Updated on 2024/09/25

写真a

 
YOSHIDA, Tomoko
 
Organization
Graduate School of Engineering Applied Energy 2 Professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Energy Science and Engineering
Title
Professor

Degree 1

  1. 工学博士

Research Areas 6

  1. Others / Others  / Atomic Power Studies

  2. Others / Others  / Structural/Functional Materials

  3. Others / Others  / Catalyst/Resource Chemical Process

  4. Others / Others  / Inorganic Industrial Material

  5. Others / Others  / Functional Material Chemistry

  6. Others / Others  / Physical Chemistry

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Current Research Project and SDGs 2

  1. 量子線照射により発現する固体機能に関する研究

  2. Study on irradiation damage of solid materials

Research History 9

  1. Nagoya University   Professor

    2024.4

  2. Osaka Metropolitan University   Research Center for Artificial Photoshynthesis   Professor

    2022.4 - 2024.3

  3. Osaka Metropolitan University   Research Center for Artificial Photoshynthesis

    2022.4 - 2024.3

  4. Osaka City University   Research Center for Artificial Photoshynthesis   Professor

    2020.4 - 2022.3

  5. Osaka City University   Research Center for Artificial Photoshynthesis

    2015.4 - 2022.3

  6. Osaka City University   Professor

    2015.4 - 2020.3

  7. Nagoya University   Associate professor

    2009.4 - 2015.3

  8. Nagoya University   Associate Professor

    2003.7 - 2009.3

  9. Nagoya University   Assistant

    1996.6 - 2003.6

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Education 3

  1. Kyoto University   Graduate School, Division of Engineering

    1993.4 - 1996.3

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    Country: Japan

  2. Kyoto University   Graduate School of Engineering

    1991.4 - 1993.3

  3. Kyoto University

    1987.4 - 1991.3

Professional Memberships 7

  1. 日本分析化学会

    2018.4

  2. 日本原子力学会

    1996.4

  3. 触媒学会

  4. 日本金属学会

  5. 日本放射光学会

  6. 日本希土類学会

  7. 日本化学会

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Awards 6

  1. 女性Analyst賞

    2023.7   日本分析化学会  

  2. 教員活動表彰(研究の部)

    2019.6   大阪市立大学  

  3. 岡村賞(女性研究者特別賞)

    2017.12   大阪市立大学  

  4. International Symposium on Creation and Control of Advanced Selective Catalysis, Best Poster Presentation

    2008.7   International Symposium on Creation and Control of Advanced Selective Catalysis  

  5. 日本顕微鏡学会第64回学術講演会女性研究者ポスター賞

    2008.5   日本顕微鏡学会  

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    Country:Japan

  6. 触媒学会創立50周年記念大会優秀ポスター賞

    2008.3   触媒学会  

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    Country:Japan

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Papers 190

  1. Establishment of Quantitative Local Structural/Electronic State Analyses Based on X-ray Absorption Spectroscopy and Development for Their Multiple <i>In-situ</i> Analysis

    YOSHIDA Tomoko

    BUNSEKI KAGAKU   Vol. 73 ( 7.8 ) page: 369 - 380   2024.7

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    Language:Japanese   Publisher:The Japan Society for Analytical Chemistry  

    <p>Quantitative analysis using X-ray absorption spectroscopy and multiple <i>in-situ</i> analysis were developed to understand the local structures and electronic states of the sub-nm and nm sized active species on the solid catalyst surface and their dynamic change processes during the reaction. Proposed in this study are linear analysis methods by superposition and subtraction of a XANES spectrum as well as a deconvolution method of the XANES fine structure with two sets of a Lorentzian for a white line and an arctangent function for a continuum absorption, which enabled the quantitative evaluation of active species with different electronic states and coordination symmetries. Introducing a high spatial resolution imaging technique using TEM/EELS to the above XANES analyses, the visualization method for the spatial distribution of active species was realized. In addition, a combination of <i>in-situ</i> spectroscopy such as XAFS, FT-IR, UV-vis optical absorption allowed for the elucidation of the mechanisms of catalytic reactions such as artificial photosynthesis and decomposition of organic compounds.</p>

    DOI: 10.2116/bunsekikagaku.73.369

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  2. Synthesis of Au-Nanoparticles on Carbon using Lysine as a Capping Agency in a Gas Diffusion Electrodes Cell for Electrocatalytic CO2 Reduction Reviewed

    Muneaki Yamamoto, Keigo Komoguchi, Fuki Koyama, Tetsuo Tanabe, Tomoko Yoshida

    Catalysis Letters   Vol. 154 ( 6 ) page: 2648 - 2657   2024.6

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10562-023-04538-1

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    Other Link: https://link.springer.com/article/10.1007/s10562-023-04538-1/fulltext.html

  3. Effects of Al2O3 and MgAl2O4 Support on Photocatalytic Activity of Ga2O3 in CO2 Reduction with Water Reviewed

    Kyoshiro Ichikawa, Tomomi Aoki, Masato Akatsuka, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    Catalysis Letters   Vol. 154 ( 5 ) page: 2008 - 2022   2024.5

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10562-023-04424-w

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    Other Link: https://link.springer.com/article/10.1007/s10562-023-04424-w/fulltext.html

  4. Establishment of Quantitative Local Structural/Electronic State Analyses Based on X-ray Absorption Spectroscopy and Development for Their Multiple<i> In</i><i>-situ</i> Analysis

    Yoshida, T

    BUNSEKI KAGAKU   Vol. 73 ( 7 ) page: 369 - 380   2024

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  5. Photoelectrochemical properties of plasma-induced nanostructured tungsten oxide (vol 580, 151979, 2022)

    Feng, SY; Kajita, S; Higashi, M; Bieberle-Hutter, A; Yoshida, T; Ohno, N

    APPLIED SURFACE SCIENCE   Vol. 599   2022.10

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    Publisher:Applied Surface Science  

    The authors regret, the affiliation of Masanobu Higashi is wrong. The correct affiliation is updated as above. The authors would like to apologise for any inconvenience caused.

    DOI: 10.1016/j.apsusc.2022.153668

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  6. Photoelectrochemical properties of plasma-induced nanostructured tungsten oxide Reviewed

    Shuangyuan Feng, Shin Kajita, Masanobu Higashi, Anja Bieberle-Hütter, Tomoko Yoshida, Noriyasu Ohno

    Applied Surface Science   Vol. 580   page: 151979 - 151979   2022.4

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.apsusc.2021.151979

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  7. Fabrication of a stable CdS photoanode for photoelectrochemical CO<sub>2</sub> reduction under visible-light irradiation Reviewed

    Masanobu Higashi, Itsuki Tanaka, Yutaka Amao, Tomoko Yoshida

    New Journal of Chemistry   Vol. 46 ( 13 ) page: 5932 - 5938   2022.3

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    A CdS photoanode with a smooth surface can stably oxidize [Fe(CN)<sub>6</sub>]<sup>4−</sup> by densely forming K<sub>2</sub>Cd[Fe(CN)<sub>6</sub>] on the CdS surface during photocorrosion.

    DOI: 10.1039/d1nj06073b

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  8. Synthesis of meso-porous α-Ga<sub>2</sub>O<sub>3</sub> from liquid Ga metal having significantly high photocatalytic activity for CO<sub>2</sub> reduction with water Reviewed

    Tomomi Aoki, Kyoshiro Ichikawa, Kenta Sonoda, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    RSC Advances   Vol. 12 ( 12 ) page: 7164 - 7167   2022.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    Meso-porous α-Ga<sub>2</sub>O<sub>3</sub> showing quite high photocatalytic activity for CO<sub>2</sub> reduction with water is successfully synthesized from liquid Ga metal.

    DOI: 10.1039/d1ra09039a

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  9. Mixed phases of GaOOH/β-Ga<sub>2</sub>O<sub>3</sub> and α-Ga<sub>2</sub>O<sub>3</sub>/β-Ga<sub>2</sub>O<sub>3</sub> prepared by high energy ball milling as active photocatalysts for CO<sub>2</sub> reduction with water Reviewed

    Tomomi Aoki, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    New Journal of Chemistry   Vol. 46 ( 7 ) page: 3207 - 3213   2022.2

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    The H<sub>2</sub> production rates increased with SSA, irrespective of the phases, while the CO production rates increased with the abundance of α-Ga<sub>2</sub>O<sub>3</sub>.

    DOI: 10.1039/d1nj05245d

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  10. Structural and Chemical State Analyses on Nitrided GaOOH as a Visible Light Response Photocatalyst

    Yamamoto Muneaki, Kato Yuma, Yagi Shinya, Tanabe Tetsuo, Yoshida Tomoko

    e-Journal of Surface Science and Nanotechnology   Vol. 20 ( 1 ) page: 1 - 6   2022.2

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Vacuum and Surface Science  

    <p> To prepare photocatalysts promoting water splitting under visible light irradiation, GaOOH was nitrided by the calcination at a temperature ranging from 773 to 1273 K under a NH<sub>3</sub> flow to produce nitrogen doped Ga<sub>2</sub>O<sub>3</sub>. X-ray diffraction measurements suggested that even under NH<sub>3</sub> atmosphere dehydration of GaOOH to α-Ga<sub>2</sub>O<sub>3</sub> occurred by calcining below 873 K. In the samples nitrided above 973 K, gallium nitride (GaN) phase started to appear and the crystallinity became better with increasing the nitriding temperature. In diffuse reflectance ultraviolet-visible measurements, absorption bands appeared in the visible light region after the nitrization, and the shift of the absorption edge with nitriding temperature suggested the formation of a new phase like gallium oxy-nitride. X-ray photoelectron spectroscopy and scanning transmission electron microscopy-electron energy-loss spectroscopy analyses revealed that oxygen atoms were distributed homogeneously and mixed with nitrogen atoms in the sample nitrided at 1173 K [referred as S(1173 K)] while oxygen atoms were mainly distributed at the surface of the sample nitrided at 1273 K [S(1273 K)]. The differences in the composition and chemical state near the sample surface closely related to the activity and stability during water splitting reaction under visible light irradiation between S(1173 K) and S(1273 K), i.e., the former sample provided stable H<sub>2</sub> and O<sub>2</sub> evolution while the latter sample was inactive and unstable. </p>

    DOI: 10.1380/ejssnt.2022-003

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  11. Influence of Ag Clusters on the Electronic Structures of β-Ga<sub>2</sub>O<sub>3</sub> Photocatalyst Surfaces Reviewed

    Muneaki Yamamoto, Akihide Kuwabara, Tomoko Yoshida

    ACS Omega   Vol. 6 ( 49 ) page: 33701 - 33707   2021.12

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsomega.1c04730

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  12. Real time measurements of UV-vis diffuse reflectance of silver nanoparticles on gallium oxide photocatalyst Reviewed

    Daiki Kitajima, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    Catalysis Today   Vol. 375   page: 501 - 505   2021.9

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.cattod.2020.04.063

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  13. Enhanced photocatalytic ethylene decomposition with anatase-rutile mixed nanostructures formed by He plasma treatment Reviewed

    Shin Kajita, Kazuya Miyaguchi, Hirohiko Tanaka, Eriko Yasunaga, Tomoko Yoshida, Noriyasu Ohno

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 418   2021.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    In order to realize high-performance titanium dioxide (TiO2) photocatalysts for ethylene decomposition, titanium (Ti) thin film samples with fiberform nanostructures were prepared by helium (He) plasma treatment. Then, the oxidation condition for ethylene decomposition were optimized in terms of the oxidation temperature and duration. It is shown that He plasma irradiation with Ti deposition followed by oxidation in the air formed anatase-rich TiO2. The rutile anatase transition temperature increased to higher than 1000 K on the He treated samples and the best photocatalytic performance is twice higher than that on TiO2 sample formed in a magnetron sputtering device. Helium plasma treatment induces vacancies, He clusters, and He bubbles together with formation of nanostructures. The results suggested that those morphology changes lead to the formation of stable anatase structure, which is likely the key factor for the enhancement of photocatalytic activity. Based on the obtained ethylene decomposition rate, we will discuss the necessary light source and amount of photocatalysts to keep vegetables fresh in a long-distance transport cargo.

    DOI: 10.1016/j.jphotochem.2021.113420

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  14. Synthesis of α-Ga<sub>2</sub>O<sub>3</sub> by Water Oxidation of Metallic Gallium as a Photocatalyst for CO<sub>2</sub> Reduction with Water Reviewed

    Kenta Sonoda, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    ACS Omega   Vol. 6 ( 29 ) page: 18876 - 18880   2021.7

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

    DOI: 10.1021/acsomega.1c02088

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  15. The role of the shell in core-shell-structured La-doped NaTaO3photocatalysts Reviewed

    Hanggara Sudrajat, Mitsunori Kitta, Ryota Ito, Tomoko Yoshida, Ryuzi Katoh, Bunsho Ohtani, Nobuyuki Ichikuni, Hiroshi Onishi

    Physical Chemistry Chemical Physics   Vol. 23 ( 14 ) page: 8868 - 8879   2021.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry  

    NaTaO3, a semiconductor with a perovskite structure, has long been known as a highly active photocatalyst for overall water splitting when appropriately doped with La cations. A profound understanding of the surface feature and why and how it may control the water splitting activity is critical because redox reactions take place at the surface. One surface feature characteristic of La-doped NaTaO3is a La-rich layer (shell) capping La-poor bulk (core). In this study, we investigate the role of the shell in core-shell-structured La-doped NaTaO3through systematic chemical etching with an aqueous HF solution. We find that the La-rich shell plays a role in electron-hole recombination, electron mobility and water splitting activity. The shallow electron traps populating the La-rich shell trap the photoexcited electrons, decreasing their mobility. The shallowly trapped electrons remain reactive and are readily available on the surface to be extracted by the cocatalysts for the reduction reaction evolving H2. The presently employed chemical etching method also confirms the presence of a La concentration gradient in the core that regulates the steady-state electron population and water splitting activity. Here, we successfully reveal the nanoarchitecture-photoactivity relationship of core-shell-structured La-doped NaTaO3that thereby allows tuning of the surface features and spatial distribution of dopants to increase the concentration of photoexcited electrons and therefore the water splitting activity. By recognizing the key factors that control the photocatalytic properties of a highly active catalyst, we can then devise proper strategies to design new photocatalyst materials with breakthrough performances.

