energy decomposition analysis of interactions in Fullerene@SWNT nanopeapods Reviewed

    Wang Z (Wang, Zhi), Irle S (Irle, Stephan), Zheng GS (Zheng, Guishan), Morokuma K (Morokuma, Keiji), Kitaura R (Kitaura, Ryo), Shinohara H (Shinohara, Hisanori)

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   Vol. 231   page: 263   2006.3

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  188. DFTB energy decomposition analysis of interactions in Fullerene@SWNT nanopeapods Reviewed

    Zhi Wang, Stephan Irle, Guishan Zheng, Keiji Morokuma, Ryo Kitaura, Hisanori Shinohara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   Vol. 231   2006.3

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  189. Nanochannel-promoted polymerization of substituted acetylenes in porous coordination polymers Reviewed

    Uemura T, Kitaura R, Ohta Y, Nagaoka M, Kitagawa S

    Angew. Chem. Int. Ed.   Vol. 45 ( 25 ) page: 4112-4116   2006

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  190. Metastable sorption state of a metal-organic porous material determined by in situ synchrotron powder diffraction Reviewed

    Kubota Y (Kubota, Yoshiki), Takata M (Takata, Masaki), Matsuda R (Matsuda, Ryotaro), Kitaura R (Kitaura, Ryo), Kitagawa S (Kitagawa, Susumu), Kobayashi TC (Kobayashi, Tatsuo C.)

    Angew. Chem. Int. Ed.   Vol. 45 ( 30 ) page: 4932-4936   2006

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  191. Metastable sorption state of a metal-organic porous material determined by in situ synchrotron powder diffraction Reviewed

    Yoshiki Kubota, Masaki Takata, Ryotaro Matsuda, Ryo Kitaura, Susumu Kitagawa, Tatsuo C. Kobayashi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 45 ( 30 ) page: 4932 - 4936   2006

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    DOI: 10.1002/anie.200600976

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  192. Nanochannel-promoted polymerization of substituted acetylenes in porous coordination polymers Reviewed

    Takashi Uemura, Ryo Kitaura, Yusuke Ohta, Masataka Nagaoka, Susumu Kitagawa

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 45 ( 25 ) page: 4112 - 4116   2006

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    DOI: 10.1002/anie.200600333

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  193. Magnetic properties of molecular oxygen adsorbed in micro-porous metal-organic solids Reviewed

    Tatsuo C. Kobayashi, Akira Matsuo, Megumi Suzuki, Koichi Kindo, Ryo Kitaura, Ryotaro Matsuda, Susumu Kitagawa

    Progress of Theoretical Physics Supplement   Vol. 159 ( 159 ) page: 271 - 279   2005.12

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    The magnetic properties of O2adsorbed in nanochannels of porous metal-organic solids CPL-1 and CPL-pl have been investigated by means of high-field magnetization process measurement. The contribution from adsorbed O2shows the metamagnetic-like behavior in both compounds. We propose &quot;the field-induced rearrangement mechanism&quot; as the explanation for the metamagnetic-like behavior. It is known for the O2-O2dimer that the magnetic interaction depends strongly on the intermolecular distance and the orientation of molecular axes. It is considered naturally that the stable arrangement with saturated magnetic moment in the sufficient high field is different from the H-structure which is stable at zero field.

    DOI: 10.1143/PTPS.159.271

  194. Comparative study of quantitative blood pool SPECT imaging with 180 degrees and 360 degrees acquisition orbits on accuracy of cardiac function.

    Adachi I, Umeda T, Shimomura H, Suwa M, Komori T, Ogura Y, Utsunomiya K, Kitaura Y, Narabayashi I

    Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology   Vol. 12 ( 2 ) page: 186 - 94   2005.3

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    DOI: 10.1016/j.nuclcard.2004.10.004

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  195. Ab initio quantum mechanical study of the binding energies of human estrogen receptor alpha with its ligands: an application of fragment molecular orbital method.

    Fukuzawa K, Kitaura K, Uebayasi M, Nakata K, Kaminuma T, Nakano T

    Journal of computational chemistry   Vol. 26 ( 1 ) page: 1 - 10   2005.1

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    DOI: 10.1002/jcc.20130

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  196. Direct Observation of Hydrogen Molecules Adsorbed onto a Microporous Coordination Polymer Reviewed

    Y. Kubota, M. Takata, R. Matsuda, R. Kitaura, S. Kitagawa, K. Kato, M. Sakata, T. C. Kobayashi

    Angewandte Chemie International Edition   Vol. 44 ( 6 ) page: 920 - 923   2005.1

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    DOI: 10.1002/anie.200461895

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  197. Formation and characterization of crystalline molecular arrays of gas molecules in a 1-dimensional ultramicropore of a porous copper coordination polymer. Reviewed

    Kitaura, R.; Matsuda, R.; Kubota, Y.; Kitagawa, S.; Takata, M.; Kobayashi, T. C.; Suzuki

    J. Phys. Chem. B.   Vol. 109 ( 49 ) page: 23378-23385   2005

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  198. *Highly controlled acetylene accommodation in a metal-organic microporous material. Reviewed

    Matsuda, R.; Kitaura, R.; Kitagawa, S.; Kubota, Y.; Belosludov, R. V.; Kobayashi, T. C.; Sakamoto, H.; Chiba, T.; Takata, M.; Kawazoe, Y.; Mita, Y.

    Nature   Vol. 436 ( 7048 ) page: 238-241   2005

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  199. Magnetic properties of molecular oxygen adsorbed in micro-porous metal-organic solids. Reviewed

    Kobayashi, T. C.; Matsuo, A.; Suzuki, M.; Kindo, K.; Kitaura, R.; Matsuda, R.; Kitagawa, S.

    Progress of Theoretical Physics Supplement.   Vol. 159   page: 271-279   2005

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  200. 27pYK-1 Direct observation of hydrogen molecules adsorbed onto a microporous coordination polymer

    Kubota Yoshiki, Takata Masaki, Matsuda Ryotaro, Kitaura Ryo, Kitagawa Susumu, Kobayashi Tatsuo, Kato Kenichi, Sakata Makoto

    Meeting Abstracts of the Physical Society of Japan   Vol. 60 ( 0 ) page: 822 - 822   2005

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    DOI: 10.11316/jpsgaiyo.60.1.4.0_822_1

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  201. Direct Observation of Hydrogen Molecules adsorbed in a Coordination Polymer

    Kubota Yoshiki, Takata Masaki, Matsuda Ryotaro, Kitaura Ryo, Kitagawa Susumu, Kobayashi Tatsuo C., Kato Kenichi, Sakata Makoto

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES   Vol. 61   page: C403 - C403   2005

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  202. Motion of methanol adsorbed in porous coordination polymer with paramagnetic metal ions Reviewed

    Satoshi Horike, Ryotaro Matsuda, Ryo Kitaura, Susumu Kitagawa, Takahiro Iijima, Kazunaka Endo, Yoshiki Kubota, Masaki Takata

    Chemical Communications   Vol. 10 ( 19 ) page: 2152 - 2153   2004.11

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    Molecular motions of methanol adsorbed in 1D nano-channels of pillared-layer coordination polymer with paramagnetic metal ions have been studied by 2H NMR together with X-ray crystallography.

    DOI: 10.1039/b406883a

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    J-GLOBAL

  203. Guest shape-responsive fitting of porous coordination polymer with shrinkable framework Reviewed

    R Matsuda, R Kitaura, S Kitagawa, Y Kubota, TC Kobayashi, S Horike, M Takata

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   Vol. 126 ( 43 ) page: 14063 - 14070   2004.11

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    In situ synchrotron X-ray powder diffraction patterns of porous coordination polymers {[Cu-2-(pzdc)(2)(bpy)](.)G} have been measured (pzdc = pyrazine-2,3-dicarboxylate, bpy = 4,4'-bipyridine) (where G = H2O for CPL-2 superset of H2O, G = benzene for CPL-2 superset of benzene, and G = void for the apohost). The structures of apohost and CPL-2 superset of benzene were determined from Rietveld analysis. Adsorption of benzene in the channels induced a remarkable contraction in the crystal (b axis; 6.8%, volume; 4.9%), although the channels were occupied by the benzene molecules. This crystal transformation provides a new pore structure that is well suited for benzene molecules, and we denote it as a "shape-responsive fitting" transformation. This type of pore gives rise to a new guideline: frameworks can be composed of flexible motifs that are linked via strong bond and/or stiff motifs that are connected via weaker bonds.

    DOI: 10.1021/ja046925m

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  204. Rational design and crystal structure determination of a 3-D metal-organic jungle-gym-like open framework Reviewed

    Ryo Kitaura, Fumiyasu Iwahori, Ryotaro Matsuda, Susumu Kitagawa, Yoshiki Kubota, Masaki Takata, Tatsuo C. Kobayashi

    Inorganic Chemistry   Vol. 43 ( 21 ) page: 6522 - 6524   2004.10

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    A new three-dimensional (3-D) jungle-gym-like open metal-organic framework has been synthesized from a two-dimensional (2-D) layer compound using a heterogeneous pillar insertion reaction. Both the starting 2-D layer and the resulting 3-D open compounds have been characterized using X-ray crystallography.