    DOI: 10.1039/d1cp00375e

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  16. Report on the 56<sup>th</sup> Annual Conference on X-ray Chemical Analysis

    YOSHIDA Tomoko

    Advances in X-Ray Chemical Analysis, Japan   Vol. 52 ( 0 ) page: 261 - 265   2021.3

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    Language:Japanese   Publisher:The Discussion Group of X-Ray Analysis, The Japan Society for Analytical Chemistry  

    DOI: 10.57415/xshinpo.52.0_261

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  17. Synthesis of nanometer-sized gallium oxide using graphene oxide template as a photocatalyst for carbon dioxide reduction Reviewed

    Kenta Sonoda, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    Applied Surface Science   Vol. 542   page: 148680 - 148680   2021.3

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.apsusc.2020.148680

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  18. Increase in CO2 reduction rate via optical near-field effect Reviewed

    Takashi Yatsui, Yuki Nakamura, Yosuke Suzuki, Tatsuki Morimoto, Yuma Kato, Muneaki Yamamoto, Tomoko Yoshida, Wataru Kurashige, Nobuyuki Shimizu, Yuichi Negishi, Kenji Iida, Katsuyuki Nobusada

    Journal of Nanophotonics   Vol. 14 ( 4 )   2020.10

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    Publishing type:Research paper (scientific journal)   Publisher:SPIE-Intl Soc Optical Eng  

    DOI: 10.1117/1.JNP.14.046011

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  19. Mineralization induced by phosphorylated dry baker’s yeast Reviewed

    Yoshihiro Ojima, Maya Kihara, Mami Yoshida, Koichi Igarashi, Tomoko Yoshida, Masayuki Azuma

    PLOS ONE   Vol. 15 ( 9 ) page: e0239774 - e0239774   2020.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Public Library of Science (PLoS)  

    DOI: 10.1371/journal.pone.0239774

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  20. Effects of the amount of Au nanoparticles on the visible light response of TiO2 photocatalysts Reviewed

    Tomoko Yoshida, Yuhei Misu, Muneaki Yamamoto, Tetsuo Tanabe, Jun Kumagai, Satoshi Ogawa, Shinya Yagi

    Catalysis Today   Vol. 352   page: 34 - 38   2020.8

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.cattod.2019.12.035

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  21. Water-Splitting Activity of La-Doped NaTaO<sub>3</sub> Photocatalysts Sensitive to Spatial Distribution of Dopants Reviewed

    Hanggara Sudrajat, Mitsunori Kitta, Ryota Ito, Sota Nagai, Tomoko Yoshida, Ryuzi Katoh, Bunsho Ohtani, Nobuyuki Ichikuni, Hiroshi Onishi

    The Journal of Physical Chemistry C   Vol. 124 ( 28 ) page: 15285 - 15294   2020.7

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

    DOI: 10.1021/acs.jpcc.0c03822

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  22. Thin film and noble metal loading effects on the photocatalytic reactivity of helium-plasma-induced nanostructured tungsten oxides Reviewed

    Shuangyuan Feng, Shin Kajita, Tomoko Yoshida, Noriyasu Ohno, Daisuke Nagata, Masayuki Tokitani

    Materials Research Express   Vol. 7 ( 7 ) page: 075007 - 075007   2020.7

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    Helium-plasma irradiation induces nanostructure formation on metal surfaces. This study investigated the photocatalytic performance of tungsten (W) oxide nanostructures formed on a thin film and the loading effects of noble metals. Methylene blue (MB) degradation was performed, and the performance of different nanostructured samples formed on thin-film and sheet W with changing the oxidization temperatures was compared; the differences were discussed in terms of the oxidation degree and vacancies. Moreover, noble metals (Pt, Ag, Au) were loaded onto the nanostructured sample oxide by magnetron sputtering as cocatalysts. The MB degradation ability was significantly enhanced by Pt loading. The results showed that nanostructuring and Pt support by using dry processes are novel routes for fabricating highly active photocatalysts.

    DOI: 10.1088/2053-1591/aba394

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    Other Link: https://iopscience.iop.org/article/10.1088/2053-1591/aba394/pdf

  23. Photocatalytic Activity of Metal Oxide Supported Gallium Oxide for CO<sub>2</sub> Reduction with Water

    Ito Ryota, Akatsuka Masato, Ozawa Akiyo, Yamamoto Muneaki, Tanabe Tetsuo, Yoshida Tomoko

    Bulletin of the Chemical Society of Japan   Vol. 93 ( 5 ) page: 694 - 700   2020.5

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Chemical Society of Japan  

    <p>We have examined photocatalytic activities of Ga<sub>2</sub>O<sub>3</sub> supported by various metal oxides for water splitting and CO<sub>2</sub> reduction with water under UV light irradiation. The Ga<sub>2</sub>O<sub>3</sub> photocatalyst supported by metal oxides was prepared by an impregnation method. We have found that some oxides used as a supporting oxide of Ga<sub>2</sub>O<sub>3</sub> photocatalyst improve activities of water splitting and CO<sub>2</sub> reduction. In particular, the CO production rates are well correlated to various properties of the supporting oxide. These oxides satisfy the following three criteria significantly enhancing the CO production rate. (1) Their band gap is wider than that of Ga<sub>2</sub>O<sub>3</sub> and the position of its conduction band is at a negative potential with respect to that of Ga<sub>2</sub>O<sub>3</sub>. (2) They are not miscible with Ga<sub>2</sub>O<sub>3</sub> and (3) mixed phases of α and γ or defective γ phase of Ga<sub>2</sub>O<sub>3</sub> are well dispersed on them exhibiting columnar shape. These criteria would be useful for further improvement of the activity for photocatalytic CO<sub>2</sub> reduction with water by Ga<sub>2</sub>O<sub>3</sub>.</p>

    DOI: 10.1246/bcsj.20190366

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  24. Comparison of platinum photodeposition processes on two types of titanium dioxide photocatalysts Reviewed

    Muneaki Yamamoto, Yasuhiro Minoura, Masato Akatsuka, Satoshi Ogawa, Shinya Yagi, Akira Yamamoto, Hisao Yoshida, Tomoko Yoshida

    Physical Chemistry Chemical Physics   Vol. 22 ( 16 ) page: 8730 - 8738   2020.4

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    <p>The photodeposition method is useful for the preparation of metal-loaded photocatalysts, by which the metal precursors are adsorbed on the photocatalyst surface and reduced by photoexcited electrons to typically form metallic nanoparticles.</p>

    DOI: 10.1039/c9cp06988g

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  25. Roles of Silver Co-catalyst on Gallium Oxide for Photocatalytic CO<sub>2</sub> Reduction to CO

    Yoshioka Kokoro, Yamamoto Muneaki, Tanabe Tetsuo, Yoshida Tomoko

    e-Journal of Surface Science and Nanotechnology   Vol. 18 ( 0 ) page: 168 - 174   2020.4

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Vacuum and Surface Science  

    <p>It is well known that Ag loaded Gallium oxide (Ag/Ga<sub>2</sub>O<sub>3</sub>) promotes photocatalytic CO<sub>2</sub> reduction to CO. However, the role of the Ag co-catalyst in the CO<sub>2</sub> reduction has not been clarified. We have intended to find the relationship between the state of Ag loaded on Ga<sub>2</sub>O<sub>3</sub> and their activity for the photocatalytic CO<sub>2</sub> reduction. To achieve this, we have tried to control and stabilize the loading state of Ag on Ga<sub>2</sub>O<sub>3</sub> during their use for the photocatalytic CO<sub>2</sub> reduction by adding methanol as a reducing agent. It is confirmed that methanol stabilizes the particle sizes of Ag nanoparticles (Ag-NPs) loaded on Ga<sub>2</sub>O<sub>3</sub> under the photocatalytic CO<sub>2</sub> reduction condition and is hardly decomposed to produce CO. Using Ga<sub>2</sub>O<sub>3</sub> loaded with size-controlled Ag-NPs as a photocatalyst for the CO<sub>2</sub> reduction, it is found that Ag-NPs with their sizes within 10—30 nm are active sites for the photocatalytic CO<sub>2</sub> reduction and the catalytic activity linearly increases with the increase of the number density of Ag-NPs. However, a higher Ag loading amount over 1.0 wt% promotes aggregation of Ag to be larger metal particles over 70 nm which are not active for the CO<sub>2</sub> reduction.</p>

    DOI: 10.1380/ejssnt.2020.168

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  26. Black phosphorus synthesized by solvothermal reaction from red phosphorus and its catalytic activity for water splitting Reviewed

    Akiyo Ozawa, Muneaki Yamamoto, Tetsuo Tanabe, Saburo Hosokawa, Tomoko Yoshida

    Journal of Materials Chemistry A   Vol. 8 ( 15 ) page: 7368 - 7376   2020.4

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    <p>We have succeeded in synthesizing black phosphorus employing a one-pot solvothermal reaction of red phosphorous and ethylenediamine used as a solvent.</p>

    DOI: 10.1039/c9ta13441g

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  27. Utilization of La<sub>2</sub>O<sub>3</sub> as a Support of Ga<sub>2</sub>O<sub>3</sub> Photocatalyst to Enhance Activity on CO<sub>2</sub> Reduction with Water

    Ito Ryota, Akatsuka Masato, Yamamoto Muneaki, Tanabe Tetsuo, Yoshida Tomoko

    e-Journal of Surface Science and Nanotechnology   Vol. 18 ( 0 ) page: 110 - 115   2020.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Vacuum and Surface Science  

    <p>We have prepared La<sub>2</sub>O<sub>3</sub> supported Ga<sub>2</sub>O<sub>3</sub> (Ga<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub>) photocatalyst to improve the photocatalytic activity of Ga<sub>2</sub>O<sub>3</sub> for CO<sub>2</sub> reduction with water under ultraviolet light irradiation without a noble metal cocatalyst. Significant improvement on both CO<sub>2</sub> reduction and water splitting was attained compared with those for non-supported Ga<sub>2</sub>O<sub>3</sub> and La<sub>2</sub>O<sub>3</sub>. The improvement is attributed to the transformation of the La<sub>2</sub>O<sub>3</sub> surface to NaLa(CO<sub>3</sub>)<sub>2</sub> during the photocatalytic reduction tests in aqueous solution of NaHCO<sub>3</sub>. NaLa(CO<sub>3</sub>)<sub>2</sub> was preferentially formed on the surface of La<sub>2</sub>O<sub>3</sub> without changing Ga<sub>2</sub>O<sub>3</sub> resulting in the structure of Ga<sub>2</sub>O<sub>3</sub> supported by NaLa(CO<sub>3</sub>)<sub>2</sub>. Once NaLa(CO<sub>3</sub>)<sub>2</sub> fully covered the surface of La<sub>2</sub>O<sub>3</sub>, the high catalytic activity was kept long.</p>

    DOI: 10.1380/ejssnt.2020.110

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  28. Preparation of Ga2O3 photocatalyst highly active for CO2 reduction with water without cocatalyst Reviewed

    Masato Akatsuka, Yu Kawaguchi, Ryota Itoh, Akiyo Ozawa, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    Applied Catalysis B: Environmental   Vol. 262   page: 118247 - 118247   2020.3

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.apcatb.2019.118247

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  29. Photocatalytic application of helium plasma induced nanostructured tungsten oxides Reviewed

    Shuangyuan Feng, Shin Kajita, Yudai Tomita, Tomoko Yoshida, Noriyasu Ohno

    Japanese Journal of Applied Physics   Vol. 59 ( SA ) page: SAAB04 - SAAB04   2020.1

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    DOI: 10.7567/1347-4065/ab4601

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  30. TiO<sub><i>x</i></sub>N<sub><i>y</i></sub>/TiO<sub>2</sub> Photocatalyst for Hydrogen Evolution under Visible Light Irradiation II Degradation of Photocatalytic Activity of TiO<sub><i>x</i></sub>N<sub><i>y</i></sub>/TiO<sub>2</sub> with Mild Oxidation Reviewed

    Akiyo Ozawa, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    ACS Omega   Vol. 4 ( 24 ) page: 20430 - 20434   2019.12

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    DOI: 10.1021/acsomega.9b02979

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  31. TiO<i><sub>x</sub></i>N<i><sub>y</sub></i>/TiO<sub>2</sub> Photocatalyst for Hydrogen Evolution under Visible-Light Irradiation. I: Characterization of N in TiO<i><sub>x</sub></i>N<i><sub>y</sub></i>/TiO<sub>2</sub> Photocatalyst Reviewed

    Akiyo Ozawa, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    ACS Omega   Vol. 4 ( 24 ) page: 20424 - 20429   2019.12

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    DOI: 10.1021/acsomega.9b02977

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  32. A Nickel‐Diamine/Mesoporous Silica Composite as a Heterogeneous Chiral Catalyst for Asymmetric 1,4‐Addition Reactions Reviewed

    Haruro Ishitani, Kan Kanai, Woo‐Jin Yoo, Tomoko Yoshida, Shū Kobayashi

    Angewandte Chemie International Edition   Vol. 58 ( 38 ) page: 13313 - 13317   2019.9

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    Abstract

    A chiral composite material, derived from the deposition of a chiral nickel–diamine complex via wet impregnation to MCM‐41, was shown to be an efficient heterogeneous catalyst for asymmetric 1,4‐addition reactions of 1,3‐dicarbonyl compounds with nitroalkenes, and of nitromethane with alkylidenemalonates. It was discovered that MCM‐41 enhanced the reactivity and improved the stability of the chiral nickel complex that resides within the mesoporous material.

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.201906349

  33. Realization of red shift of absorption spectra using optical near-field effect Reviewed

    Takashi Yatsui, Yusuke Nakahira, Yuki Nakamura, Tatsuki Morimoto, Yuma Kato, Muneaki Yamamoto, Tomoko Yoshida, Kenji Iida, Katsuyuki Nobusada

    Nanotechnology   Vol. 30 ( 34 ) page: 34LT02 - 34LT02   2019.8

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    DOI: 10.1088/1361-6528/ab2092

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  34. Air-stable and reusable cobalt ion-doped titanium oxide catalyst for alkene hydrosilylation Reviewed

    Takato Mitsudome, Shu Fujita, Min Sheng, Jun Yamasaki, Keita Kobayashi, Tomoko Yoshida, Zen Maeno, Tomoo Mizugaki, Koichiro Jitsukawa, Kiyotomi Kaneda

    Green Chemistry   Vol. 21 ( 16 ) page: 4566 - 4570   2019.8

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    <p>Air-stable and highly reusable cobalt ion-doped titanium oxide catalyst was developed for alkene hydrosilylation.</p>

    DOI: 10.1039/c9gc01981b

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  35. Preparation of visible-light-responsive photocatalyst by dehydronitrization of gallium oxide hydroxide for hydrogen evolution from water Reviewed

    Yuma Kato, Muneaki Yamamoto, Akiyo Ozawa, Tetsuo Tanabe, Tomoko Yoshida

    Applied Catalysis B: Environmental   Vol. 250   page: 112 - 116   2019.8

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    DOI: 10.1016/j.apcatb.2019.03.009

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  36. Electron Population and Water Splitting Activity Controlled by Strontium Cations Doped in KTaO<sub>3</sub> Photocatalysts Reviewed

    Hanggara Sudrajat, Dikshya Dhakal, Mitsunori Kitta, Takuro Sasaki, Akiyo Ozawa, Sandhya Babel, Tomoko Yoshida, Nobuyuki Ichikuni, Hiroshi Onishi

    The Journal of Physical Chemistry C   Vol. 123 ( 30 ) page: 18387 - 18397   2019.8

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    DOI: 10.1021/acs.jpcc.9b03640

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  37. Selective Hydrogen Production from Formate Using Nanoparticle with Homogeneously Polymer-dispersed Platinum Clusters Reviewed

    Yusuke Minami, Yumiko Muroga, Tomoko Yoshida, Yutaka Amao

    Chemistry Letters   Vol. 48 ( 8 ) page: 775 - 778   2019.8

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    DOI: 10.1246/cl.190311

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  38. Photocatalytic decomposition of ethylene using He plasma induced nano-TiO<sub>2</sub> Reviewed

    Shin Kajita, Yudai Tomita, Eriko Yasunaga, Tomoko Yoshida, Kazuya Miyaguchi, Hirohiko Tanaka, Noriyasu Ohno

    Japanese Journal of Applied Physics   Vol. 58 ( 7 ) page: 070903 - 070903   2019.6

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    DOI: 10.7567/1347-4065/ab2830

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  39. Fabrication of a nanostructured TiO<sub>2</sub> photocatalyst using He plasma-irradiated tungsten and ethylene gas decomposition Reviewed

    Yudai Tomita, Shin Kajita, Eriko Yasunaga, Tomoko Yoshida, Noriyasu Ohno, Hirohiko Tanaka

    Japanese Journal of Applied Physics   Vol. 58 ( SE ) page: SEEG01 - SEEG01   2019.5

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    DOI: 10.7567/1347-4065/ab09c8

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  40. Chemical forms of molybdenum ion in nitric acid solution studied using liquid-phase X-ray absorption fine structure, Ultraviolet–Visible absorption spectroscopy and first-principles calculations Reviewed

    Shinta Watanabe, Toshikazu Sato, Masato Nakaya, Tomoko Yoshida, Jun Onoe

    Chemical Physics Letters   Vol. 723   page: 76 - 81   2019.5

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    DOI: 10.1016/j.cplett.2019.02.049

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  41. Photocatalytic Activity of Ga<sub>2</sub>O<sub>3</sub> Supported on Al<sub>2</sub>O<sub>3</sub> for Water Splitting and CO<sub>2</sub> Reduction Reviewed

    Ryota Ito, Masato Akatsuka, Akiyo Ozawa, Yuma Kato, Yu Kawaguchi, Muneaki Yamamoto, Tetsuo Tanabe, Tomoko Yoshida

    ACS Omega   Vol. 4 ( 3 ) page: 5451 - 5458   2019.3

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    DOI: 10.1021/acsomega.9b00048

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  42. Quantitative XAFS/EELS analyses of nitrogen species in titanium oxide photocatalysts Reviewed

    Tomoko Yoshida, Muenaki Yamamoto, Masato Akatsuka, Akiyo Ozawa, Yuma Kato, Shinya Yagi, Tetsuo Tanabe

    Surface and Interface Analysis   Vol. 51 ( 1 ) page: 46 - 50   2019.1

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    With a view to rational designing of a highly functional visible‐light TiO<sub>2</sub> photocatalyst, nitrogen atoms were doped into TiO<sub>2</sub> samples by an ion implantation technique which enables to control the depth and concentration of dopants. Although the absorbance in the visible‐light region of the sample increased by the nitrogen doping, photocatalytic activity of the sample was not directly connected with the photo‐absorbance. The N K‐edge X‐ray absorption near edge structure (XANES) spectrum of the photocatalytic active sample (A‐cat) showed a characteristic double peak at 398 and 401 eV, and the XANES spectrum of the inactive sample (I‐cat) a distinct single peak around 401 eV. These features of the XANES spectra were well reproduced by theoretical simulations based on the model where an O atom in TiO<sub>2</sub> was replaced by N ((N)s) for A‐cat, and that of quasi NO<sub>2</sub> molecule ((NO<sub>2</sub>)s) for I‐cat. Therefore, we have concluded that the nitrogen atom occupying the oxygen site of TiO<sub>2</sub> is photocatalytic active species effective for visible light photocatalysis. In addition, the quantitative XANES/ELNES analysis has revealed that the photo‐absorbance ratio of I‐cat to A‐cat corresponds well to the ratio of total doped nitrogen concentration rather than photocatalytic active nitrogen ((N)s) concentration. This result indicates that not only (N)s but also (NO<sub>2</sub>)s also absorb the visible light. Thus, the absorbance in the visible‐light region is not necessarily an indication of the visible‐light response of a photocatalyst.

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  43. Study on carbon dioxide reduction with water over metal oxide photocatalysts Reviewed

    Yuma Kato, Muneaki Yamamoto, Masato Akatsuka, Ryota Ito, Akiyo Ozawa, Yu Kawaguchi, Tetsuo Tanabe, Tomoko Yoshida

    Surface and Interface Analysis   Vol. 51 ( 1 ) page: 40 - 45   2019.1

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    Various metal oxides with 0.1 wt% Ag loaded as a cocatalyst were prepared by an impregnation method and examined their photocatalytic activity for CO<sub>2</sub> reduction with water. Among all the prepared Ag‐loaded metal oxides, Ga<sub>2</sub>O<sub>3</sub>, ZrO<sub>2</sub>, Y<sub>2</sub>O<sub>3</sub>, MgO, and La<sub>2</sub>O<sub>3</sub> showed activities for CO and H<sub>2</sub> productions under ultraviolet light irradiation. Thus, metal oxides involving metal cations with closed shell electronic structures such as d<sup>0</sup>, d<sup>10</sup>, and s<sup>0</sup> had the potential for CO<sub>2</sub> reduction with water. In situ Fourier transform infrared measurement revealed that the photocatalytic activity and selectivity for CO production are controlled by the amount and chemical states of CO<sub>2</sub> adsorbed on the catalyst surface and by the surface basicity, as summarized as follows: Ag/ZrO<sub>2</sub> enhanced H<sub>2</sub> production rather than CO production due to very little CO<sub>2</sub> adsorption. Ag/Ga<sub>2</sub>O<sub>3</sub> exhibited the highest activity for CO production, because adsorbed monodentate bicarbonate was effectively converted to bidentate formate being the reaction intermediates for CO production owing to its weak surface basicity. Ag/La<sub>2</sub>O<sub>3</sub>, Ag/Y<sub>2</sub>O<sub>3</sub>, and Ag/MgO having both weak and strong basic sites adsorbed larger amount of carbonate species including their ions and suppressed H<sub>2</sub> production. However, the adsorbed carbonate species were hardly converted to the bidentate formate.

    DOI: 10.1002/sia.6542

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  44. Control of nitrogen doping in NaTaO<sub>3</sub> synthesized by hydrothermal reaction and chemical state of nitrogen Reviewed

    Akiyo Ozawa, Keita Kobayashi, Tomoko Yoshida

    Surface and Interface Analysis   Vol. 51 ( 1 ) page: 89 - 94   2019.1

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    Nitrogen‐doped NaTaO<sub>3</sub> was synthesized through 1‐pot reaction, hydrothermal process using Ta<sub>3</sub>N<sub>5</sub> as precursor. Changing concentration and amount of NaOH aqueous solution influenced nitrogen content in NaTaO<sub>3</sub>. Absorption edge of nitrogen‐doped NaTaO<sub>3</sub> was extended at 570 nm, and absorbance in visible light region depended on nitrogen content in NaTaO<sub>3</sub>. Anodic photocurrent measured under visible light irradiation became larger with increasing nitrogen content in NaTaO<sub>3‐x</sub>N<sub>y</sub>. Under ultraviolet light irradiation (λ ≤ 400 nm), the highest anodic photocurrent was observed when nitrogen concentration was y = 0.024. It was possible to expand the wavelength range that can be effectively utilized for the photoelectrochemical reaction.

    DOI: 10.1002/sia.6556

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  45. Effects of the crystalline structure of Ga<sub>2</sub>O<sub>3</sub> on the photocatalytic activity for CO production from CO<sub>2</sub> Reviewed

    Yu Kawaguchi, Muneaki Yamamoto, Akiyo Ozawa, Yuma Kato, Tomoko Yoshida

    Surface and Interface Analysis   Vol. 51 ( 1 ) page: 79 - 84   2019.1

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    Ga<sub>2</sub>O<sub>3</sub> samples with different crystalline structures were prepared by calcination of a gallium nitrate powder around 800 K. Ga<sub>2</sub>O<sub>3</sub> samples with mixed phases of γ and β showed high photocatalytic activity for CO production from CO<sub>2</sub> reduction with water, and the activity was even higher than that for an Ag‐loaded β‐Ga<sub>2</sub>O<sub>3.</sub> The photocatalytic activity increased with time. The increase was attributed to the appearance of GaOOH resulting from the interaction of Ga<sub>2</sub>O<sub>3</sub> with water during the reaction as revealed by XRD and XPS analyses. In situ FT‐IR measurements revealed that bicarbonates and bidentate carbonate species were adsorbed on GaOOH. Therefore, the increase of the photocatalytic activity with time would be derived from the formation of GaOOH phase on the γ‐Ga<sub>2</sub>O<sub>3</sub> and β‐Ga<sub>2</sub>O<sub>3</sub> sample.

    DOI: 10.1002/sia.6552

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  46. One‐Step Plasma Synthesis of Nb<sub>2</sub>O<sub>5</sub> Nanofibers and their Enhanced Photocatalytic activity Reviewed

    Shin Kajita, Fumiaki Mimuro, Tomoko Yoshida, Noriyasu Ohno, Naoaki Yoshida

    ChemPhysChem   Vol. 19 ( 23 ) page: 3237 - 3246   2018.12

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    Abstract

    Fiberform nanostructured niobium (Nb) was fabricated by one step helium (He) plasma irradiation. He ion implantation formed He nano‐bubbles on a Nb plate and led to formation of protrusions while migrating in Nb matrix; fiberform nanostructures (FN) were grown when the fluence became high (&gt;10<sup>26</sup> m<sup>−2</sup>). The necessary conditions for the formation of Nb FN were revealed to be the surface temperature range of 900–1100 K and the incident ion energy higher than 70 eV. The sample was oxidized at 573–773 K in an air atmosphere, and Pt nanoparticles were photo‐deposited on the Nb<sub>2</sub>O<sub>5</sub> samples. The surface was analyzed by scanning electron microscope, transmission electron microscope, x‐ray photoelectron spectroscopy, and ultraviolet‐visible spectrophotometry. Photocatalytic activity of the fabricated materials was studied using methylene blue (MB) decolorization process. An enhanced photocatalytic performance was identified on FN Nb<sub>2</sub>O<sub>5</sub> substrate with Pt deposition.

    DOI: 10.1002/cphc.201800769

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  47. Analysis of Optical Properties and Structures of Nitrogen Doped Gallium Oxide

    Kato Yuma, Yamamoto Muneaki, Ozawa Akiyo, Kawaguchi Yu, Miyoshi Akinobu, Oshima Takayoshi, Maeda Kazuhiko, Yoshida Tomoko

    e-Journal of Surface Science and Nanotechnology   Vol. 16 ( 0 ) page: 262 - 266   2018.6

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    <p>To promote photocatalytic activity of gallium oxides (Ga<sub>2</sub>O<sub>3</sub>) on CO<sub>2</sub> reduction with water under visible light irradiation, we have tried nitrogen doping into Ga<sub>2</sub>O<sub>3</sub> with different crystalline structures. In diffuse reflectance UV-vis spectra, absorption bands appeared in the visible light region after the nitrogen doping and the absorption edge shifted to a longer wavelength region with increasing nitrogen doping temperature. N K-edge XANES analysis clearly showed two kinds of nitrogen species doped in the samples; gallium nitride (GaN) species and molecular like nitrogen. In XRD patterns, nitrogen doping at temperatures above 823 K, gallium nitride phases appeared while the original crystal structures of gallium oxide samples maintained when nitrogen doping temperature was less than 823 K. However, photocatalytic CO<sub>2</sub> reduction under visible light irradiation was insignificant for all the nitrogen doped samples, because nitrogen doped in Ga<sub>2</sub>O<sub>3</sub> samples was unstable in water under the visible light irradiation. [DOI: 10.1380/ejssnt.2018.262]</p>

    DOI: 10.1380/ejssnt.2018.262

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  48. Fabrication of photocatalytically active vanadium oxide nanostructures via plasma route Reviewed

    Shin Kajita, Tomoko Yoshida, Noriyasu Ohno, Yusuke Ichino, Naoaki Yoshida

    Journal of Physics D: Applied Physics   Vol. 51 ( 21 ) page: 215201 - 215201   2018.5

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    DOI: 10.1088/1361-6463/aabe44

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  49. Direct cross-coupling between alkenes and tetrahydrofuran with a platinum-loaded titanium oxide photocatalyst Reviewed

    Akanksha Tyagi, Akira Yamamoto, Muneaki Yamamoto, Tomoko Yoshida, Hisao Yoshida

    Catalysis Science and Technology   Vol. 8 ( 10 ) page: 2546 - 2556   2018.5

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    A Pt-loaded TiO2 photocatalyst successfully catalyzed the direct cross-coupling between various alkenes and tetrahydrofuran (THF) without any additional oxidizing agent. The reaction between cyclohexene and THF gave three cross-coupling products, namely, 2-cyclohexyltetrahydrofuran (A), 2-(cyclohex-2-en-1-yl)tetrahydrofuran (B) and 2-(cyclohex-1-en-1-yl)tetrahydrofuran (C), along with gaseous hydrogen. The mechanistic study revealed that these products were formed through different individual mechanisms: successive addition of two radical species, a 2-tetrahydrofuranyl radical and a hydrogen radical, to the double bond of cyclohexene for A, coupling of a 3-cyclohexenyl radical and a 2-tetrahydrofuranyl radical for B, and 2-tetrahydrofuranyl radical addition and hydrogen radical elimination at the double bond of cyclohexene for C. Among these three mechanisms, those for B and C are dehydrogenative. In this photocatalytic reaction system, since the cyclohexene molecule has enough reactivity, due to the localized π electron density, the Pt nanoparticles loaded on the TiO2 function not as a metal catalyst but as an electron receiver to enhance the charge separation, although the dehydrogenative cross-coupling of benzene with THF requires Pd metal catalysis.