    DOI: 10.1021/ic049005d

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    J-GLOBAL

  205. Metal-complex assemblies constructed from the flexible hinge-like ligand H(2)bhnq: Structural versatility and dynamic behavior in the solid state

    K Yamada, S Yagishita, H Tanaka, K Tohyama, K Adachi, S Kaizaki, H Kumagai, K Inoue, R Kitaura, HC Chang, S Kitagawa, S Kawata

    CHEMISTRY-A EUROPEAN JOURNAL   Vol. 10 ( 11 ) page: 2647 - 60   2004.6

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    DOI: 10.1002/chem.200305640

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  206. Immobilization of a metallo Schiff base into a microporous coordination polymer Reviewed

    Ryo Kitaura, Goro Onoyama, Hirotoshi Sakamoto, Ryotaro Matsuda, Sin Ichiro Noro, Susumu Kitagawa

    Angewandte Chemie - International Edition   Vol. 43 ( 20 ) page: 2684 - 2687   2004.5

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    Wall decoration: Coordinatively unsaturated metal centers (CuII, CoII, and NiII) can be embedded in the pore wall of a microporous coordination polymer containing Schiff base type metalloligands [M(salphdc)]2- (H4salphdc = N,N′-o- phenylenebis(salicylideneimine-5,5′-dicarboxylic acid)). These coordination polymers possess large 1D channels with dimensions of approximately 14 × 14 ?2 (see structure).

    DOI: 10.1002/anie.200352596

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  207. Magnetism of a one-dimensional array of oxygen in a micro-porous metal-organic solid Reviewed

    A. Matsuo, T. C. Kobayashi, M. Suzuki, K. Kindo, R. Kitaura, R. Matsuda, H. -C. Chang, S. Kitagawa

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 272   page: E643 - E645   2004.5

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    The magnetic properties of molecular oxygen adsorbed in the micro-porous metal-organic solids have been investigated. Adsorbed O-2 molecules form a ladder structure in the nanochannels of CPL-1. The temperature dependence of susceptibility and the high-field magnetization process indicate the nonmagnetic ground state of the adsorbed O-2 at low temperatures. (C) 2003 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.11.327

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  208. A Flexible Open Framework which Displays Shape-Responsible Fitting Based on Shrinking. Reviewed

    R, Matsuda.; R, Kitaura.; S, Kitagawa.; Y, Kubota.; T, Kobayashi.; S, Horike.; M, Takata.

    J. Am. Chem. Soc.   Vol. 43   page: 14063-14070   2004

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  209. Rational Design and Crystal Structure Determination of 3-D Metal-Organic Jungle-Gym like Open framework. Reviewed

    R, Kitaura.; F, Iwahori.; R, Matsuda.; S, Kitagawa.; Y, Kubota.; M, Takata.; T, Kobayashi.

    Inorg. Chem.   Vol. 43 ( 21 ) page: 6522-6524   2004

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  210. Immobilization of metallo-Schiff-base into Microporous Coordination Polymer. Reviewed

    R,_Kitaura.; G, Onoyama.; H, Sakamoto.; R, Matsuda.; S, Noro.; S, Kitagawa.

    Angew. Chem. Int. Ed.   Vol. 43   page: 2684-2687   2004

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  211. 配位高分子を用いたナノ空間の機能化学 Invited Reviewed

    北浦良

    化学と工業   Vol. 157 ( 2 ) page: 99-   2004

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  212. Functional Porous Coordination Polymers. Reviewed

    S, Kitagawa.; R, Kitaura.; S, Noro.

    Angew. Chem. Int. Ed.   Vol. 43   page: 2334-2375   2004

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  213. Motion of Methanol Adsorbed in Porous Coordination Polymers with Paramagnetic Metal ions. Reviewed

    S, Horike.; R, Matsuda.; R, Kitaura.; S, Kitagawa.; T, Iijima.; K, Endo.; Y, Kubota.; T, Kobayashi.; M, Takata.

    Chem. Commun.     page: 2152-2153   2004

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  214. Gated blood pool SPECT improves reproducibility of right and left ventricular Fourier phase analysis in radionuclide angiography.

    Adachi I, Akagi H, Umeda T, Suwa M, Komori T, Ogura Y, Utsunomiya K, Kitaura Y, Narabayashi I

    Annals of nuclear medicine   Vol. 17 ( 8 ) page: 711 - 6   2003.12

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    DOI: 10.1007/BF02984981

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  215. 酸素分子が一列に並んだ!─多孔性配位高分子を用いた新しいナノサイエンス Invited

    北浦良、北川進

    月刊化学     2003.7

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  216. Porous Coordination Polymer Crystals with Gated-Channels Specific for Supercritical Gases. Reviewed

    R, Kitaura.; K, Seki.; G, Akiyama.; S, Kitagawa.

    Angew. Chem. Int. Ed.   Vol. 1   page: 133-135   2003

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  217. Porous coordination-polymer crystals with gated channels specific for supercritical gases Reviewed

    R Kitaura, K Seki, G Akiyama, S Kitagawa

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 42 ( 4 ) page: 428 - 431   2003

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    DOI: 10.1002/anie.200390130

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  218. Oxygen molecule ladder II : Direct observation of adsorbed gas molecules by the MEM charge density study

    Kubota Yoshiki, Takata Masaki, Kitaura Ryo, Matsuda Ryotaro, Kitagawa Susumu, Chang Ho Chol, Kobayashi Tatsuo C., Sakata Makoto

    Meeting Abstracts of the Physical Society of Japan   Vol. 58 ( 0 ) page: 782 - 782   2003

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    DOI: 10.11316/jpsgaiyo.58.1.4.0_782_3

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  219. Molecular oxygen ladder I : Synthesis of porous metal complex assemblies toward the bottom-up construction and their oxygen adsorption properties

    Kitagawa S., Matsuda R., Kitaura R., Chang H-C., Kobayashi T. C., Takata M.

    Meeting Abstracts of the Physical Society of Japan   Vol. 58 ( 0 ) page: 782 - 782   2003

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    DOI: 10.11316/jpsgaiyo.58.1.4.0_782_2

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  220. *Formation of a One-Dimensional Array of Oxygen in a Microporous Metal-Organic Solid. Reviewed

    R, Kitaura.; S, Kitagawa.; Y, Kubota.; T, Kobayashi.; K, Kindo.; Y, Mita.; A, Matsuo.; M, Kobayashi.; H, Chang.; T, Ozawa.; M, Suzuki.; M, Sakata.; M, Takata.

    Science   Vol. 298   page: 2538-2361   2002.12

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  221. CD36 genotype and long-chain fatty acid uptake in the heart.

    Kintaka T, Tanaka T, Imai M, Adachi I, Narabayashi I, Kitaura Y

    Circulation journal : official journal of the Japanese Circulation Society   Vol. 66 ( 9 ) page: 819 - 25   2002.9

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    DOI: 10.1253/circj.66.819

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  222. Statistical analysis of fiber area in human skeletal muscle.

    McGuigan MR, Kraemer WJ, Deschenes MR, Gordon SE, Kitaura T, Scheett TP, Sharman MJ, Staron RS

    Canadian journal of applied physiology = Revue canadienne de physiologie appliquee   Vol. 27 ( 4 ) page: 415 - 22   2002.8

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    DOI: 10.1139/h02-022

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  223. Novel flexible frameworks of porous cobalt(III) coordination polymers that show selective guest adsorption based on the switching of hydrogen-bond pairs of amide groups Reviewed

    K Uemura, S Kitagawa, M Kondo, K Fukui, R Kitaura, HC Chang, T Mizutani

    CHEMISTRY-A EUROPEAN JOURNAL   Vol. 8 ( 16 ) page: 3586 - 3600   2002.8

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    Four porous crystalline coordination polymers with two-dimensional frameworks of a double-edged axe-shaped motif, {[Co(NCS)(2)(3-pia)(2)] . 2EtOH . 11 H(2)O}(n) (1a), {[Co(NCS)(2)- (3-pia)(2)] . 4Me(2)CO}(n) (3a), {[Co(NCS)(2)- (3-pia)(2)] . 4THF}(n) (3b) and {[Co(NCS)(2)- (3-pna)(2)](n)} (5), have been synthesized by the reaction of cobalt(ii) thiocyanate with N-(3-pyridyl)isonicotinamide (3-pia) or N-(3-pyridyl)nicotinamide (3-pna). X-ray crystallographic characterization reveals that adjacent layers are stacked such that channels are created, except in 5. The channels form a hydrogen-bonded interior for guest molecules; in practice, I a contains ethanol and water molecules as guests in the channels with hydrogen bonds, whereas 3b (3a) contains tetrahydrofuran (acetone) molecules. In la, the "double-edged axe-shaped" motifs in adjacent sheets are not located over the top of each other, while the motifs in 3b stack so perfectly as to overlap each other in an edge-to-edge fashion. This subtle change in the three-dimensional framework is associated with the template effect of the guests. Compound 5 has no guest molecules and, therefore, the amide groups in one sheet are used for hydrogen-bonding links with adjacent sheets. Removal of the guest molecules from la and 3b (3a) causes a structural conversion accompanied by a color change. Pink 1 a cannot retain its original framework and changes into a blue amorphous compound. On the other hand, the framework of pink 3b (3a) is transformed to a new crystalline framework of violet 4. Interestingly, 4 reverts to the original pink crystals of 3b (3a) when it is exposed to THF (or acetone) vapor. Spectroscopic measurements (visible, EPR, and IR) provide a clue to the crystal-to-crystal transformation; on removal of the guests, the amide groups are used to form the P sheet-type hydrogen bonding between the sheets, and thus the framework withstands significant stress on removal of guest molecules. This mechanism is attributed to the arrangement of the adjacent sheets so suited in regularity that the P sheet-type structure forms efficiently. The apohost 4 does not adsorb cyclopentane, showing a guest selectivity that, in addition to size, hydrogen-bonding capability is required for the guest molecules. The obtained compound is categorized as a member of a new generation of compounds tending towards functional porous coordination polymers.

    DOI: 10.1002/1521-3765(20020816)8:16<3586::AID-CHEM3586>3.0.CO;2-K

    Web of Science

    PubMed

  224. Pillared layer compounds based on metal complexes. Synthesis and properties towards porous materials

    S Kitagawa, R Kitaura

    COMMENTS ON INORGANIC CHEMISTRY   Vol. 23 ( 2 )   2002.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    DOI: 10.1080/02603590214512

  225. Framework engineering by anions and porous functionalities of Cu(II)/4,4 '-bpy coordination polymers

    S Noro, R Kitaura, M Kondo, S Kitagawa, T Ishii, H Matsuzaka, M Yamashita

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   Vol. 124 ( 11 ) page: 2568 - 83   2002.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    DOI: 10.1021/ja0113192

    PubMed

  226. Novel Flexible Frameworks of Porous Cobalt(II) Coordination Polymers that Show Selective Guest Adsorption Based on the Switching of Hydrogen-Bond Pairs of Amide Groups. Reviewed

    K, Uemura.; S, Kitagawa.; M, Kondo.; K, Fukui.; R, Kitaura.; H, Chang.; T, Mizutani.

    Chemistry. Eur. J.   Vol. 8   page: 3586-3600   2002

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    Language:English   Publishing type:Research paper (scientific journal)  

  227. Novel Pillared-Layer Coordination Polymer Network with Hysteretic Sorption: [Cu2(pzdc)2(dpyg)]n(pzdc=pyrazine-2,3-dicarboxylate;dpyg=1,2-di(4-pyridyl)glycol) Reviewed

    R, Kitaura.; K, Fujimoto.; S, Noro.; S, Kitagawa.

    Angew. Chem. Int. Ed.   Vol. 41   page: 133-135   2002

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  228. Framework Engineering by Anions and Porous Functions of Cu(II)/4,4'-bpy Coordination Polymers. Reviewed

    S, Noro.; R, Kitaura.; M, Kondo.; S, Kitagawa.; T, Ishii.; H, Matsuzaka.; M, Yamashita.

    J. Am. Chem. Soc.   Vol. 124 ( 11 ) page: 2568-2583   2002

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  229. A pillared-layer coordination polymer network displaying hysteretic sorption: [Cu-2(pzdc)(2)(dpyg)](n) (pzdc = pyrazine-2,3-dicarboxylate; dpyg=1,2-di(4-pyridyl)glycol) Reviewed

    R Kitaura, K Fujimoto, S Noro, M Kondo, S Kitagawa

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 41 ( 1 ) page: 133 - 135   2002

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/1521-3773(20020104)41:1<133::AID-ANIE133>3.0.CO;2-R

    Web of Science

    PubMed

  230. Quantification of left atrial appendage spontaneous echo contrast in patients with chronic nonalvular atrial fibrillation.

    Ito T, Suwa M, Nakamura T, Miyazaki S, Kobashi A, Kitaura Y

    Journal of cardiology   Vol. 37 ( 6 ) page: 325 - 33   2001.6

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    PubMed

  231. Low temperature conversion of NO to N2 by use of a novel Ni loaded porous carbon. Reviewed

    K, Miura.; H, Nakagawa.; R, Kitaura.; T, Sato.

    Chemical Engineering Science   Vol. 56   page: 1623-1629   2001

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  232. Integrated backscatter assessment of left atrial spontaneous echo contrast in chronic nonvalvular atrial fibrillation: relation with clinical and echocardiographic parameters.

    Ito T, Suwa M, Kobashi A, Yagi H, Nakamura T, Miyazaki S, Kitaura Y

    Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography   Vol. 13 ( 7 ) page: 666 - 73   2000.7

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1067/mje.2000.104739

    PubMed

  233. Pillared Layer Compounds Based on Metal Complexes. Synthesis and Properties Towards Porous Materials. Reviewed

    S. Kitagawa, R. Kitaura

    Comments on Inorganic Chemistry   Vol. 23   page: 101-123   2000

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▼display all

Books 4

  1. ナノマテリアル技術大系 第2巻 ナノ金属編

    北浦 良、北川 進( Role: Joint author)

    株式会社フジ・テクノシステム  2006.1 

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    Language:Japanese

  2. カーボンナノチューブ・ピーポット物質の創製と物性評価

    篠原 久典, 菅井 俊樹, 北浦 良( Role: Sole author)

    [出版者不明]  2006 

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  3. 新時代の多孔性材料とその応用-ナノサイエンスが作る新材料-

    北浦良、北川進( Role: Joint author)

    シーエムシー出版  2004.12 

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    Language:Japanese

  4. 集積型金属錯体の科学 -物質機能の多様性を求めて-

    北川 進、北浦 良( Role: Joint author)

    化学同人  2003.3 

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    Language:Japanese

MISC 27

  1. A Versatile Post-Doping Towards Two-Dimensional Semiconductors

    Y. Murai, S. Zhang, T. Hotta, Z. Liu, Y. Miyata, T. Irisawa, Y. Gao, M. Maruyama, S. Okada, H. Mogi, T. Sato, S. Yoshida, H. Shigekawa, Takashi Taniguchi, Kenji Watanabe, R. Kitaura

        2021.5

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    We have developed a simple and straightforward way to realize controlled
    post-doping towards 2D transition metal dichalcogenides (TMDs). The key idea is
    to use low-kinetic energy dopant beams and a high-flux chalcogen beam at the
    same time, leading to substitutional doping with controlled dopant densities.
    Atomic-resolution transmission electron microscopy has revealed that dopant
    atoms injected toward TMDs are incorporated substitutionally into the hexagonal
    framework of TMDs. Electronic properties of doped TMDs (Nb-doped WSe2) have
    shown drastic change, p-type action with more than two orders of magnitude
    increase in on current. Position-selective doping has also been demonstrated by
    the post-doping toward TMDs with a patterned mask on the surface. The
    post-doping method developed in this work can be a versatile tool for 2D-based
    next-generation electronics in the future.

    arXiv

    Other Link: http://arxiv.org/pdf/2105.03182v2

  2. Indirect bandgap of hBN-encapsulated monolayer MoS2

    Yosuke Uchiyama, Kenji Watanabe, Takashi Taniguchi, Kana Kojima, Takahiko Endo, Yasumitsu Miyata, Hisanori Shinohara, Ryo Kitaura

        2019.3

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    Publishing type:Internal/External technical report, pre-print, etc.  

    We present measurements of temperature dependence of photoluminescence
    intensity from monolayer MoS2 encapsulated by hexagonal boron nitride (hBN)
    flakes. The obtained temperature dependence shows an opposite trend to that of
    previously observed in a monolayer MoS2 on a SiO2 substrate. Ab-initio
    bandstructure calculations have revealed that monolayer MoS2 encapsulated by
    hBN flakes have no longer a direct-gap semiconductor but an indirect-gap
    semiconductor. This is caused by orbital hybridization between MoS2 and hBN,
    which leads to upward shift of gamma-valley of MoS2. This work shows an
    important implication that the hBN-encapsulated structures used to address
    intrinsic properties of two-dimensional crystals can alter basic properties
    encapsulated materials.

    DOI: 10.1038/s41699-019-0108-4

    arXiv

    Other Link: http://arxiv.org/pdf/1903.06427v2

  3. Efficient Preparation of Graphene Liquid Cells

      Vol. 53 ( 5 ) page: 351 - 355   2018.5

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    Language:Japanese  

    CiNii Article

    CiNii Books

  4. MBE growth of two-dimensional materials

    Ryo Kitaura

    Abstract of annual meeting of the Surface Science of Japan   Vol. 2018 ( 0 ) page: 27 - 27   2018

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    Language:Japanese   Publisher:The Japan Society of Vacuum and Surface Science  

    DOI: 10.14886/sssj2008.2018.0_27

    CiNii Article

  5. hBN/単原子層WS<sub>2</sub>/hBN構造の励起子ダイナミクス

    星裕介, 黒田隆, 岡田光博, 守谷頼, 増渕覚, 渡邊賢司, 谷口尚, 北浦良, 町田友樹, 町田友樹

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   Vol. 64th   page: ROMBUNNO.16p‐F203‐13   2017.3

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    Language:Japanese  

    J-GLOBAL

  6. 20-kV Diffractive Imaging of Graphene by using an SEM-based Dedicated Microscope

    Osamu Kamimura, Takashi Dobashi, Yosuke Maehara, Ryo Kitaura, Hisanori Shinohara, Kazutoshi Gohara

    Microscopy and Microanalysis   Vol. 21 ( 3 ) page: 35 - 36   2015

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    Language:English   Publishing type:Book review, literature introduction, etc.   Publisher:Cambridge University Press  

    DOI: 10.1017/S1431927615000975

    Scopus

  7. 9pAH-11 Antiferroelectric Phase Transition of [Li@C_<60>](PF_6)

    Aoyagi Shinobu, Sugimoto Kunihisa, Okada Hiroshi, Hoshino Norihisa, Akutagawa Tomoyuki

    Meeting Abstracts of the Physical Society of Japan   Vol. 69 ( 0 ) page: 621 - 621   2014

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.69.2.4.0_621_4

    CiNii Article

  8. Size-Dependent Luminescence Properties of Chromatographically-Separated Graphene Quantum Dots

    Naoto Fuyuno, Daichi Kozawa, Yuhei Miyauchi, Shinichiro Mouri, Ryo Kitaura, Hisanori Shinohara, Toku Yasuda, Naoki Komatsu, Kazunari Matsuda

        2013.11

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    Publishing type:Internal/External technical report, pre-print, etc.  