    DOI: 10.1039/c8cy00129d

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  50. Preparation of gallium oxide photocatalysts and their silver loading effects on the carbon dioxide reduction with water Reviewed

    Yu Kawaguchi, Masato Akatsuka, Muneaki Yamamoto, Kokoro Yoshioka, Akiyo Ozawa, Yuma Kato, Tomoko Yoshida

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 358   page: 459 - 464   2018.5

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    DOI: 10.1016/j.jphotochem.2017.11.010

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  51. Sodium hexatitanate photocatalysts prepared by a flux method for reduction of carbon dioxide with water Reviewed

    Hisao Yoshida, Masumi Sato, Naoto Fukuo, Like Zhang, Tomoko Yoshida, Yuta Yamamoto, Takeshi Morikawa, Tsutomu Kajino, Mitsuru Sakano, Takeshi Sekito, Shinichi Matsumoto, Hirohito Hirata

    Catalysis Today   Vol. 303   page: 296 - 304   2018.4

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    DOI: 10.1016/j.cattod.2017.09.029

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  52. Synthesis of Ag nanoparticles prepared by a solution plasma method and application as a cocatalyst for photocatalytic reduction of carbon dioxide with water Reviewed

    Tomoko Yoshida, Naoto Yamamoto, Tsuyoshi Mizutani, Muneaki Yamamoto, Satoshi Ogawa, Shinya Yagi, Hirofumi Nameki, Hisao Yoshida

    Catalysis Today   Vol. 303   page: 320 - 326   2018.4

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    DOI: 10.1016/j.cattod.2017.08.047

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  53. Effect of Ag co-catalyst on CO2 adsorption states over Ga2O3 photocatalyst Reviewed

    Muneaki Yamamoto, Shinya Yagi, Tomoko Yoshida

    Catalysis Today   Vol. 303   page: 334 - 340   2018.4

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    DOI: 10.1016/j.cattod.2017.09.025

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  54. Spectroscopic and first-principles calculation studies of the chemical forms of palladium ion in nitric acid solution for development of disposal of high-level radioactive nuclear wastes Reviewed

    Shinta Watanabe, Toshikazu Sato, Tomoko Yoshida, Masato Nakaya, Masahito Yoshino, Takanori Nagasaki, Yusuke Inaba, Kenji Takeshita, Jun Onoe

    AIP Advances   Vol. 8 ( 4 )   2018.4

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    We have investigated the chemical forms of palladium (Pd) ion in nitric acid solution, using XAFS/UV-vis spectroscopic and first-principles methods in order to develop the disposal of high-level radioactive nuclear liquid wastes (HLLW: radioactive metal ions in 2 M nitric acid solution). The results of theoretical calculations and XAFS/UV-vis spectroscopy indicate that Pd is a divalent ion and forms a square-planar complex structure coordinated with four nitrate ions, [Pd(NO3)4]2-, in nitric acid solution. This complex structure is also thermodynamically predicted to be most stable among complexes [Pd(H2O)x(NO3)4-x]x-2 (x = 0-4). Since the overall feature of UV-vis spectra of the Pd complex was independent of nitric acid concentration in the range 1–6 M, the structure of the Pd complex remains unchanged in this range. Furthermore, we examined the influence of γ-ray radiation on the [Pd(NO3)4]2- complex, using UV-vis spectroscopy, and found that UV-vis spectra seemed not to be changed even after 1.0 MGy irradiation. This implies that the Pd complex structure will be still stable in actual HLLW. These findings obtained above are useful information to develop the vitrification processes for disposal of HLLW.

    DOI: 10.1063/1.5025778

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  55. Fuzzy nanostructure growth on precious metals by He plasma irradiation Reviewed

    Shin Kajita, Tomohiro Nojima, Yudai Tomita, Noriyasu Ohno, Hirohiko Tanaka, Naoaki Yoshida, Miyuki Yajima, Tsuyoshi Akiyama, Masayuki Tokitani, Takashi Yagi

    Surface and Coatings Technology   Vol. 340   page: 86 - 92   2018.4

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    DOI: 10.1016/j.surfcoat.2018.02.026

  56. Robust Binding between Carbon Nitride Nanosheets and a Binuclear Ruthenium(II) Complex Enabling Durable, Selective CO<sub>2</sub> Reduction under Visible Light in Aqueous Solution Reviewed

    Ryo Kuriki, Muneaki Yamamoto, Kimitaka Higuchi, Yuta Yamamoto, Masato Akatsuka, Daling Lu, Shinya Yagi, Tomoko Yoshida, Osamu Ishitani, Kazuhiko Maeda

    Angewandte Chemie International Edition   Vol. 56 ( 17 ) page: 4867 - 4871   2017.4

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    Abstract

    Carbon nitride nanosheets (NS‐C<sub>3</sub>N<sub>4</sub>) were found to undergo robust binding with a binuclear ruthenium(II) complex (RuRu′) even in basic aqueous solution. A hybrid material consisting of NS‐C<sub>3</sub>N<sub>4</sub> (further modified with nanoparticulate Ag) and RuRu′ promoted the photocatalytic reduction of CO<sub>2</sub> to formate in aqueous media, in conjunction with high selectivity (approximately 98 %) and a good turnover number (&gt;2000 with respect to the loaded Ru complex). These represent the highest values yet reported for a powder‐based photocatalytic system during CO<sub>2</sub> reduction under visible light in an aqueous environment. We also assessed the desorption of RuRu′ from the Ag/C<sub>3</sub>N<sub>4</sub> surface, a factor that can contribute to a loss of activity. It was determined that desorption is not induced by salt additives, pH changes, or photoirradiation, which partly explains the high photocatalytic performance of this material.

    DOI: 10.1002/anie.201701627

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  57. Enhancement of photocatalytic activity of TiO<sub>2</sub> by plasma irradiation Reviewed

    Shin Kajita, Tomoko Yoshida, Noriyasu Ohno, Tomoya Ishida, Daiki Kitaoka

    Japanese Journal of Applied Physics   Vol. 55 ( 10 ) page: 106202 - 106202   2016.10

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    In this study, plasma irradiations to titanium were conducted to enhance the photocatalytic activity of titanium oxide. When titanium is exposed to He plasmas, various morphology changes occur as forming nano-bubbles near the surface. Photocatalytic activity of the oxidized helium plasma irradiated titanium samples with nano-cones and microstructures were assessed by the hydrogen production from aqueous methanol solution. It is shown that the He plasma irradiation increases the photocatalytic activity more than double. Moreover, nitrogen mixture plasma irradiation to titanium (oxide) was conducted for doping nitrogen, which has been regarded as method to create visible light reactivity. It is shown from X-ray photoelectron spectroscopy (XPS) analysis that nitrogen doping has been successfully conducted under specific conditions.

    DOI: 10.7567/JJAP.55.106202

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    Other Link: http://stacks.iop.org/1347-4065/55/i=10/a=106202?key=crossref.69ed7b7971d62ec6f8c9129ecd2a2c59

  58. Fuzzy nanostructure growth on Ta/Fe by He plasma irradiation

    Kajita, S; Ishida, T; Ohno, N; Hwangbo, D; Yoshida, T

    SCIENTIFIC REPORTS   Vol. 6   page: 30380   2016.7

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    In this study, we show from helium (He) plasma irradiation to tantalum and iron surfaces that morphology changes in nanoscale occur on the both metals. In particular, from systematic irradiation experiments, it is identified that fuzzy nanostructures are grown on the both metals. The necessary conditions for the morphology changes are discussed based on the experimental results in terms of the helium migration, the physical sputtering, and the shear modulus of materials. Because oxides or oxinitrides of iron and tantalum are thought of as visible light responsive photocatalytic materials, the present work shows wide potential of usage of plasmas as a tool to tailor photocatalytic materials.

    DOI: 10.1038/srep30380

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  59. Ag K- and L3-edge XAFS study on Ag species in Ag/Ga2O3photocatalysts Reviewed

    M. Yamamoto , T. Yoshida , N. Yamamoto , T. Nomoto , A. Yamamoto , H. Yoshida , S. Yagi

    Journal of Physics: Conference Series   Vol. 712   page: 012074   2016.5

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    DOI: 10.1088/1742-6596/712/1/012074

  60. XAFS analysis for quantification of the gallium coordinations in Al<sub>2</sub>O<sub>3</sub>-supported Ga<sub>2</sub>O<sub>3</sub>photocatalysts Reviewed

    M. Akatsuka, T. Yoshida, N. Yamamoto, M. Yamamoto, S. Ogawa, S. Yagi

    Journal of Physics: Conference Series   Vol. 712   page: 012056 - 012056   2016.5

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    DOI: 10.1088/1742-6596/712/1/012056

    Other Link: http://stacks.iop.org/1742-6596/712/i=1/a=012056?key=crossref.49278627889fb72fe760993783b12a62

  61. Hydrogen Storage of Pd/Mg composite Nanoparticles Fabricated by Gas Evaporation Method

    Ogawa Satoshi, Suzuki Hiroyuki, Tsukada Chie, Yoshida Tomoko, Yagi Shinya

    e-Journal of Surface Science and Nanotechnology   Vol. 14 ( 0 ) page: 150 - 153   2016

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    Mg nanoparticles covered with the Pd nanoparticles (Pd/Mg NPs) have been fabricated by the gas evaporation method using He gas. The coaxial formation of the Mg and Pd NPs enables to fabricate the Pd/Mg NPs. The surfaces of the Pd and Mg NPs are quite clean because only pure He gas has been used during the fabrication of the NPs. The surface and interface chemical states of the Pd/Mg NPs have been investigated by X-ray photoelectron spectroscopy (XPS) without the exposure to the air. The XPS investigation has revealed that the formation of the interfacial alloy state between the Mg and Pd NPs. The Pd/Mg NPs can absorb the hydrogen at the room temperature by the hydrogenation of the most of the Mg atoms inside the Pd/Mg NPs. [DOI: 10.1380/ejssnt.2016.150]

    DOI: 10.1380/ejssnt.2016.150

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  62. Sulfur K-edge XANES for methylene blue in photocatalytic reaction over WO3 nanomaterials Reviewed

    K. Komori, T. Yoshida, T. Nomoto, M. Yamamoto, C. Tsukada, S. Yagi, M. Yajima, S. Kajita, N. Ohno

    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms   Vol. 365   page: 35 - 38   2015.12

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    DOI: 10.1016/j.nimb.2015.07.035

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  63. Characterization of nitrogen ion implanted TiO2 photocatalysts by XAFS and XPS Reviewed

    Tomoko Yoshida, Satoshi Niimi, Muneaki Yamamoto, Satoshi Ogawa, Toyokazu Nomoto, Shinya Yagi

    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms   Vol. 365   page: 79 - 81   2015.12

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    DOI: 10.1016/j.nimb.2015.04.010

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  64. Increase in the work function of W/WO<sub>3</sub>by helium plasma irradiation Reviewed

    Shin Kajita, Akio Ohta, Tomoya Ishida, Katsunori Makihara, Tomoko Yoshida, Noriyasu Ohno

    Japanese Journal of Applied Physics   Vol. 54 ( 12 ) page: 126201 - 126201   2015.12

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    DOI: 10.7567/JJAP.54.126201

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    Other Link: http://stacks.iop.org/1347-4065/54/i=12/a=126201?key=crossref.8de312670aa262f2ebe1e2556b349c69

  65. In situ UV–vis investigation of growth of gold nanoparticles prepared by solution plasma sputtering in NaCl solution Reviewed

    Tsuyoshi Mizutani, Satoshi Ogawa, Takaaki Murai, Hirofumi Nameki, Tomoko Yoshida, Shinya Yagi

    Applied Surface Science   Vol. 354   page: 397 - 400   2015.11

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    DOI: 10.1016/j.apsusc.2015.04.139

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  66. Effects of nitrogen-related defects on visible light photocatalytic response in N+ implanted TiO2: A first-principles study Reviewed

    Junya Senga, Kazuyoshi Tatsumi, Shunsuke Muto, Tomoko Yoshida

    Journal of Applied Physics   Vol. 118 ( 11 )   2015.9

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    It was found that the visible-light responsiveness of a nitrogen ion-implanted TiO2 photocatalyst was attributable to the predominant chemical states of nitrogen, depending on the local nitrogen concentration near the surface. In the present study, we examined the effects of conceivable nitrogen-related defects on the visible light responsiveness, based on electronic structures calculated from first principles. Possible chemical states were proposed by comparing previously reported experiments with the present theoretical N-K X-ray absorption spectra. The theoretically predicted visible light absorption spectra and carrier trap states due to the bandgap states associated with the defects well explained the relationship between the catalytic reactivity and the proposed chemical states.

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  67. Hydrogen storage property of materials composed of Mg nanoparticles and Ni nanoparticles fabricated by gas evaporation method Reviewed

    Taishi Fujimoto, Satoshi Ogawa, Tomomi Kanai, Naoki Uchiyama, Tomoko Yoshida, Shinya Yagi

    International Journal of Hydrogen Energy   Vol. 40 ( 35 ) page: 11890 - 11894   2015.9

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    DOI: 10.1016/j.ijhydene.2015.05.031

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  68. Hydrogen storage of binary nanoparticles composed of Mg and Pd Reviewed

    Satoshi Ogawa, Taishi Fujimoto, Tsuyoshi Mizutani, Masahiro Ogawa, Naoki Uchiyama, Kazuo Kato, Toshiaki Ohta, Tomoko Yoshida, Shinya Yagi

    International Journal of Hydrogen Energy   Vol. 40 ( 35 ) page: 11895 - 11901   2015.9

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    DOI: 10.1016/j.ijhydene.2015.04.087

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  69. The loading effect of silver nanoparticles prepared by impregnation and solution plasma methods on the photocatalysis of Ga 2 O 3 Reviewed

    Muneaki Yamamoto, Tomoko Yoshida, Naoto Yamamoto, Toyokazu Nomoto, Shinya Yagi

    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms   Vol. 359   page: 64 - 68   2015.9

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    DOI: 10.1016/j.nimb.2015.07.031

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  70. Effective nitrogen doping into TiO2 (N-TiO2) for visible light response photocatalysis Reviewed

    Tomoko Yoshida, Satoshi Niimi, Muneaki Yamamoto, Toyokazu Nomoto, Shinya Yagi

    Journal of Colloid and Interface Science   Vol. 447   page: 278 - 281   2015.6

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

    DOI: 10.1016/j.jcis.2014.12.097

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  71. Spectroscopic and morphological studies on interaction between gold nanoparticle and liposome constructed with phosphatidylcholine Reviewed

    C Tsukada, T Tsuji, K Matsuo, T Nomoto, G Kutluk, M Sawada, S Ogawa, T Yoshida, S Yagi

    IOP Conference Series: Materials Science and Engineering   Vol. 76   page: 012001 - 012001   2015.3

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    DOI: 10.1088/1757-899x/76/1/012001

    Other Link: http://stacks.iop.org/1757-899X/76/i=1/a=012001?key=crossref.7841256626afcf78ba29911c124eb567

  72. Hydrogen Storage Property of the Pd Nanoparticle with Clean Surfaces Studied by QCM

    Ogawa Satoshi, Fujimoto Taishi, Kanai Tomomi, Uchiyama Naoki, Tsukada Chie, Yoshida Tomoko, Yagi Shinya

    e-Journal of Surface Science and Nanotechnology   Vol. 13 ( 0 ) page: 343 - 346   2015

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    The hydrogen absorption behavior of the Pd NPs has been investigated by the noble techniques. The Pd NPs with the clean surface have been fabricated by the gas evaporation method. The P-C isotherm of the hydrogen absorption of the Pd NPs has been obtained using the QCM without the exposure to the air. The P-C isotherms have shown the clear size dependent absorption behavior for the Pd NPs. Further absorption and desorption cycles decrease the solubility of H signicantly in the Pd NPs. [DOI: 10.1380/ejssnt.2015.343]

    DOI: 10.1380/ejssnt.2015.343

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  73. Hydrogen storage property of materials composed of Mg nanoparticles and Ni nanoparticles fabricated by gas evaporation method Reviewed

    吉田 朋子

    International Journal of Hydrogen Energy   Vol. 40   page: 11890 - 11894   2015

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  74. Hydrogen storage of binary nanoparticles composed of Mg and Pd Reviewed

    吉田 朋子

    International Journal of Hydrogen Energy   Vol. 40   page: 11895 - 11901   2015

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  75. Photocatalytic reduction of CO<sub>2</sub> with water promoted by Ag clusters in Ag/Ga<sub>2</sub>O<sub>3</sub> photocatalysts Reviewed

    Muneaki Yamamoto, Tomoko Yoshida, Naoto Yamamoto, Toyokazu Nomoto, Yuta Yamamoto, Shinya Yagi, Hisao Yoshida

    Journal of Materials Chemistry A   Vol. 3 ( 32 ) page: 16810 - 16816   2015

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    <p>The structure and function of the Ag cocatalyst in Ag loaded Ga<sub>2</sub>O<sub>3</sub> photocatalysts for photocatalytic CO<sub>2</sub> reduction with water were investigated. It was found that around 1 nm sized Ag clusters had strong interactions with the Ga<sub>2</sub>O<sub>3</sub> surface and promoted the formation of bidentate formate species as the reaction intermediate for the CO production.</p>

    DOI: 10.1039/c5ta04815j

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  76. Depth distribution of dopant effective for visible‐light response in nitrogen‐doped TiO<sub>2</sub> photocatalyst Reviewed

    Tomoko Yoshida, Eriko Kuda, Shunsuke Muto

    Surface and Interface Analysis   Vol. 46 ( 12-13 ) page: 1236 - 1239   2014.12

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    Nitrogen was doped into TiO<sub>2</sub> by an ion implantation technique to investigate the depth distribution of nitrogen most effective for fabricating a visible‐light responsive photocatalyst. In the nitrogen‐doped TiO<sub>2</sub> samples, the photocatalytic activity under visible‐light irradiation was enhanced, wherein two types of chemical state of nitrogen, one photocatalytically active and the other inactive, were found depending on the nitrogen concentration, using electron energy loss spectroscopy. The depth distributions of nitrogen were quantified, so that the implanted nitrogen increased with thickness from the surface up to 90 nm, consistent with Monte Carlo simulations. The critical nitrogen concentration for the photocatalytically active species to form was estimated to be no higher than 1.8 atom%. We also derived semi‐empirical equations from the present results to estimate the critical depth of nitrogen distribution effectively reactive to be 13 ± 5 nm from the surface. Copyright © 2014 John Wiley &amp; Sons, Ltd.

    DOI: 10.1002/sia.5542

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  77. Hydrogen storage property of Ni nanoparticles fabricated by the gas evaporation method Reviewed

    Taishi Fujimoto, Satoshi Ogawa, Tomoko Yoshida, Naoki Uchiyama, Shinya Yagi

    Surface and Interface Analysis   Vol. 46 ( 12-13 ) page: 1121 - 1124   2014.12

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    We have fabricated the Ni nanoparticles with a clean surface by the gas evaporation method and clarified the hydrogen storage property by using atomic force microscope (AFM), X‐ray photoelectron spectroscopy (XPS) and quartz crystal microbalance (QCM) measurements. The diameter has been estimated as 4.0 ± 1.5 nm by AFM observation. The Ni nanoparticles possess a clean surface, because the surface chemical state has been confirmed as mainly metallic state by XPS. The hydrogen storage property has been investigated by QCM from the vacuum to the atmospheric pressure of the hydrogen at 300 K. The plateau pressure of the Ni nanoparticles and a maximum hydrogen storage capacity are about 7 Torr and H/Ni = 0.56, respectively. And the hydrogen release from the Ni nanoparticles has not been observed by QCM. The hydrogen adsorption/desorption reaction have also been observed as the plateau like pressure by QCM. These results indicate that (i) the plateau pressure of Ni is decreased by the nanosizing of the material, (ii) the large specific surface area of the Ni nanoparticles makes it possible to observe the adsorption/desorption reaction and (iii) the Ni hydride is stable under the vacuum condition. The chemical shift of Ni 2p<sub>3/2</sub> has not been observed in the XPS spectrum between before and after exposure to the hydrogen. This result implies that there is no strong chemical bonding between Ni and hydrogen or the hydrogen in the lateral surface has been released. Copyright © 2014 John Wiley &amp; Sons, Ltd.

    DOI: 10.1002/sia.5566

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  78. Preparation of gold nanoparticles included in anatase‐phase titania by solution plasma method Reviewed

    Tsuyoshi Mizutani, Takaaki Murai, Toyokazu Nomoto, Hirofumi Nameki, Tomoko Yoshida, Shinya Yagi

    Surface and Interface Analysis   Vol. 46 ( 12-13 ) page: 1125 - 1128   2014.12

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    The gold nanoparticles on titania support (AuNP/TiO<sub>2</sub>) has been paid attention as a catalyst and a photocatalyst. We perform the preparation of AuNP/TiO<sub>2</sub>, which is the combination of the sol–gel method and solution plasma method. In this method, we generate the plasma in the gelatinous peroxotitanic acid solution by the discharge between the gold electrodes, and then we synthesize the peroxotitanium gel containing gold nanoparticles. After drying and calcination process, we obtain the AuNP/TiO<sub>2</sub> samples. The X‐ray diffraction results show that the AuNP/TiO<sub>2</sub> is constituted by the nanocrystalline gold and anatase‐phase TiO<sub>2</sub>, and the lattice constant decreases by the embedded gold nanoparticles in the TiO<sub>2</sub> matrix. Ultraviolet–Visible absorption spectroscopy shows that the AuNP/TiO<sub>2</sub> samples absorb the visible light at about 630 nm based on the localized surface plasmon resonance of gold nanoparticles embedded in the TiO<sub>2</sub> matrix. The surface chemical states of the AuNP/TiO<sub>2</sub> samples are analyzed by the X‐ray photoelectron spectroscopy. The surface of AuNP/TiO<sub>2</sub> is composed with the majority of oxidized gold and minority of metallic gold which interacted with the TiO<sub>2</sub> surface. The Au L<sub>3</sub>‐edge near edge X‐ray absorption fine structure spectra indicate that the gold nanoparticles embedded in TiO<sub>2</sub> have metallic chemical states. We successfully prepare the gold nanoparticles on the surface and in the matrix of anatase‐phase TiO<sub>2</sub>. Copyright © 2014 John Wiley &amp; Sons, Ltd.

    DOI: 10.1002/sia.5567

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  79. XAFS and XPS study of hydro‐/dehydrogenation reaction of Mg–Pd nanoparticles Reviewed

    Satoshi Ogawa, Taishi Fujimoto, Tsuyoshi Mizutani, Masahiro Ogawa, Chihiro Yogi, Kazuo Kato, Toshiaki Ohta, Tomoko Yoshida, Shinya Yagi

    Surface and Interface Analysis   Vol. 46 ( 12-13 ) page: 1143 - 1146   2014.12

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    The nanoparticles composed of Mg and Pd atoms (Mg–Pd NPs) have been fabricated by the gas evaporation method, and the variation of the chemical state during hydro‐/dehydrogenations has been investigated by X‐ray photoelectron spectroscopy (XPS) and in‐situ X‐ray absorption fine structure (XAFS) analyses. Both XPS and XAFS spectra have indicated that the Mg–Pd NPs contain the chemical state of the metallic Pd and Mg–Pd alloy phases. The Mg–Pd alloy phase has been identified as MgPd and Mg<sub>6</sub>Pd by the Pd K‐edge EXAFS analysis. The hydrogen release of the Mg–Pd NPs has not been observed after first hydrogenation due to the migration of Mg toward the surface of the Mg–Pd NPs during the hydrogen storage. This irreversible migration has led the inhibition of the hydrogen diffusion into the surface from the inside of the Mg–Pd NPs. Copyright © 2014 John Wiley &amp; Sons, Ltd.

    DOI: 10.1002/sia.5647

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  80. In situ ultraviolet–visible absorbance measurement during and after solution plasma sputtering for preparation of colloidal gold nanoparticles Reviewed

    Tsuyoshi Mizutani, Takaaki Murai, Hirofumi Nameki, Tomoko Yoshida, Shinya Yagi

    Japanese Journal of Applied Physics   Vol. 53 ( 11 ) page: 11RA03 - 11RA03   2014.11

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    DOI: 10.7567/JJAP.53.11RA03

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    Other Link: http://stacks.iop.org/1347-4065/53/i=11S/a=11RA03?key=crossref.abf0db48a09f1feadf9e0e6809c9acc1

  81. Surface modification of titanium using He plasma Reviewed

    Shin Kajita, Daiki Kitaoka, Noriyasu Ohno, Reiko Yoshihara, Naoaki Yoshida, Tomoko Yoshida

    Applied Surface Science   Vol. 303   page: 438 - 445   2014.6

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    DOI: 10.1016/j.apsusc.2014.03.022

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  82. 29pAE-4 Photocatalysis of nanostructured tungsten materials irradiated by He plasma(29pAE Cross-disciplinary study of metallic surface nanostructures induced by the helium plasma irradiation)

    Yoshida Tomoko, Komori Katsuyuki, Yagi Shinya, Yajima Miyuki, Kitaoka Daiki, Kajita Shin, Ohno Noriyasu

    Meeting Abstracts of the Physical Society of Japan   Vol. 69.1.2 ( 0 ) page: 270   2014

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    DOI: 10.11316/jpsgaiyo.69.1.2.0_270_1

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  83. Application of Nanostructured Tungsten Fabricated by Helium Plasma Irradiation for Photoinduced Decolorization of Methylene Blue

    Komori Katsuyuki, Yoshida Tomoko, Yagi Shinya, Yoshida Hisao, Yajima Miyuki, Kajita Shin, Ohno Noriyasu

    e-Journal of Surface Science and Nanotechnology   Vol. 12 ( 0 ) page: 343 - 348   2014

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    The dendritic nanostructure was fabricated on a surface of tungsten plate by helium plasma irradiation. The nanostructure consisting of W metal was partially oxidized to form WO<sub>3</sub> on exposure to air, and the resulting surface exhibited a broad photoabsorption in the range from 1 to 5 eV. We examined photoinduced reaction of methylene blue (MB) on the material. It was found that the partially and fully oxidized surface nanostructures were able to promote a decolorization of MB under photoirradiation even with the near-infrared light (< 1:55 eV), whose energy is lower than the band gap of WO<sub>3</sub>. The reaction rate was varied with the fraction of W and WO<sub>3</sub> on the surface layers, that is, the partially oxidized sample promoted the reaction at a higher rate than the fully oxidized one. It is also found that the reaction rate decreased with time, which would be caused by the products accumulation on the surface and the surface oxidation. [DOI: 10.1380/ejssnt.2014.343]

    DOI: 10.1380/ejssnt.2014.343

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  84. In-Situ FT-IR Study on the Mechanism of CO<sub>2 </sub>Reduction with Water over Metal (Ag or Au) Loaded Ga<sub>2</sub>O<sub>3 </sub>Photocatalysts