    We studied the photoluminescence (PL) properties of graphene quantum dots
    (GQDs) separated by size-exclusion high performance liquid chromatography. The
    size separation of GQDs was confirmed by transmission electron microcopy
    images. PL excitation maps of chromatographically-separated GQDs show four
    distinct emission peaks at 330, 440, 520, and 600 nm, respectively. The
    dominant luminescence features of the separated GQDs show discrete change
    depending on the overall size of GQDs, indicating that PL variation occurs
    because of differences in density, shape, and size of sp2 fragments available
    in the GQDs. On the basis of the experimental results of PL peak wavelength and
    pH dependence, the emission is attributed to quasi-molecular PL from the
    fragments composed of a few aromatic rings with oxygen containing functional
    groups.

    arXiv

    Other Link: http://arxiv.org/pdf/1311.1684v1

  9. 新規カーボンナノチューブハイブリッド物質の創製と評価

    北浦 良, 篠原 久典

    ニュ-ダイヤモンド   Vol. 26 ( 4 ) page: 8 - 11   2010.10

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    Language:Japanese   Publisher:オ-ム社  

    CiNii Article

    CiNii Books

  10. リチウム内包C<sub>60</sub>フラーレンの構造と相転移

    青柳忍, 西堀英治, 北浦良, 岡田洋史, 酒井健, 小野吉弘, 笠間泰彦, 飛田博実, 篠原久典, 澤博

    日本物理学会講演概要集   Vol. 65 ( 2 ) page: 813   2010.8

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    J-GLOBAL

  11. Diameter-Controlled Synthesis of Single-Wall Carbon Nanotubes by using Metal-Catalyst Embedded into Inner Pores of Zeolites Invited

    Keita Kobayashi, Ryo Kitaura, Hisanori Shinohara

    New Diamond   Vol. 25 ( 3 ) page: 44 - 45   2009.7

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

  12. ナノテンプレート反応による金属原子ナノワイヤー内包カーボンナノチューブの創製

    今津 直樹, 北浦 良, 篠原 久典

    未来材料   Vol. 8 ( 11 ) page: 36 - 43   2008.11

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    Language:Japanese   Publisher:エヌ・ティー・エス  

    CiNii Article

    CiNii Books

  13. 直鎖ポリインを内包したカーボンナノチューブの合成と評価

    西出大亮, 若林知成, 土肥博史, 北浦良, 菅井俊樹, 篠原久典

    ナノ学会大会講演予稿集   Vol. 4th   page: 271   2006.5

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    J-GLOBAL

  14. 多孔性配位高分子結晶中におけるアセチレンの特異的吸着挙動

    松田亮太郎, 北浦良, 北川進, 久保田佳基, 小林達夫, 高田昌樹, 美田佳三

    錯体化学討論会講演要旨集   Vol. 55th   page: 69   2005.9

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    J-GLOBAL

  15. 吸着量に依存する多孔性配位高分子結晶の構造転移と吸着挙動

    松田亮太郎, 北浦良, 北川進, 久保田佳基, 小林達夫, 高田昌樹

    コロイドおよび界面化学討論会講演要旨集   Vol. 58th   page: 200   2005.8

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    J-GLOBAL

  16. 多孔性錯体のゲスト形状応答型構造転移

    松田 亮太郎, 北浦 良, 北川 進, 小林 達夫, 久保田 佳基, 高田 昌樹

    第54回錯体化学討論会     2004.9

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  17. 多孔性金属錯体のアセチレン吸着挙動及びその構造の直接観察

    松田亮太郎, 北川進, 北浦良, 久保田佳基, 小林達夫, 高田昌樹

    コロイドおよび界面化学討論会講演要旨集   Vol. 57th   page: 195   2004.8

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    J-GLOBAL

  18. 配位高分子を用いたナノ空間の機能化学 (特集 化学のフロンティア2004--はばたけ若き研究者たち)

    北浦 良

    化学と工業   Vol. 57 ( 2 ) page: 99 - 102   2004.2

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    Language:Japanese   Publisher:日本化学会  

    CiNii Article

    CiNii Books

  19. 27aPS-97 Magnetism of adsorbed O_2 in porous Cu complex assemblies

    Suzuki M, Hosokawa K, Matsuda R, Kitaura R, Matsuo A., Kindo K., Kitagawa S, Kobayashi T. C

    Meeting Abstracts of the Physical Society of Japan   Vol. 59 ( 0 ) page: 458 - 458   2004

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.59.1.3.0_458_2

    CiNii Article

  20. 多孔性配位高分子のベンゼン吸着による細孔収縮型構造相転移

    松田亮太郎, 堀毛悟史, 北浦良, 北川進, 高田昌樹

    分子構造総合討論会講演要旨集(CD-ROM)   Vol. 2003   page: 4PP120   2003.9

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    J-GLOBAL

  21. 非対称配位子を持つ多孔性配位高分子結晶の構造と吸着及び誘電特性

    松田亮太郎, 北浦良, 北川進, 小林達夫, 久保田佳基, 高田昌樹

    錯体化学討論会講演要旨集   Vol. 53rd   page: 388   2003.9

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    J-GLOBAL

  22. 酸素分子が一列に並んだ!--多孔性配位高分子を用いた新しいナノサイエンス

    北浦 良, 北川 進

    化学   Vol. 58 ( 7 ) page: 34 - 38   2003.7

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    Language:Japanese   Publisher:化学同人  

    CiNii Article

    CiNii Books

  23. 電気双極子を有する配位子を用いた新規多配位高分子の合成と構造

    松田亮太郎, 北浦良, 張浩徹, 北川進

    日本化学会第82春季年会     2003.3

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  24. Magnetism of adsorbed O_2 in Cu complex with microporous

    Suzuki M., Kobayashi T. C., Matsuo A., Kindo K., Mita Y., Kobayashi M., Matsuda R., Kitaura R., Kitagawa S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 58 ( 0 ) page: 370 - 370   2003

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.58.2.3.0_370_3

    CiNii Article

  25. Magnetic property of adsorbed O_2 in Cu complex

    Matsuo A., Suzuki M., Kitaura R., Chang H., Kitagawa S., Kobayashi T. C., Kindo K.

    Meeting Abstracts of the Physical Society of Japan   Vol. 58 ( 0 ) page: 442 - 442   2003

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.58.1.3.0_442_3

    CiNii Article

  26. Molecular oxygen ladder IV : Raman scattering of adsorbed oxygen

    Kobayashi T. C., Suzuki M., Mita Y., Kobayashi M., Kitaura R., Matsuda R., Chang H. C., Kitagawa S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 58 ( 0 ) page: 783 - 783   2003

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.58.1.4.0_783_1

    CiNii Article

  27. Oxygen molecule ladder III : magnetism

    Kindo K., Matsuo A., Kobayashi T. C., Suzuki M., Matsuda R., Kitaura R., Chang H. C., Kitagawa S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 58 ( 0 ) page: 782 - 782   2003

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.58.1.4.0_782_4

    CiNii Article

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Presentations 71

  1. Optical properties of strained WS2/WSe2 van der Waals heterostructures

    Ryotaro Fukui, R. Usami, S. Suzuki, T. Takahashi, T. Endo, Y. Miyata, R. Kitaura, J. Pu

    2021.9.20 

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    Event date: 2021.9

    Language:English   Presentation type:Poster presentation  

  2. グラフェン超薄膜を用いた高機能汎用型光学素子の開発 (2)

    柏倉一斗, 丹羽由実, 小川ともよ, 田原譲, 北浦良, 三石郁之, Pablo Sol, ıs-Fern ́andez, 河 原憲治, 吾郷浩樹, 野本憲太郎, 谷口卓郎, 小高大樹, シオ電機株式会社, R, D 本

    日本天文学会2021年秋季年会  2021.9.13 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  3. Transport behaviors of excitonic carriers in monolayer transition metal dichalcogenides

    Mengsong Xue, Takato Hotta, Ruben Canton-Vitoria, Ryo Kitaura

    NT21  2021.6.8 

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    Event date: 2021.6

    Language:English   Presentation type:Poster presentation  

  4. Tailor-made two dimensional nano-scale super-structures

    Nanami Ichinose, Satoshi Iida, Zheng Liu, Ryo Kitaura

    NT21  2021.6.8 

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    Event date: 2021.6

    Language:English   Presentation type:Poster presentation  

  5. ポストドーピングによる遷移金属カルコゲナイド原子層のp/n型制御

    村井 雄也, 劉崢, 入沢 寿史, 遠藤 尚彦, 宮田 耕充, 吉田 昭二, 岡田 晋, 北浦 良

    第68回応用物理学会春季学術講演会  2021.3.19 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Poster presentation  

  6. Tailor-made two-dimensional nano-scale super-structures

    Nanami Ichinose, Satoshi Iida,Liu Zheng, Ryo Kitaura

    第59回フラーレン・ナノチューブ・グラフェン総合シンポジウム  2020.9.17 

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    Event date: 2020.9

    Language:English   Presentation type:Poster presentation  

  7. A controllable post doping method for TMD atomic layers

    YuyaMurai, ShojiYoshida,ZhengLiu, ToshifumiIrisawa, HiroshiShimizu, TakahikoEndo, YasumitsuMiyata,RyoKitaura

    2020.9.17 

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    Event date: 2020.9

    Language:English   Presentation type:Poster presentation  

  8. 原子打ち込みによる TMD ドーピング法の開発とそのデバイス応用

    村井雄也, 劉 崢, 入沢 寿史, 宮田 耕充, 北浦 良

    第81回応用物理学会秋季学術講演会  2020.9.10 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Poster presentation  

  9. ナノスケール二次元超構造のテーラーメイド創出

    一瀬七海, 飯田智士, 劉 崢, 北浦良

    第81回応用物理学会秋季学術講演会  2020.9.10 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Poster presentation  

  10. カーボンナノチューブを組み込んだナノ構造体の作製

    中嶋春菜, 堀田貴都, 井ノ上泰輝, 千足昇平, 上野啓司, 渡邊賢司, 谷口尚, 丸山茂夫, 北浦良

    第81回応用物理学会秋季学術講演会  2020.9.10 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Poster presentation  

  11. Flattening of 2D materials encapsulated by hBN flakes

    Takato Hotta, Akihiro Ueda, Shohei Higuchi, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Ryo Kitaura

    2020.3.15 

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    Event date: 2020.3

    Language:English   Presentation type:Poster presentation  

  12. In-Plane heterostructure of MoS2 polytypes

    Ruben CANTON VITORIA, Ryo KITAURA

    2020.3.15 

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    Event date: 2020.3

    Language:English   Presentation type:Poster presentation  

  13. コールドウォール型有機金属化学気相成長法を用いた二次元超格子の作製

    飯田 智士, 堀田 貴都, 一瀬 七海, 渡辺 賢司, 谷 口 尚, 劉崢, 北浦 良

    第67回応用物理学会春季学術講演会  2020.3.15 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  14. 原子層積層構造の平坦化法の検討

    上田 哲大, 堀田 貴都, 上野 啓司, 渡邊 賢司, 谷口 尚, 北浦 良

    第67回応用物理学会春季学術講演会  2020.3.12 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Poster presentation  

  15. 分子線エピタキシー法を用いた 遷移金属ダイカルコゲナイドのヘテロ構造の作製

    村井 雄也, 重川 秀実, 吉田 昭二, 落合 太一, 北浦 良

    第67回応用物理学会春季学術講演会  2020.3.12 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Poster presentation  

  16. CNTローカルゲートを用いたhBN/MoSe2/hBNデバイスの作製とその評価

    堀田 貴都, 中嶋 春奈, 井ノ上 泰輝, 千足 昇平, 上野 啓司, 渡邊 賢司, 谷口 尚, 丸山 茂夫, 北浦 良

    第67回応用物理学会春季学術講演会  2020.3.12 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Poster presentation  

  17. 分子線エピタキシー法を用いた遷移金属ダイカルコゲナイドのヘテロ構造の作製

    村井雄也, 一瀬七海, 北浦良, 保田諭

    錯体化学会第69回討論会  2019.9.21 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

  18. Fabrication and evaluation of hBN-encapsulated Monolayer MoSe2 with CNT local gates

    Takato Hotta, Haruna Nakajima, Taiki Inoue, Shohei Chiashi, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Shigeo Maruyama, Ryo Kitaura

    2019.9.5 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  19. Molecular beam epitaxy growth of transition-metal-dichalcogenide based two-dimensional heterostructures

    Yuya Murai, Nanami Ichinose, Satoshi Yasuda, Ryo Kitaura

    2019.9.4 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  20. Growth of Transition-metal-dichalcogenide-based two-dimensional superstructures with Cold-walled Metal-Organic CVD

    Satoshi Iida, Takato Hotta, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    2019.9.3 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  21. Exciton Diffusion in hBN-encapsulated Monolayer MoSe2

    Takato Hotta, Syohei Higuchi, Yosuke Uchiyama, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    Compound Semiconductor Week 2019 (CSW2019)  2019.5.20 

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    Event date: 2019.5

    Language:English   Presentation type:Oral presentation (general)  

  22. Bilayer WS 2のCVD成長の高効率合成とその光学特性

    稲波 伸之介, 堀田 貴都, 篠原 久典, 北浦 良

    第66回 応用物理学会春季学術講演会  2019.3.10 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Poster presentation  

  23. hBNサンドした TMD原子層における 励起子拡散

    堀田 貴都, 樋口 翔平, 内山 揚介, 上野 啓司, 渡邊 賢 司, 谷口 尚, 篠原 久典, 北浦 良

    第66回 応用物理学会春季学術講演会  2019.3.10 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Poster presentation  

  24. Development of molecular beam epitaxy for preparation of transition metal dichalcogenide atomic layers and their heterostructures

    Koki Terashima, Yuya Murai, Takato Hotta, Kenji Watanabe, Takashi Taniguchi

    2019.3.3 

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    Event date: 2019.3

    Language:English   Presentation type:Poster presentation  

  25. Exciton Diffusion in hBN-encapsulated Monolayer TMDs

    Takato Hotta, Shohei Higuchi, Yosuke Uchiyama, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    2019.3.2 

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    Event date: 2019.3

    Language:English   Presentation type:Poster presentation  

  26. Growth of TMDs with Cold-walled Metal-Organic Chemical Vaper Deposition

    Satoshi Iida, Takato Hotta, Hisanori Shinohara, Ryo Kitaura

    2019.3.2 

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    Event date: 2019.3

    Language:English   Presentation type:Poster presentation  

  27. Properties of van der Waals heterostructures of Transition metal dichalcogenide and hexagonal boron nitrides

    Ryo Kitaura

    The 9th A3 Symposium on Emerging Materials  2018.10.31 

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    Event date: 2018.10

    Language:English   Presentation type:Oral presentation (general)  

  28. Controlled growth of transition metal dichalcogenide thin films with molecular beam epitaxy

    Koki Terashima, Yuya Murai, Takato Hotta, Hisanori Shinohara, Ryo Kitaura

    The 9th A3 Symposium on Emerging Materials  2018.10.29 

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    Event date: 2018.10

    Language:English   Presentation type:Poster presentation  

  29. Exciton Diffusion in hBN-encapsulated Monolayer TMDs

    Takato Hotta, Shohei Higuchi, Yosuke Uchiyama, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    The 9th A3 Symposium on Emerging Materials  2018.10.29 

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    Event date: 2018.10

    Language:English   Presentation type:Poster presentation  

  30. Exciton Diffusion in a hBN-encapsulated Monolayer Transition Metal Dichalcogenide

    Takato Hotta, Shohei Higuchi, Yosuke Uchiyama, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    2018.9.20 

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (general)  

  31. 二硫化モリブデン(MoS2)原子層における基板効果と光学応答

    内山 揚介, 小島 佳奈, 渡邊 賢司, 谷口 尚, 宮田 耕充, 篠原 久典, 北浦 良

    第79回応用物理学会秋季学術講演会  2018.9.19 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  32. CVD成長したWS2 原子層を用いた高移動度デバイス作製法の開発

    上田 哲大, 堀田 貴都, 内山 揚介, 宮田 耕充, 渡邊 賢司, 谷口 尚, 篠原 久典, 北浦 良

    第79回応用物理学会秋季学術講演会  2018.9.18 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Poster presentation  

  33. コールドウォール有機金属化学気相成長法によるTMD原子層の結晶成長

    飯田 智士, 堀田 貴都, 篠原 久典, 北浦 良

    第79回応用物理学会秋季学術講演会  2018.9.18 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  34. ガスソースおよびハライドアシスト分子線エピタキシー法による遷移金属ダイカルコゲナイドの結晶成長

    寺島 幸輝, 村井 雄也, 堀田 貴都, 篠原 久典, 北浦 良

    第79回応用物理学会秋季学術講演会  2018.9.18 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Poster presentation  

  35. Development of fabrication method for high quality hBN-encapsulated TMD device

    Takato Hotta, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    2018.9.11 

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    Event date: 2018.9

    Language:English   Presentation type:Poster presentation  

  36. All-dry fabrication of hBN-encapsulated devices with high-quality CVD-grown transition metal dichalcogenide flakes

    Ryo Kitaura

    2018.8.1 

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    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

  37. Transition metal dichalcogenide based van der Waals heterostructures: fabrication and properties

    Ryo Kitaura

    NT18  2018.7.15 

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    Event date: 2018.7

    Language:English   Presentation type:Oral presentation (general)  

  38. WS2/MoS2ヘテロ積層構造における発光特性の並進の自由度依存

    岡田光博, Alex Kutana, 暮石宥介, Sunny Gupta, 渡邊賢司, 谷口尚, Boris I. Yakobson, 篠原久典, 北浦良

    第65回応用物理学会春季学術講演会  2018.3.19 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Poster presentation  

  39. 六方晶窒化ホウ素基板を用いた遷移金属ダイカルコゲナイド原子層の分子線エピタキシー成長とその評価

    堀田 貴都, 徳田 拓人, 渡邊 賢司, 谷口 尚, 篠原 久典, 北浦良

    第65回応用物理学会春季学術講演会  2018.3.18 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Poster presentation  