    Yamamoto Muneaki, Yoshida Tomoko, Yamamoto Naoto, Yoshida Hisao, Yagi Shinya

    e-Journal of Surface Science and Nanotechnology   Vol. 12 ( 0 ) page: 299 - 303   2014

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    Ag loaded Ga<sub>2</sub>O<sub>3</sub> (Ag/Ga<sub>2</sub>O<sub>3</sub>) has exhibited photocatalytic activity for CO<sub>2</sub> reduction with water to produce CO as well as for water splitting to H<sub>2</sub> and O<sub>2</sub>. In-situ FT-IR measurements have shown CO<sub>3</sub> stretching vibration bands assignable to carbonate and bicarbonate species when CO<sub>2</sub> molecules chemisorbed on the catalyst surface. These species change to bidentate formate species under photoirradiation. It subsequently converts to CO by interacting with water molecules, not chemisorbed OH on the catalyst surface. This result suggests that formate species is an intermediate of the photocatalytic CO<sub>2</sub> reduction. On the other hand, Au loaded Ga<sub>2</sub>O<sub>3</sub> (Au/Ga<sub>2</sub>O<sub>3</sub>) has produced H<sub>2</sub> predominantly with a very small amount of CO formation, since the less amount of CO<sub>2</sub> molecules chemisorb on Au/Ga<sub>2</sub>O<sub>3</sub>. FT-IR measurements of the Ag/Ga<sub>2</sub>O<sub>3</sub> with high Ag loading have shown carbonate species due to the adsorption of atmospheric CO<sub>2</sub> on hydroxyl group. The carbonate species is too unstable under photoirradiation to convert into formate species, but is stabilized as CO<sub>3</sub><sup>2-</sup> species by the reaction with water. XANES analysis has revealed that atomically dispersed Ag metal species may be effective for the adsorption of CO<sub>2</sub> and the subsequent conversion into formate species to promote the photocatalytic CO<sub>2</sub> reduction. [DOI: 10.1380/ejssnt.2014.299]

    DOI: 10.1380/ejssnt.2014.299

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  85. Hydrogen storage property of Mg-Pd nanoparticles studied by spectroscopic techniques

    Ogawa S., Fujimoto T., Mizutani T., Ogawa M., Uchiyama N., Kato K., Ohta T., Yoshida T., Yagia S.

    20th World Hydrogen Energy Conference, WHEC 2014   Vol. 2   page: 1077 - 1082   2014

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    The hydrogen storage property of the nanoparticles composed of the Mg and Pd atoms (Mg-Pd NPs) has been investigated by QCM technique without the exposure to the air. We have also studied the chemical state of the Mg-Pd NPs by XPS and XAFS. The Mg-Pd NPs can store the hydrogen under the room temperature and 1 atm of H2 gas. However, the release of the hydrogen has not been observed. XAFS study has revealed that the irreversible change of the Mg-Pd NPs has caused the inhibition of the release of hydrogen.

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  86. Hydrogen storage property of materials composed of Mg nanoparticles and Ni nanoparticles fabricated by gas evaporation method

    Fujimoto T., Ogawa S., Yoshida T., Yagi S.

    20th World Hydrogen Energy Conference, WHEC 2014   Vol. 2   page: 1072 - 1076   2014

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    We have fabricated the materials composed of the Mg and the Ni nanoparticles and clarified the hydrogen storage property by using TEM, XPS and QCM. The Mg and the Ni nanoparticles have been fabricated by the gas evaporation method and been mixed. The diameters of the Mg and the Ni nanoparticles have been estimated as 20.0±8.4 and 4.7±2.0 nm, respectively. The XPS results show that the Mg and the Ni nanoparticles as prepared sample possess almost clean surface. However, this materials has not been hydrogenated under hydrogen atmospheric pressure at 303 K. The QCM results indicate that the hydrogen storage ability of this materials has been lost by the adsorption of residual gases even under vacuum condition in several hours after the end of fabrication. The XPS results after hydrogen exposure show that due to the Mg oxide shell on the surface of the Mg nanoparticles is formed by the residual gases, the hydrogenation of the Mg nanoparticles are hindered.

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  87. Hydrogen storage of binary nanoparticles composed of Mg and Pd

    Ogawa S., Fujimoto T., Mizutani T., Ogawa M., Uchiyama N., Kato K., Ohta T., Yoshida T., Yagia S.

    20th World Hydrogen Energy Conference, WHEC 2014   Vol. 2   page: 1083 - 1089   2014

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    The hydrogen storage property of the binary nanoparticles composed of Mg and Pd has been investigated by QCM technique without the exposure to the air. The two types of nanoparticles have been fabricated by the gas evaporation method with He gas. The one is the nanoparticles composed of the both Mg and Pd atoms (Mg-Pd NPs) and the other one is the composite of the each Mg and Pd nanoparticles (Mg NPs-Pd NPs). We have also studied the chemical state of the nanoparticles by XPS and XAFS. Both the Mg-Pd NPs and the Mg NPs-Pd NPs can store the hydrogen under the room temperature and 1 atm of H2 gas. However, the releases of the hydrogen have not been observed about the both samples. XAFS study has revealed that the irreversible change of the Mg-Pd NPs has caused the inhibition of the release of hydrogen. On the other hand, it seems that the Mg NPs-Pd NPs cannot release the hydrogen due to the stability of the MgH2 or the low hydrogen diffusion property inside of the MgH2.

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  88. Study on interaction between phosphatidylcholine(PC) liposome and gold nanoparticles by TEM observation

    Tsukada C., Tsuji T., Matsuo K., Nameki H., Yoshida T., Yagi S.

    Journal of Surface Analysis   Vol. 20 ( 3 ) page: 230 - 233   2014

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    <p>  The PC liposomes constructed with one lipid bilayer have been fabricated without using chloroform solution and phosphate-buffer saline. After reaction promotion, the Au NPs covered with PC molecules exist on the outside of the liposome membrane. The thickness of the liposome membrane is estimated to be approximately 5 nm.</p>

    DOI: 10.1384/jsa.20.230

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  89. The Influence of the Preparing Method of a Ag/Ga<sub>2</sub>O<sub>3 </sub>Catalyst on its Activity for Photocatalytic Reduction of CO<sub>2 </sub>with Water

    Yamamoto Naoto, Yoshida Tomoko, Yagi Shinya, Like Zhang, Mizutani Tsuyoshi, Ogawa Satoshi, Nameki Hirofumi, Yoshida Hisao

    e-Journal of Surface Science and Nanotechnology   Vol. 12 ( 0 ) page: 263 - 268   2014

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    We have prepared silver-loaded gallium oxide (Ag/Ga<sub>2</sub>O<sub>3</sub>) photocatalysts by the solution plasma method (SPM) and impregnation method (imp), and investigate the effects of the chemical states and the size of the Ag nanoparticles on their photocatalytic activities. The photocatalytic reduction of CO<sub>2</sub> with water proceeds over all the Ag/Ga<sub>2</sub>O<sub>3</sub> photocatalysts to produce CO, however the CO production rates decrease during photocatalytic reaction. Measurements of UV-VIS diffuse reflectance spectra, XANES spectra and TEM images reveal the followings:the Ag oxide nanoparticles in the as-prepared Ag/Ga<sub>2</sub>O<sub>3</sub> (imp) samples exist and their size distribution is wide from 5 to 10 nm. They become a lot of metallic nanoparticles by UV light-irradiation, and become larger particles with the size of ca. 20 nm during the photocatalytic reaction. On the other hand, the Ag nanoparticles in the as-prepared Ag/Ga<sub>2</sub>O<sub>3</sub> (SPM) samples are metallic with the size of less than 10 nm. The size does not change under UV light irradiation, while become larger particles during the photocatalytic reaction as similar to the case of the Ag/Ga<sub>2</sub>O<sub>3</sub> (imp) samples. Such small metallic Ag nanoparticles with the size of 5-10 nm are suitable for CO production. However, they aggregate during the reaction for 5 h to degrade the photocatalytic activity. [DOI: 10.1380/ejssnt.2014.263]

    DOI: 10.1380/ejssnt.2014.263

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  90. Helium plasma implantation on metals: Nanostructure formation and visible-light photocatalytic response Reviewed

    Shin Kajita, Tomoko Yoshida, Daiki Kitaoka, Reo Etoh, Miyuki Yajima, Noriyasu Ohno, Hisao Yoshida, Naoaki Yoshida, Yoshitaka Terao

    JOURNAL OF APPLIED PHYSICS   Vol. 113 ( 13 ) page: 134301 - 134307   2013.4

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    It has been found recently that low-energy helium (He) plasma irradiation to tungsten (W) leads to the growth of W nanostructures on the surface. The process to grow the nanostructure is identified as a self-growth process of He bubbles and has a potential to open up a new plasma processing method. Here, we show that the metallic nanostructure formation process by the exposure to He plasma can occur in various metals such as, titanium, nickel, iron, and so on. When the irradiation conditions alter, the metallic cone arrays including nanobubbles inside are formed on the surface. Different from W cases, other processes than growth of fiberform structure, i.e., physical sputtering and the growth of large He bubbles, can be dominant on other metals during irradiation; various surface morphology changes can occur. The nanostructured W, part of which was oxidized, has revealed a significant photocatalytic activity under visible light (wavelength &gt; 700 nm) in decolorization of methylene blue without any co-catalyst. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4798597]

    DOI: 10.1063/1.4798597

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  91. Heterogeneous palladium catalyst hybridised with titanium dioxide photocatalyst for direct C-C bond formation between aromatic ring and acetonitrile Reviewed

    H. Yoshida, Y. Fujimura, H. Yuzawa, J. Kumagai, T. Yoshida

    Chem. Commun.   Vol. 49   page: 3793-3795   2013

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  92. Helium Plasma Implantation on Metals: Nanostructure Formation and Visible-light Photocatalytic Response Reviewed

    S. Kajita, T. Yoshida, D. Kitaoka, R. Etoh, M. Yashima, N. Ohno, H. Yoshida, Na. Yoshida, Y. Terao

    J. Appl. Phys.   Vol. 113   page: 134301-134307   2013

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  93. Bifunctional Rhodium Cocatalysts for Photocatalytic Steam Reforming of Methane over Alkaline Titanate Reviewed

    Katsuya Shimura, Hiromasa Kawai, Tomoko Yoshida, Hisao Yoshida

    ACS CATALYSIS   Vol. 2 ( 10 ) page: 2126 - 2134   2012.10

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    Photocatalytic steam reforming of methane (PSRM; 2 H2O (g) + CH4 -&gt; 4 H-2 + CO2) was examined over metal-loaded K2Ti6O13 photocatalysts. Although the production rate was improved by loading Pt cocatalyst on the K2Ti6O13 photocatalyst, unfavorable formation of CO and gradual deactivation of photocatalyst were observed. On the other hand, a Rh-loaded K2Ti6O13 sample showed two times higher activity than the Pt-loaded one did, and promoted the PSRM selectively without deactivation for many hours. In the highly active Rh-loaded photocatalyst, the Rh cocatalyst existed as a mixture of small metallic rhodium and large rhodium oxide particles. The photocatalytic activity tests for hydrogen evolution and oxygen evolution from each aqueous solution of sacrificial reagent (methanol and silver nitrate, respectively) revealed that the metallic rhodium particles and the rhodium oxide particles could function as cocatalysts preferably for reduction and oxidation, respectively. Also on a Na2Ti6O13 photocatalyst, a mixture of rhodium metal and oxide similarly enhanced the photocatalytic activity. Thus, it is suggested that the Rh cocatalyst on these alkaline titanates bifunctionally promoted the PSRM.

    DOI: 10.1021/cs2006229

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  94. Gold nanoparticles on titanium oxide effective for photocatalytic hydrogen formation under visible light Reviewed

    Hayato Yuzawa, Tornoko Yoshida, Hisao Yoshida

    APPLIED CATALYSIS B-ENVIRONMENTAL   Vol. 115   page: 294 - 302   2012.4

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    Photocatalytic hydrogen production from aqueous ethanol was investigated over Au-loaded titanium oxide under visible light (510-740 nm) irradiation. Hydrogen was constantly produced through the present plasmonic photocatalysis. In this system. Au nanoparticles with larger particle size were essentially effective for the reaction due to the high efficiency for the localized surface plasmon resonance (LSPR). Further, Au nanoparticles with short rod-like shapes were more effective for the reaction than those with spherical shape because of the higher efficiency for the electron transfer from the Au nanopartide to the conduction band of titanium oxide. On the other hand, aggregates of the Au nanoparticles were not appropriate for the reaction, which derived from the low efficiency of the electron transfer. Finally, titanium oxide containing anatase phase with larger particle size was most preferred for the reaction. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.apcatb.2011.12.029

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  95. Gold nanoparticles on titanium oxide effective for photocatalytic hydrogen formation under visible light Reviewed

    H. Yuzawa, T. Yoshida and H. Yoshida

    Appl. Catal. B   Vol. 115-116   page: 294-302   2012

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  96. Bifunctional Rhodium Cocatalysts for Photocatalytic Steam Reforming of Methane over Alkaline Titanate Reviewed

    K. Shimura, H. Kawai, T. Yoshida, and H. Yoshida

    ACS Catal.   Vol. 2   page: 2126-2134   2012

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  97. Nontoxic, nonvolatile, and highly efficient osmium catalysts for asymmetric dihydroxylation of alkenes and application to one mol-scale synthesis of an anticancer drug, camptothecin intermediate Reviewed

    R. Akiyama, N. Matsuki, H. Nomura, H. Yoshida, T. Yoshida, S. Kobayashi

    RSC Adv.   Vol. 2   page: 7456-7461   2012

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  98. Cluster size analysis in Ge-doped silica showing 3.1 eV luminescence by RMC-XAFS and HAADF-STEM Reviewed

    T. Yoshida, S. Muto, H. Yoshida

    AMTC Letters   Vol. 3   page: 208-209   2012

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  99. Cluster size analysis in Ge-doped silica showing 3.1 eV luminescence by RMC-XAFS and HAADF-STEM Reviewed

    T. Yoshida, S. Muto, H. Yoshida

    AMTC Letters   Vol. 3   page: 208 - 209   2012

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  100. In-situ Mg K- and Pd L<inf>3</inf>-edges NEXAFS investigation of MG-PD nanoparticles

    Ogawa S., Mizutani T., Ogawa M., Yogi C., Ohta T., Yoshida T., Yagi S.