  40. All-dry fabrication of hBN-encapsulated devices with high-quality CVD-grown transition metal dichalcogenide flakes

    Takato Hotta, Akihiro Ueda, Yosuke Uchiyama, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    APS March Meeting 2018  2018.3.5 

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    Event date: 2018.3

    Language:English   Presentation type:Oral presentation (general)  

  41. 六方晶窒化ホウ素/遷移金属ダイカルコゲナイドヘテロ積層デバイスの作製と特性評価

    内山揚介, 堀田貴都, 渡邊賢司, 谷口尚, 上野啓司, 篠原久典, 北浦良

    2017年度 帝人21世紀フォーラム  2018.2.3 

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    Event date: 2018.2

    Language:Japanese   Presentation type:Oral presentation (general)  

  42. Identification of Interlayer Excitons in WS2/MoS2 van der Waals Heterostructures

    Mitsuhiro Okada, Yusuke Kureishi, Alex Kutana, Kenji Watanabe, Takashi Taniguchi, Boris Yako Shinohara, Ryo Kitaura

    The 8th A3 Symposium on Emerging Materials:Nano materials for Energy and Electoronics  2017.10.25 

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    Event date: 2017.10

    Language:English   Presentation type:Poster presentation  

  43. Optical properties of a van der Waals heterostructure of MoSe2

    Shohei Higuchi, Takato Hotta, Mitsuhiro Okada, Yosuke Uchiyama, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    2017.9.13 

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    Event date: 2017.9

    Language:English   Presentation type:Poster presentation  

  44. Metalorganic molecular beam epitaxy growth of a two-dimensional topological insulator: monolayer 1T'-WTe2

    Koki Terashima, Takato Hotta, Takuto Tokuda, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    2017.9.13 

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    Event date: 2017.9

    Language:English   Presentation type:Poster presentation  

  45. Identification of PL emissions from Interlayer Excitons in 2D van der Waals Heterostructures

    Mitsuhiro Okada, Yusuke Kureishi, Alex Kutana, Kenji Watanabe, Takashi Taniguchi, Hisanori, Shinohara, Ryo Kitaura

    2017.9.7 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

  46. 原子層ヘテロ積層構造の作成手法による光学特性の変化

    岡田 光博, 暮石 宥介, 徳田 拓人, 渡邊 賢司, 谷口 尚, 篠原 久典, 北浦 良

    第78回応用物理学会 秋季学術講演会  2017.9.6 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Poster presentation  

  47. 六方晶窒化ホウ素基板を用いた遷移金属ダイカルコゲナイド原子層の分子線エピタキシー成長とその評価

    堀田 貴都, 徳田 拓人, 渡邊 賢司, 谷口 尚, 篠原 久典, 北浦良

    第78回応用物理学会秋季学術講演会  2017.9.6 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  48. 原子層ヘテロ積層構造の作成手法による光学特性の変化

    岡田 光博, 暮石 宥介, 徳田 拓人, 渡邊 賢司, 谷口 尚, 篠原 久典, 北浦 良

    第78回応用物理学会秋季学術講演会  2017.9.5 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Poster presentation  

  49. Identification of PL emissions from Interlayer Excitons in 2D van der Waals Heterostructures

    Mitsuhiro Okada, Yusuke Kureishi, Alex Kutana, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    2017.9.5 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

  50. Transition metal dichalcogenides based van der Waals heterostacks: fabrication and properties

    Ryo Kitaura

    18th International Conference on the Science and Application of Nanotubes and Low-dimensional Materials (NT17)  2017.6.26 

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    Event date: 2017.6

    Language:English   Presentation type:Oral presentation (general)  

  51. カーボンナノチューブの酸化分解反応と新奇内包物質の抽出

    山岸美保, 大町遼, 加藤雅親, 北浦良, 篠原久典

    日本化学会 第97春季年会 (2017)  2017.3.17 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  52. 二硫化モリブデン原子層の双晶境界の評価

    暮石 宥介, 岡田 光博, 吉田 昭二, 渡邊 賢司, 谷口 尚, 重川 秀実, 篠原 久典, 北浦 良

    第64回応用物理学会春季学術講演会  2017.3.16 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  53. Template Synthesis of π-Conjugated Nanomaterials using Inner Space of Carbon Nanotubes

    Yasuhiro Kinno, Haruka Omachi, Ryo Kitaura, Hisanori Shinohara

    2017.3.3 

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    Event date: 2017.3

    Language:English   Presentation type:Poster presentation  

  54. Relaxation Mechanism of Interlayer Excitons in 2D van der Waals Heterostuctures

    Mitsuhiro Okada, Yusuke Kureishi, Yusuke Hasegawa, Alex Kutana, Kenji Watanabe, Takashi Taniguchi, Yuhei Miyauchi, Kazunari Matsuda, Hisanori Shinohara, Ryo Kitaura

    2017.3.2 

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    Event date: 2017.3

    Language:English   Presentation type:Poster presentation  

  55. Controlled fabrication of graphene liquid cells

    Yoshimasa Michiya, Tomohiro Yasunishi, Yutaka Ohno, Hisanori Shinohara, Ryo Kitaura

    2017.3.2 

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    Event date: 2017.3

    Language:English   Presentation type:Poster presentation  

  56. An experimental and theoretical study on the scanning tunneling spectroscopy of europium nanowires encapsulated in carbon nanotubes

    Terunobu Nakanishi, Ryo Kitaura, Takazumi Kawai, Susumu Okada, Shoji Yoshida, Osamu Takeuchi, Hidemi Shigekawa, Hisanori Shinohara

    2017.3.2 

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    Event date: 2017.3

    Language:English   Presentation type:Poster presentation  

  57. 新奇ガドリニウム内包フラーレン誘導体の合成と単離

    中川綾乃, 青柳忍, 加藤立久, 山口貴久, 大町遼, 北浦良, 篠原久典

    2017年帝人21世紀フォーラム  2017.2.4 

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    Event date: 2017.2

    Language:Japanese   Presentation type:Oral presentation (general)  

  58. Template Synthesis of π-Conjugated 1-D Nanomaterials Using Inner Space of Carbon Nanotubes

    Yasuhiro Kinno, Haruka Omachi, Ryo Kitaura, Hisanori Shinohara

    2017.1.26 

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    Event date: 2017.1

    Language:English   Presentation type:Poster presentation  

  59. Single-Step Extraction of Semiconducting Single-Wall Carbon Nanotubes by Aqueous-Two Phase (ATP) System

    Tomohiko Komuro, Haruka Omachi, Jun Hirotani, Ryo Kitaura, Yutaka Ohno, Hisanori Shinohara

    2017.1.26 

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    Event date: 2017.1

    Language:English   Presentation type:Poster presentation  

  60. Growth and Evaluation of Transition Metal Dichalcogenide Atomic Layer by Molecular Beam Epitaxy

    Takuto Tokuda, Takato Hotta, Zhao Sihan, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    2017.1.26 

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    Event date: 2017.1

    Language:English   Presentation type:Poster presentation  

  61. Oxidative Decomposition of Carbon Nanotubes and Extraction of Encapsulated Materials

    Haruka Omachi, Miho Yamagishi, Masachika Kato, Ryo Kitaura, Hisanori Shinohara

    MNC2016 (29th International Microprocesses and Nanotechnology Conference)  2016.11.9 

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    Event date: 2016.11

    Language:English   Presentation type:Oral presentation (general)  

  62. hBN-encapsulated Transition Metal Dichalcogenide van der Waals Heterostructures : Fabrication and Optical properties

    Mitsuhiro Okada, Yusuke Kureishi, Kenji Watanabe, Takashi Taniguchi, Hisanori Shinohara, Ryo Kitaura

    MNC2016 (29th International Microprocesses and Nanotechnology Conference)  2016.11.9 

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    Event date: 2016.11

    Language:English   Presentation type:Oral presentation (general)  

  63. Bottom-up growth and properties of high-quality transition metal dichalcogenide atomic layers on hexagonal boron nitrides

    Ryo Kitaura

    7th A3 Symposium on Emerging Materials: Nanomaterials for Electronics, Energy and Environment  2016.11.1 

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    Event date: 2016.10 - 2016.11

    Language:English   Presentation type:Oral presentation (general)  

  64. hBNサンドイッチされた高品質TMDCヘテロ積層構造の作成と評価

    岡田 光博, 渡邊賢司, 谷口尚, 篠原久典, 北浦良

    日本物理学会 2016年秋季大会  2016.9.15 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Poster presentation  

  65. 分子線エピタキシー法を用いた NbSe2 原子層の成長とその評価

    堀田 貴都, 徳田 拓人, Zhao Sihan, 渡邊 賢司, 谷口 尚, 篠原 久典, 北浦 良

    第77回応用物理学会秋季学術講演会  2016.9.13 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Poster presentation  

  66. Isoration of a missing Fullerenes Gd@C2n derivatives

    Ayano Nakagawa, Shinobu Aoyagi, Haruka Omachi, Zhiyong Wang, Katsuma Ishino, Ryo Kitaura, Hisanori Shinohara

    2016.9.9 

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    Event date: 2016.9

    Language:English   Presentation type:Poster presentation  

  67. Structure and Properties of Rare-Earth Metallofullerenes and Metallofullerene Nano-Peapods: X-ray Diffraction and Soft X-ray Magnetic Circular Dichroism Spectroscopy. International conference

    The 211th ECS meeting 

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    Event date: 2007.5

    Language:English   Presentation type:Oral presentation (invited, special)  