    NANOCON 2012 - Conference Proceedings, 4th International Conference     page: 274 - 279   2012

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    The chemical state around the Mg and Pd atoms in the Mg-Pd nanoparticles has been investigated by the Mg K- and Pd L3-edges NEXAFS techniques under in-situ condition. The Mg-Pd nanoparticles possess metallic Mg and Pd states and the surface of the Mg-Pd nanoparticles is partly oxidized. Moreover, both the Mg K- and Pd L3-edges NEXAFS spectra show that the Mg-Pd alloy phases are formed in the Mg-Pd nanoparticles. The variation of the chemical states around the Pd atom after the cycles of the exposure to the H2 gas has been also investigated by the Pd L3-edge NEXAFS technique. The Mg-Pd alloy phases dissociate by the cycles of hydrogenation and dehydrogenation.

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  101. Study on radiation damage for l-cysteine on au nanoparticle by soft x-ray

    Tsukada C., Mizutani T., Ogawa S., Nomoto T., Nameki H., Ueno T., Sawada M., Kutluk G., Namatame H., Taniguchi M., Yoshida T., Yagi S.

    NANOCON 2012 - Conference Proceedings, 4th International Conference     page: 648 - 653   2012

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    We have revealed the radiation damage for the cys/Au NPs/Ni sample by the X-ray irradiation at the energy regions of N and O K-edges NEXAFS. The Au NPs colloidal solution is fabricated by the solution plasma method, and the adsorption reaction between the Au NPs and L-cysteine is promoted under water environment. About the cys/Au NPs/Ni sample after the X-ray irradiation, the radiation damages appear at N and O K-edges NEXAFS, S2p XPS and N1s XPS spectra. It is found that the L-cysteine adsorbates desorb from the Au NPs surface. This desorption occurs by means of the electron bombardment of secondary electrons excited from the Au NPs surface.

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  102. STUDY ON RADIATION DAMAGE FOR L-CYSTEINE ON AU NANOPARTICLE BY SOFT X-RAY

    Tsukada, C; Mizutani, T; Ogawa, S; Nomoto, T; Nameki, H; Ueno, T; Sawada, M; Kutluk, G; Namatame, H; Taniguchi, M; Yoshida, T; Yagi, S

    NANOCON 2012, 4TH INTERNATIONAL CONFERENCE     page: 648 - 653   2012

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  103. IN-SITU MG K- AND PD L<sub>3</sub>-EDGES NEXAFS INVESTIGATION OF MG-PD NANOPARTICLES

    Ogawa, S; Mizutani, T; Ogawa, M; Yogi, C; Ohta, T; Yoshida, T; Yagi, S

    NANOCON 2012, 4TH INTERNATIONAL CONFERENCE     page: 274 - 279   2012

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  104. Simultaneously photodeposited rhodium metal and oxide nanoparticles promoting photocatalytic hydrogen production Reviewed

    K. Shimura, H. Kawai, T. Yoshida, H. Yoshida

    Chem. Commun.   Vol. 47   page: 8958-8960   2011

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  105. 放射光・電子分光法融合による触媒活性種の化学状態解析 Reviewed

    吉田朋子、武藤俊介

    触媒   Vol. 53   page: 228-234   2011

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  106. Photocatalytic Steam Reforming of Methane over Sodium Tantalate Reviewed

    K. Shimura, S. Kato, T. Yoshida, H. Itoh, T. Hattori and H. Yoshida

    J. Phys. Chem. C   Vol. 114   page: 3493-3503.   2010

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  107. Nitrogen doped TiO2 photocatalyst prepared by low energy N+ implantation technique Reviewed

    T. Yoshida and E. Kuda

    Stud. Surf. Sci. Catal.   Vol. 175   page: 267-270   2010

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  108. Photocatalytic Activation of Water and Methane over Modified Gallium Oxide for Hydrogen Production Reviewed

    K. Shimura, T. Yoshida and H. Yoshida

    J. Phys. Chem. C   Vol. 114   page: 11466-11474   2010

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  109. Synchrotron-radiation-stimulated etching of polydimethylsiloxane using XeF2 as a reaction gas Reviewed

    T-Y Chiang, T. Makimura, T. He, S. Torii, T. Yoshida, R. Tero, C. Wang and T. Urisu

    J. Synchrotron Rad.   Vol. 17   page: 69-74   2010

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  110. Clustering of germanium atoms in silica glass responsible for the 3.1 eV emission band studied by optical absorption and X-ray absorption fine structure analysis Reviewed

    T. Yoshida, S. Muto, L. Yuliati, H. Yoshida and Y. Inada

    J. Nucl. Mater.   Vol. 386-388   page: 1010-1013   2009

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  111. Diagnostic Nano-Analysis of Materials Properties by Multivariate Curve Resolution Applied to Spectrum Images by S/TEM-EELS Reviewed

    S. Muto, T. Yoshida and K. Tatsumi

    Mater. Trans.   Vol. 50   page: 964-969   2009

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  112. Formation of germanium nanoparticles in silica glass studied by optical absorption and X-ray absorption fine structure analysis Reviewed

    T. Yoshida, S. Muto, L. Yuliati, H. Yoshida and Y. Inada

    Nucl. Instr. and Meth. B   Vol. 267   page: 1368-1371   2009

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  113. 複合電子分光による機能元素分析と物性画像診断 Reviewed

    武藤俊介、吉田朋子、巽 一厳

    日本金属学会誌   Vol. 48   page: 290-293   2009

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  114. Hydrogen trapping state associated with the low-temperature TDS peak in hydrogenated nanostructured graphite Reviewed

    Y. Miyabe, T. Yoshida, S. Muto, T. Kiyobayashi and H. Wasada

    Journal of Applied Physics   Vol. 104   page: 044311   2008.7

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  115. X-ray excited 3.2-eV luminescence from amorphous silica: radiative electron relaxation through unidentified centre and its thermal switching Reviewed

    M. Ishii, T. Yoshida and K. Sakurai

    Journal of Physics: Condensed Matter   Vol. 20   page: 255249   2008.3

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  116. Local atomic and electronic structure around Mg and Al dopants in LiNiO2 electrodes studied by XANES and ELNES and first-principles calculations Reviewed

    K. Tatsumi, Y. Sasano, S. Muto, T. Yoshida, T. Sasaki, K. Horibuchi, Y. Takeuchi and Y. Ukyo

    Phys. Rev. B,   Vol. B78   page: 1-9   2008

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  117. *Chemical state analysis of implanted nitrogen in visible-light response TiO2 photo-catalyst Reviewed

    T. Yoshida and S. Muto

    Trans. Mater. Res. Soc. Japan   Vol. 33 ( 2 ) page: 339-344.   2008

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    It was found that nitrogen-doped TiO2 revealed significant improvement in high photocatalytic reactivity under visible-light [Asahi et al, Science 293, 269-271 (2001).] To investigate the optimal local concentration of doped nitrogen for visible-light response, N+-implanted TiO2 samples were examined by means of X-ray absorption near edge structure (XANES) and electron energy loss spectroscopy (EELS). Depth-resolved N K-edge in EELS revealed two types of chemical state of nitrogen, depending on the concentration, which was consistent with the XANES results. We found that the local nitrogen concentration effective for visible-light response was less than &#61566;1 at%. Further, we visualized the spatial distributions of the different chemical states of nitrogen by energy-filtering TEM (EFTEM). It was also found that the photocatalytic active state was offset by the coexisting photocatalytic inactive state.

  118. *Chemical state analysis of implanted nitrogen in visible-light response TiO2 photo-catalyst Reviewed

    T. Yoshida, S. Muto

    Trans. Mater. Res. Soc. Japan   Vol. 33 ( 2 ) page: 339-344.   2008

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  119. Hydrogen Quasi-Chemically Trapped Between Defective Graphene Layers in Nanostructured Graphite Reviewed

    Y. Miyabe, T. Yoshida, S, Muto and T. Kiyobayashi

    Mater. Sci. Forum   Vol. 561-565   page: 1585-1588   2007.5

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    Direct evidences of hydrogen loosely trapped between graphene layers in nanostructured graphite prepared by mechanical milling in a hydrogen atmosphere are presented, based on a combinational study of FT-IR, electron diffraction (ED) and electron energy-loss spectroscopy (EELS). The FT-IR spectrum of nanostructured graphite exhibited a new broad absorption band at very low frequencies around 660 cm-1, which almost disappeared by annealing up to 800 K. ED and plasmon peaks in EELS detected the unusual shrinkage and subsequent expansion of the fragmented graphene interlayer distance by hydrogen incorporation and desorption with annealing, well correlated with the change in intensity of the 660 cm-1 IR band. All the present results support our previous studies

  120. Depth selective electronic state analysis of implanted nitrogen in visible-light response TiO2 photocatalyst Reviewed

    T. Yoshida, S. Muto and J. Wakabayashi

    Mater. Sci. Forum   Vol. 561-565   page: 567-570   2007.5

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    Energetic nitrogen ion was injected into a TiO2 photocatalyst in order to investigate the optimal local concentration of doped nitrogen for visible-light response. N+-implanted TiO2 samples promoted the photocatalytic activity under visible-light irradiation. N K-edge XANES of the highest activity sample indicated that N replaces the O sites near the surface, whereas in the samples of higher N+ fluence, N-O and/or N-N species formed. Depth-resolved N K-edge ELNES revealed the two types of N, depending on the concentration, and we found the local N concentration effective for visible-light response was less than ~1 at%. Further, the spatial distributions of the different chemical states of N by energy-filtering TEM (FETEM) supported these findings.

  121. 位置選択的電子エネルギー損失分光法によるナノ表面・界面電子状態測定とその空間分布の可視化 Invited Reviewed

    武藤俊介,吉田朋子

    表面   Vol. 45   page: 1-12   2007

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  122. X-ray absorption near-edge structures of disordered Mg1-xZnxO solid solutions Reviewed

    T. Mizoguchi, A. Seko, M. Yoshida, H. Yoshida, T. Yoshida, W.Y. Ching and I. Tanaka

    Phys. Rev. B   Vol. 76   page: 195125   2007

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    In order to examine x-ray absorption near-edge structures (XANES) of disordered solid solutions of metal oxides, a combined approach of a first principles sipercell method and a cluster expansion method is developed. Zn-L3 edge XANES are measured on a series of Mg1-xZnxO with a rocksalt structure in the range of x = 0.025-0.3 using synchrotron source. A first principles orthogonalized linear combinations of an atomic orbital method is employed to obtain a theoretical spectrum of a given model. A Zn-2p core hole is included in the calculation, and a set of 128 atom supercells is used. Theoretical XANES of disordered solid solutions are obtained as a weighted sum of theoretical spectra for four ordered structures, with the weighting factors determined by the cluster expansion method. The dependence of the spectral shape on the solute concentration is reproduced only when the averaged environment of solute atoms as determined by the solute concentration solution is confirmed by the Monte Carlo calculations.

  123. Depth-Resolved EELS and Chemical State Mapping of N+-Implanted TiO2 Photocatalyst Reviewed

    Tomoko Yoshida, Shunsuke Muto, Jun Wakabayashi

    Mater. Trans.   Vol. 48   page: 2580-2584   2007

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    We propose novel methods of depth-resolved EELS (DREELS) and chemical state mapping, and the techniques were applied to the cross-sectional TEM (XTEM) sample of N+ implanted TiO2 catalyst. The methods successfully extracted the depth dependence of the N-K ELNES and the spatial distributions of the constituent chemical states separately.

  124. Detection of hydrogen at localized regions by unoccupied electronic states in iron carbides, towards high spatial resolution mapping of hydrogen distributions Reviewed

    K. Tatsumi, S. Muto and T. Yoshida

    J. Appl. Phys.   Vol. 101   page: 023523   2007

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  125. Measurement of soft X-ray excited optical luminescence of a silica glass Reviewed

    T. Yoshida, S. Muto and T.Tanabe

    AIP conf. Proc.   Vol. 882   page: 572-574   2007

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  126. Enhancement of gamma-ray radiolysis of carbon dioxide with the assistance of solid materials Reviewed

    D. Watanabe, T. Yoshida, C. Allen and T. Tanabe

    J. Radioanal. Nucl. Chem.   Vol. 272   page: 461-465   2007

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  127. Utilization of gamma-ray irradiation for hydrogen production from water Reviewed

    T.Yoshida, T.Tanabe, N.Sugie and A.Chen

    J. Radioanal. Nucl. Chem   Vol. 272   page: 471-476   2007

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  128. XANESによる触媒の状態解析(1) Invited Reviewed

    吉田朋子,田中庸裕,巽 一厳,田中 功

    触媒   Vol. 48   page: 44-50   2006

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  129. 放射線の有効利用―放射性廃棄物の有効利用を目指して Reviewed

    田辺哲朗,吉田朋子

    日本原子力学会誌   Vol. 48   page: 661-668   2006

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  130. XANESによる触媒の状態解析(2) Invited Reviewed

    巽 一厳,吉田朋子,田中 功, 田中庸裕

    触媒   Vol. 48   page: 264-270   2006

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  131. Temperature dependence of luminescence from a silica glass under in-reactor irradiation Reviewed

    S. Takahara, T. Yoshida, T. Tanabe, M. Okada, Q. Xu

    Nucl. Instr. and Meth. B   Vol. 250   page: 377-381   2006

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  132. Spectral restoration and energy resolution improvement of electron-loss spectra by Pixon reconstruction : II. Application to practical ELNES analysis of low SNR Reviewed

    S. Muto, K. Tatsumi, R. C. Puetter, T. Yoshida, Y. Yamamoto and Y. Sasano

    J. Electron Microsc   Vol. 55   page: 225-230   2006

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  133. Observation of defect formation process in silica glasses under ion irradiation Reviewed

    M. Watanabe, T Yoshida, T Tanabe, S Muto, A. Inoue, S. Nagata

    Nucl. Instr. and Meth. B   Vol. 250   page: 174-177   2006

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  134. Effects of secondary electrons emitted from surroundings on defect formation in silica glass under gamma ray irradiation Reviewed

    S. Obata, T.Yoshida, T.Tanabe, C.Allen, M.Okada, Q. Xu

    Nucl. Instr. and Meth. B   Vol. 250   page: 169-173   2006

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  135. Enhanced Gamma-ray Energy Conversion in Water Vessels Part II: Hydrogen Production by Water Radiolysis Reviewed

    T. Yoshida, T. Tanabe, T. Sawasaki and A.Y.K. Chen

    Nucl. Sci. and Eng.   Vol. 150   page: 357-361   2005

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    A technique has been proposed to increase the efficiency of hydrogen production from water by γ-ray radiolysis as an effective use of radioactive waste. This is possible by putting special metal structures into water to enhance the conversion of MeV range γ-ray to low-energy electrons which escape from metal into water. The experimental results showed that hydrogen production could be significantly enhanced by carefully controlling the thickness of metal components and the proximity with adjacent metal components.