  68. Fabrication and properties of two-dimensional heterostructures Invited

    Kitaura, Ryo

    2021.3.19 

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  69. Building of Platforms to Explore Transport Dynamics of Excitons and Trions in Monolayer Transition Metal Dichalcogenides

    Mengsong Xue, Yuya Murai, Shaochun Zhang, Toshinori Shirafuji, Ryo Kitaura

    2021.3.3 

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  70. Transport properties of two-dimensional n/p-doped Transition Metal Dichalcogenides prepared trough a post-doping method

    Shaochun Zhang, Yuya Murai, Toshinori Shirafuji, Ryo Kitaura

    2021.3.2 

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  71. Optical properties of Zn-porphyrin covalently bounded to MoS2 and WS2

    Ruben Canton-Vitoria, Ryo Kitaura

    2021.3.2 

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▼display all

Research Project for Joint Research, Competitive Funding, etc. 1

  1. Carbon nanotube nano-reactor : synthesis, structure and properties of novel materials

    2007.9 - 2008.9

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    Grant type:Competitive

KAKENHI (Grants-in-Aid for Scientific Research) 19

  1. 原子層人工ヘテロ構造におけるバレースピン量子光学の開拓と応用

    Grant number:20H05664  2020.8 - 2025.3

    日本学術振興会  科学研究費助成事業 基盤研究(S)  基盤研究(S)

    松田 一成

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    Authorship:Coinvestigator(s) 

    本研究は、これまで互いに独立に研究が発展し交差することのなかった原子層物質科学と量子光学の学術的知見を統合し、既存のデバイス原理の延長線上にない、光量子情報デバイスに繋がる新領域「バレースピン量子光学」を創出することである。さらに、そのバレースピン量子光学を応用へと橋渡しした「バレースピン量子フォトニクス」という新しい研究潮流を生み出すことを目指している。

  2. Exploration of physics of two-dimensional superstructures

    Grant number:20H02566  2020.4 - 2023.3

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    Authorship:Principal investigator 

    Grant amount:\17680000 ( Direct Cost: \13600000 、 Indirect Cost:\4080000 )

  3. Passivation of defects in atomic layers

    Grant number:19F19368  2019.11 - 2022.3

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    Authorship:Other 

  4. 原子層物質におけるバレースピンフォトニクスの創生と応用

    Grant number:16H06331  2016.5 - 2021.3

    松田 一成

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    Authorship:Coinvestigator(s) 

    [1] 原子層物質の作製技術の確立:本年度、計画前期において成長技術や条件を確立したMOCVD、CVD法を用い新奇な原子層ヘテロ構造の作製を進めた。それにより、原子層二次元面内で3 nmの幅を有するヘテロ構造を作製する事に成功し、原理的には、二次面内での超格子構造などを作製することか可能となり研究が大きく進展した。さらに、機械剥離法で作製した原子層物質においても、h-BNで保護し作製条件を最適化する事で、高品質な半導体原子層構造を作製することが可能となった。
    [2] バレースピン検出とコヒーレント制御:これまでまでの研究において、電子と正孔からなる励起子についてバレースピン緩和時間が数10ピコ秒程度と短いものの、クーロン相互作用のスクリーニングの外部変調により、バレースピン分極を制御することに成功している。本年度は、複数の電子と正孔の束縛状態である荷電励起(トリオン)について、複数の異なる実験から、バレースピン分極が低温で1ナノ秒と非常に長い時間保持されていることが明らかとなった。現在、この荷電励起子(トリオン)について、そのバレースピン分極を制御することを念頭に入れるとともに、継続して、バレースピン分極のコヒーレント制御に向けた研究を進めている。また、半導体原子層物質と層状磁性体との原子層ヘテロ構造についても、バレースピン分極の制御などに成功している。
    [3] バレースピンフォトニクスデバイスの実現:バレースピンフォトニクスに向けた基盤技術として、バレースピン制御を利用しその情報を外部に出力するデバイスが必要となる。そのため、原子層物質と微小共振器を組み合わせ、より低い閾値で高効率に光と共振器モードを強く結合させ、高輝度な誘導放出(レーザー)に向けた研究を進めた。光ポンピングの条件では、微小共振器に閉じ込められたモードにより、誘導放出を観測することに成功している。
    本研究では、バレーとスピン自由度が結合した物性を発現しうる原子層物質を舞台に、特異な量子光学現象の解明を通してバレースピンの本質を理解する事、さらに、その知見を最大限活用しバレースピン制御を目指している。本年度の研究において「バレースピンフォトニクス」を実現するために必要な課題である、バレースピン分極の長時間保持に対して、荷電励起子(トリオン)では、低温では1ナノ秒という非常に長時間バレースピン分極が維持されているとを明らかにした。さらに、半導体原子層物質と磁性体でのバレースピン分極の制御、半導体原子層物質での微小共振器での研究など順調に研究成果が出ていることもあり、上記の判断に至った。
    [1] 原子層物質の作製技術:本年度、原子層物質・ヘテロ構造の作製において、高品質かつ特異な物性や機能発現が期待できる新たな系において、研究の進捗が見られた。こられの特徴を生かしながら、バレースピンが関与した量子光学現象に関する研究を進める。
    [2] バレースピン検出とコヒーレント制御:新たなアプローチである半導体原子層物質と層状磁性体との原子層ヘテロ構造について、バレースピン分極の制御などに成功しており、こられの一連の研究をさらに発展させる予定である。これに加え、荷電励起子(トリオン)のバレースピン分極制御やコヒーレント制御に向けた研究を進める。
    [3] バレースピンフォトニクスデバイスの実現:原子層物質と微小共振器により、より低い閾値で高効率に光と共振器モードを強く結合させ、高輝度な誘導放出(レーザー)に向けた研究を進める。特に、未だ報告がなされていない電流注入による微小共振器への閉じ込めモードの観測と、誘導放出(レーザー)に向けた研究を推進する。

  5. Fabrication and characterization of novel nano-materials using one- and two-dimentional reaction fields

    Grant number:16H06350  2016.5 - 2021.3

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    Authorship:Coinvestigator(s) 

  6. Fabrication of high-quality atomic-layer heterostructures and novel photonic devices

    Grant number:16H03825  2016.4 - 2019.3

    Kitaura Ryo

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    Authorship:Principal investigator 

    Grant amount:\19760000 ( Direct Cost: \15200000 、 Indirect Cost:\4560000 )

    In this work, we have focused on development of a crystal growth method for high-quality atomic layers and atomic-layer heterostructures. We have investigated optical responses of atomic layers and heterostructures and found (1) small-fwhm excitonic emissions, (2) formation of biexcitons with small excitation power density, (3) formation of various interlayer excitons composed of electrons and holes locate at different valleys. In addition, we have observed valley-polarized photoluminescence from both atomic layers and heterostructures, which clearly demonstrates that present samples gives versatile playground for investigation of valley-oriented phenomena and valley-photonic devices.

  7. 原子層/分子集積体ヘテロ界面を用いた機能開拓

    Grant number:16H00963  2016.4 - 2018.3

    新学術領域研究(研究領域提案型)

    北浦 良

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    Authorship:Principal investigator 

    Grant amount:\5590000 ( Direct Cost: \4300000 、 Indirect Cost:\1290000 )

    本年度は、昨年度に進めたデバイス構造の作製法についてさらなる検討を加えるとともに、作製したデバイスの電子物性計測を行った。昨年度は、(1)分子性結晶への六方晶窒化ホウ素(hBN)の転写、および(2)hBNへの分子の蒸着、の異なる二通りの方法を用いてhBN/分子性結晶の清浄な界面の作製を検討したが、(1)では清浄な界面を形成することが困難であることが明らかになったため、本年度は(2)の方法についてのみ継続して検討を行った。hBNの転写方法、デバイスの作成方法に種々の検討を加えた結果、厚さが2~3nmの数層hBN超薄膜を用いてC60/hBNの積層デバイスの作製に成功した。このデバイスにイオン液体を滴下し、hBN超薄膜でC60チャンネルを保護した電気二重層トランジスタ構造を作製した。このhBN保護電気二重層トランジスタでは、4 V程度のゲート電圧を加えてもC60が溶出せずに安定に存在しており、hBNの緻密な構造による拡散バリア層という当初のコンセプトを実証することに成功した(ゲート電圧印加前後での顕微鏡観察および分光分析の結果が全く変わらなかった)。また、この構造を用いてイオンゲートによるC60チャネルへのキャリア注入とトランジスタ動作を確認することにも成功した。ただし、3 nmとhBNが厚いためキャリア注入量が少なかったことが問題である。今後は、単層hBNをバリア層としたデバイスへの展開を行っていきたい。
    29年度が最終年度であるため、記入しない。
    29年度が最終年度であるため、記入しない。

  8. 原子層物質の内包による新規ナノリボン・ナノチューブの創製と機能開拓

    Grant number:16H02248  2016.4 - 2017.3

    篠原 久典

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    Authorship:Coinvestigator(s) 

    本研究課題を始めてから停止まで一ヶ月余りと期日が限られていたため、実質の研究の進展はほとんど無いが、以下にこれまでの進展をまとめる。
    <BR>
    単層カーボンナノチューブ (SWCNT)内部で原子層物質で最も代表的なグラフェン・ナノリボンの合成実験を開始した。グラフェン・ナノリボンの合成はジブロモ・ビアントラセンを用いた。これは、SWCNTの内部直径とジブロモ・ビアントラセンの幅は丁度フィットするためである。SWCNTへの内包は昇華法を用いた。透過型電子顕微鏡(TEM)観察では、SWCNT内部に内包されたジブロモ・ビアントラセンを確認することが出来た。今後は、これを高温熱処理をして実際にSWCNT内部でグラフェン・ナノリボンが生成されるかをTEM観察する。
    28年度が最終年度であるため、記入しない。
    28年度が最終年度であるため、記入しない。

  9. Fabrication and electronic properties of Atomic-layer metals

    Grant number:15K13283  2015.4 - 2017.3

    Kitaura Ryo

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    Authorship:Principal investigator 

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    In this work, we have developed growth method of atomic-layer metals to explore electronic properties, in particular, superconductivity in these metals. For this purpose, we have focused on NbS2 and NbSe2, layered metals know as superconductors, and chemical vapor deposition and molecular beam epitaxy method. Through this work, we have successfully grown monolayer NbS2 and NbSe2. Selective growth of monolayer NbSe2 via MBE growth is particularly important for future investigation of superconductivity in 2-dimensional limit.

  10. Development of novel large-area synthetic methods of graphene-related atomic layers

    Grant number:25107002  2013.6 - 2018.3

    Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Kusunoki Michiko

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    Authorship:Coinvestigator(s) 

    Through deep discussion between synthetic researchers in the synthesis team, (1)Chemical vapor deposition groups attained synthesis of not only large-area but also high-quality graphene consisting of grains of over 5 nm, also did high speed synthesis for practical application, and single layer WS2 on h-BN substrate showing photoluminescence with narrow width of 22 meV, (2)SiC thermal decomposition group succeeded in synthesizing graphene with wafer size and developed the Rapid cooling method for free standing of graphene on SiC substrate, (3) oxidized graphene films deposited on h-BN films was irradiated by methane plasma, which led to high mobility of 4000-7000cm2/Vs, (4)Organic synthesis group attained synthesis of novel graphene ribbons successively and increase of near infrared radiation. Active supplying these samples to researchers in the other teams and foreign countries led to publishing 130 papers due to the collaborating researches.

  11. Direct observation of molecules in liquids with graphene-liquid cells

    Grant number:25708002  2013.4 - 2017.3

    Kitaura Ryo

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    Authorship:Principal investigator 

    Grant amount:\25740000 ( Direct Cost: \19800000 、 Indirect Cost:\5940000 )

    The purpose of this work is development of the fabrication method of graphene-liquid cells, which can be used to observe various molecules in liquid with TEM. For this purpose, we have developed (1) growth method of high-quality large-area graphene, (2) clean transfer method of the CVD-grown graphene, and (3) reliable method for liquid-encapsulated graphene cell structure.

  12. Observation of biomolecules using a graphene environmental cell

    2013.4 - 2015.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists(A)

  13. Preparation and characterization of nano graphenes by e-beam nano fabrication technique

    Grant number:23655125  2011 - 2012

    KITAURA Ryo

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    Authorship:Principal investigator 

    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    We have fabricated various nano graphenes by top-down method (e-beam-nano-fabrication method). The e-beam-nano-fabrication method has been performed in transmission electron microscope, which enables us to characterize structure of fabricated nano graphenes at atomic level. In addition, we have developed new TEM sample holder having electric contacts to perform electric conductivity measurements simultaneously.

  14. Fabrication and Characterization of Carbon Nanotubes Encapsulating Atomic Nanowires

    Grant number:22225001  2010.4 - 2015.3

    SHINOHARA Hisanori

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    Authorship:Coinvestigator(s) 

    The present research deals with fabrication and characterization of new types of carbon nanotubes (CNTs), which encapsulate various tyepes of the so-called atomic nanowires such as metal nanowires, nano-diamond nanowires, BN-nanotube nanowire and ultra-thin graphene nanoribbon nanowires. All of these newly fabricated CNTs exhibit some some novel electronic and magnetic properties. Such new propeties are primariy due to the interaction exerted between the nanowires and CNTs.

  15. ハイブリッドナノチューブを軸とした新規物質の創製と構造・物性評価法の開発

    2009.4 - 2010.3

    科学研究費補助金  若手研究B

    北浦良

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    Authorship:Principal investigator 

  16. Fabrication of novel nanotube-based hybrid materials and development of characterization of their structure and properties

    Grant number:21750142  2009 - 2010

    KITAURA Ryo

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    Authorship:Principal investigator 

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    Atomic nanowires have been synthesized using ultra-thin 1-dimensional nanospace of carbon nanotubes. One of the key to achieve the formation of atomic wire inside nanotube nanospace is to use high quality and high purity carbon nanotubes synthesized by laser vaporization and chemical vapor deposition method. Synthesized atomic wires have a diameter of one atom thick at thinnest, which is the world thinnest wires among ever synthesized. In the case of atomic wires whose diameter is two-atom thick, I have found that the reversible structural transformation from zigzag structure and helical structure occurs during TEM observations at room temperature. In addition to synthesis of novel nanocarbon materials, I have developed characterization technique using micro-gap electrodes with channel penetrating though the substrate to elucidate correlation between structure and properties of atomic wires in detail. Using this method, atomic structure characterization using electron microscopy and device characteristics measurement on individual and specific nanotubes have been successfully carried out.

  17. Fabrication of Synthesis of Novel Carbon Nanotube Hybrids

    Grant number:19054008  2007 - 2011

    SHINOHARA Hisanori

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    Authorship:Coinvestigator(s) 

    Novel carbon nanotube (CNT) hybrid materials have been successfully fabricated, which include metal-nanowire encapsulating CNT and graphene nanoribbon (GNR) encapsulating CNT. By using high-resolution transmission electron microscopy (TEM), we were able to observed individual metal atoms aligned within the CNTs, where the metal atoms oftentimes exhibit helical alignment in the nanotubes. By using a specially developed separation technique of metal-semiconductior CNTs, we can obtain very pure (>99%) semiconducting CNT. The thin-film transistors (TFT) with these pure semiconducting CNTs, we have been successful in achieving very high mobility together with high on/off ratios in the transistor performance. These achievement have been widely reported by the Japanese mass media, which include Asahi, Yomiuri, Mainichi, Nikkei and Chunichi newspapers.

  18. Fabrication and Characterization of DNA-Wrapped Carbon Nanotubes

    Grant number:19205003  2007 - 2009

    SHINOHARA Hisanori

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    Authorship:Coinvestigator(s) 

    DNA-wrapped single-wall carbon nanotubes (SWNTs) and double-wall carbon nanotubes (DWNTs) have been synthesized and are length-separated by high-performance liquid chromatography (HPLC) with a specially designed HPLC column. Furthermore, we have found that DNA-wrapped SWNTs provides an effective, scalable way to fabricate the super-uniform networks of highly isolated, structure-sorted SWNTs for thin-film transistors (TFTs). The DNA-SWNTs are easily formed into uniform, desired-density networks of individual nanotubes. By tuning the nanotube density, the TFTs with an on/off ratio of 10^3-10^5 can easily be achieved even without the removal of metallic SWNTs.

  19. Syntheses of Novel Metallofullerene Nano-Peapods

    Grant number:16350071  2004 - 2005

    SHINOHARA Hisanori

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    Authorship:Coinvestigator(s) 

    One of the fascinating features of metallofullerene-peapods such as Gd@C_<82>, Ce@C_<82> and Ti@C_<82> peapods is that one can perform a 'local band gap engineering' at the site where metallofullerenes are endothermally inserted. TEM and STM images together with electron energy loss spectra have suggested that the metallofullerenes can be spaced regularly as close as 1.1nm in a high-density 'peapod' structure, while 1.1-3nm spacing has often been observed in a low-density peapod. About 10% of over 200 SWNT images showed locally modified semiconducting band gaps. We found that the synthetic yield of metallofullerene peapods varies considerably from one fullerene to another.
    In many cases, these nano-peapods have found to exhibit structural and electronic properties which are not normally observed in conventional carbon nanotubes. The novelty in electronic structure for the peapods comes mainly from hole or electron doping to the nanotubes from the encaged molecules.
    Furthermore, metallofullerene-peapods have exhibited ambipolar FET behavior with both n- and p-channels easily accessible by simple electrostatic gates. Similar results were obtained from more than 10 independent devices composed of a small bundle of metallofullerene peapods. Because the encaged metallofullerenes provide 2-6 electrons to the carbon nanotubes (electron-doping), the electronic transport properties of these peapods can drastically be altered with respect to the intact nanotubes.

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Industrial property rights 1

  1. カーボンナノチューブの製造方法

    伊丹 健一郎, 瀬川 泰知, 篠原 久典, 北浦 良

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    Applicant:国立大学法人名古屋大学

    Application no:特願2013-503617  Date applied:2012.3

    Patent/Registration no:特許第6086387号  Date issued:2017.2

    J-GLOBAL

 

Teaching Experience (On-campus) 6

  1. 無機・物化機器分析

    2012

  2. 化学講究

    2012

  3. 化学基礎 I

    2012

  4. Fundamentals of Chemistry I

    2011

  5. 化学講究

    2011

  6. 無機・物化機器分析

    2011

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Teaching Experience (Off-campus) 1

  1. 化学講究

    Nagoya University)

 

Social Contribution 1

  1. SSH理科特別授業

    Role(s):Lecturer

    2015.6

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    Audience: High school students

    Type:Lecture