  136. 高エネルギー放射線の化学反応への応用―γ線を利用した水からの水素製造 Invited Reviewed

    吉田朋子, 田辺哲朗, アレンチェン

    放射線化学   Vol. 79   page: 13-18   2005

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  137. An Attempt to Directly Convert Gamma-ray Energy into Electricity Reviewed

    T. Yoshida , A.Y.K. Chen, J. Nozawa, N. Sugie, and T. Tanabe

    Nucl. Sci. and Eng.   Vol. 150   page: 362-367   2005

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    This is a proposal attempting to convert g-ray energy into electric energy via differentiated secondary electron generation by g-ray interacting with two different metal components. In this preliminary study, the maximum generated electric current and power were respectively 0.58 mA and 0.093 mW.

  138. XAFS study on silica glasses irradiated by energy particles Reviewed

    T. Yoshida, T. Tanabe and H. Yoshida

    Phys. Scripta   Vol. T115   page: 435-438   2005

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    X-ray absorption technique was applied to analyze the local structures of fused and synthesized silica glasses before and after the irradiation in a nuclear reactor. Si K-edge EXAFS revealed changes in the SiO4 tetrahedron structure by the irradiation, i.e. a distorted tetrahedron in the silica glass returned to more regular one but the connection between neighboring tetrahedrons became looser.

  139. Decomposition of carbon dioxide by the aid of metals under gamma-ray irradiation Reviewed

    T. Yoshida, T. Tanabe, Y. Okabe, T. Sawasaki and A.Y.K. Chen

    Radiation Research   Vol. 164   page: 332-335   2005

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    We have proposed a technique to enhance the decomposition of carbon dioxide by gamma-ray irradiation. This is possible by putting metal components into carbon dioxide CO2 gas to promote the conversion of gamma-ray to lower-energy electrons through Compton, photoelectron, and cascading electron knock-on events in metals.

  140. Formation of Nanoarchitectures Including Subnanometer Palladium Clusters and Their Use as Highly Active Catalysts Reviewed

    K. Okamoto, R. Akiyama, H. Yoshida, T. Yoshida and S. Kobayashi

    J. Am. Chem. Soc.   Vol. 127   page: 2125-2135   2005

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  141. Enhanced Gamma-ray Energy Conversion in Water Vessels Part I: Physical Mechanisms Reviewed

    A.Y.K. Chen, T. Tanabe, T. Yoshida

    Nucl. Sci. and Eng.   Vol. 150   page: 349-356   2005

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  142. Measurement of luminescence from silica glasses : an optical X-ray absorption fine structures study at Si K-edge Reviewed

    T. Yoshida, T. Tanabe, S. Takahara and H. Yoshida

    Phys. Scripta   Vol. T115   page: 528-530   2005

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  143. Temperature dependence of luminescence from silica glasses under in-reactor and 60Co gamma-ray irradiation Reviewed

    S. Takahara, T. Yoshida, T. Tanabe, T. Ii, M. Hirano and M. Okada

    Nucl. Instr. and Meth. B   Vol. 218   page: 133-138   2004

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  144. In-Situ Optical Reflection Measurement of a Si(100) Surface under Hydrogen Ion Irradiation Reviewed

    T. Yoshida, M. Sakai and T. Tanabe

    Materials Transactions   Vol. 45 ( 7 ) page: 2018-2022   2004

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  145. Study of damaging process in silica by in-situ hyrogen-induced luminescence measurements Reviewed

    T. Yoshida, T. Tanabe, M. Watanabe, S. Takahara and S. Mizukami

    J. Nucl. Mater.   Vol. 329-333   page: 982-987   2004

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  146. FT-IR Study on the effect of OH content on the damage process in silica glasses irradiated by hydrogen Reviewed

    T. Yoshida, T. Tanabe, M. Hirano and S. Muto

    Nucl. Instr. and Meth. B   Vol. 218   page: 202-208   2004

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  147. 環境中に放出された人工化学物質の放射線による分解 Invited Reviewed

    吉田朋子, 田辺哲朗

    応用物理   Vol. 72   page: 471-472   2003

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  148. A New Method for the Degradation of Dibutyl Phthalate in Water by Gamma-ray Irradiation Reviewed

    T. Yoshida, T. Tanabe, A. Chen, Y. Miyashita, H. Yoshida, T. Hattori and T. Sawasaki

    Journal of Radioanalytical and Nuclear Chemistry   Vol. 255   page: 265-269   2003

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  149. Intermediate Valence State of La0.9Eu0.1Ni2(Si1-xGex)2 Compounds Reviewed

    H. Wada, A. Mitsuda, T. Yoshida, T. Yamamoto and T. Tanaka

    J. Phys. Soc. Jpn   Vol. 72 ( 10 ) page: 2604-2607   2003

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  150. The application of gamma radiolysis of water for H2 production Reviewed

    T. Sawasaki, T. Tanabe, T. Yoshida and R. Ishida

    Journal of Radioanalytical and Nuclear Chemistry   Vol. 255   page: 271-274   2003

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  151. In-situ Luminescence Measurement of Silica under Soft X-ray and Gamma-Ray Irradiation Reviewed

    T. Yoshida, T. Tanabe, T. Ii and H. Yoshida

    Nucl. Instr. and Meth. B   Vol. 191   page: 382-386   2002

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  152. Active sites on mesoporous and amorphous silica and their photocatalytic activity: Investigations by FTIR, ESR, VUV-UV-vis and photoluminescence spectroscopies Reviewed

    Y. Inaki, H. Yoshida, T. Yoshida, T. Hattori

    J. Phys. Chem. B   Vol. 106   page: 9098-9106   2002

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  153. In-situ luminescence and optical absorption measurements of silica in reactor core Reviewed

    T. Yoshida, T. Ii, T. Tanabe, H. Yoshida and K.Yamaguchi

    J. Nuclear materials   Vol. 307-311   page: 1268-1272   2002

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  154. XANES analyses of silicon crystalline irradiated by nitrogen / oxygen ions Reviewed

    T. Yoshida, T. Hara, T. Ii, H. Yoshida and T. Tanabe

    J. Synchrotron Rad.   Vol. 8   page: 755-757   2001

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  155. Degradation of Dibuty Phthalate in Water by the Aid of Metals under Gamma-ray Irradiation Reviewed

    T. Yoshida, T. Tanabe, Y. Miyashita, H. Yoshida and T. Hattori

    Chem. Lett.     page: 876-877   2001

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  156. X-ray absorption and VUV spectroscopic studies of silica glasses irradiated in a nuclear reactor Reviewed

    T. Yoshida, T. Tanabe, H. Yoshida and T. Ii

    J. Electron Spectroscopy and related phenomena   Vol. 119   page: 221-227   2001

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  157. Quantification of Aluminium Coordinations in Alumina and Silica-alumina by Al K-edge XANES Reviewed

    Y. Kato, K. Shimizu, N. Matsushita, T. Yoshida, H. Yoshida, A. Satsuma and T. Hattori

    Phys. Chem. Chem. Phys.   Vol. 3   page: 1925-1929   2001

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  158. Structural analysis of amorphous and glass by means of RMC-EXELFS

    Muto S., Yoshida T., Tanabe T.

    Meeting Abstracts of the Physical Society of Japan   Vol. 56.2.4 ( 0 ) page: 801   2001

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.56.2.4.0_801_3

    CiNii Research

  159. XAFS analysis of europium species supported on aluminium oxide surface Reviewed

    T. Yoshida, T. Tanaka, S. Yoshida, S. Hikita, T. Baba, T. Hinode and Y. Ono

    Applied surface science   Vol. 156   page: 65-75   2000

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  160. ガンマ線による環境ホルモンの分解、無害化 Reviewed

    吉田朋子、田辺哲朗、宮下祥則、吉田寿雄、服部 忠

    日本原子力学会誌(ショートノート)     page: 1082-1083   2000

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  161. Study on the damaging process of silica by in-reactor-luminescence Reviewed

    T. Ii, T. Yoshida, T. Tanabe, T. Hara, M. Okada and K. Yamaguchi

    J. Nuclear materials   Vol. 283-287   page: 898-902   2000

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  162. Hydrogen effect on the surface structure of Si(100) studied by in-situ Raman spectroscopy Reviewed

    T. Hara, T. Yoshida, M. Sakai and T. Tanabe

    Jpn. J. Appl. Phys.   Vol. 39   page: 4427-4431   2000

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  163. EXAFS Study of Yb species encapsulated in Potassium Y-type Zeolite Reviewed

    T. Yoshida, T. Tanaka, S. Yoshida, S. Hikita, T. Baba and Y. Ono

    Solid State Commun.   Vol. 114   page: 255-259   2000

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  164. In-reactor luminescence from silica glasses Reviewed

    T. Yoshida, T. Tanabe, T. Ii, T. Hara, M. Sakai and Y. Inaki

    Nucl. Instr. and Meth. B   Vol. 166-167   page: 476-482   2000

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  165. XAFS study on silica glasses irradiated in a nuclear reactor Reviewed

    T. Yoshida, H. Yoshida, T. Hara, T. Ii, T. Okada and T. Tanabe

    Nucl. Instr. and Meth. B   Vol. 166-167   page: 483-489   2000

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  166. XAFS study on D+ irradiated Si surface

    T. Yoshida, H. Yoshida, T. Hara, M. Sakai, A. Omori and T. Tanabe

    J. Synchrotron Rad.   Vol. 6   page: 734   1999

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  167. Mg-Al Mixed Oxides as Highly Active Acid-Base Catalysts for Cycloaddition of Carbon Dioxide to Epoxides

    K. Yamaguchi, K. Ebitani, T. Yoshida, H.Yoshida and K. Kaneda

    J. Am. Chem. Soc.   Vol. 121   page: 4526   1999

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  168. Application of XANES Spectra to Supported Catalysts Reviewed

    T. Tanaka, T. Yamamoto, Y. Kohno, T. Yoshida and S. Yoshida

    Jpn. J. Appl. Phys.   Vol. 38   page: 30-35   1999

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  169. Al K-edge XANES study for the quantification of aluminum coordinations in alumina Reviewed

    K. Shimizu, Y. Kato, T. Yoshida, H. Yoshida, A. Satsuma and T. Hattori

    Chem. Commun.     page: 1681-1682   1999

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  170. XANES and XPS Analyses of Silicon Irradiated by Deuterium Ions Reviewed

    T. Yoshida, T. Tanabe, H. Yoshida, Y. Yazawa, T. Hara, M. Sakai, H. Yamamoto and Y. Baba

    Jpn. J. Appl. Phys.   Vol. 38   page: 305-308   1999

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  171. XAFS Study on the Structure of Ytterbium(III) Trifluoromethanesulfonates as a New Type Catalyst Reviewed

    T. Yoshida, T. Tanaka, T. Yamamoto, S. Yoshida, H. Ishitani and S. Kobayashi

    Jpn. J. Appl. Phys.   Vol. 38   page: 59-61   1999

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  172. XAFS study of ytterbium complexes as new type Lewis acid catalysts Reviewed

    T. Yoshida T. Tanaka, T. Yamamoto, S. Yoshida, H. Ishitanic and S. Kobayashi

    J. Synchrotron Rad.   Vol. 6   page: 455-457   1999

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  173. Studies of irradiation effects on silica glass by XAFS

    T. Yoshida, H. Yoshida, M. Sakai, T. Hara, T. Okada and T. Tanabe

    Proc. Inter. Conf. of Silica     page: 557-560   1998

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  174. Performance of YB66 Soft X-ray Monochromator Crystal at the Wiggler Beam Line of the UVSOR Facility Reviewed

    T. Kinoshita, Y. Takata, T. Matsukawa, H. Aritani, S. Matsuo, T. Yamamoto, M. Takahashi, H. Yoshida, T.Yoshida, Y. Ufuktepe, K. G. Nath, S. Kimura, H. Kumigashira and Y. Kitajima

    J. Synchrotron Rad.   Vol. 5   page: 726-728   1998

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  175. 軟X線領域X線吸収スペクトル(Soft X-ray XAFS)の固体触媒キャラクタリゼーションへの応用 Invited Reviewed

    吉田朋子

    触媒学会誌   Vol. 39   page: 322-323   1997

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  176. The state of europium complexes on alumina sarface

    T. Yoshida, T. Tanaka, S. Yoshida, H.Handa, S. Hikita, T. Baba and Y. Ono

    J. Physique IV   Vol. 7   page: 915   1997

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  177. Structural analysis of CoO-MgO system by XAFS Reviewed

    T. Yoshida, T. Tanaka, H. Yoshida, T. Funabiki, S. Yoshida and S. Hasegawa

    J. Physique IV   Vol. 7   page: 1145-1146   1997

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  178. Epoxidation of Propene by Gaseous Oxygen over Silica and Mg-Loaded Silica under Photoirradiation Reviewed

    H. Yoshida, T. Tanaka, M. Yamamoto, T. Yoshida, T. Funabiki and S. Yoshida

    J. Catal.   Vol. 171   page: 351-357   1997

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  179. Mg K-Edge XAFS Study of Silica-Magnesia Systems Reviewed

    H. Yoshida, T. Yoshida, T. Tanaka, T. Funabiki, S. Yoshida, T. Abe, K. Kimura, T. Hattori

    J. Physique IV   Vol. 7   page: 911-912   1997

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  180. Study on the Dispersion of Ni ions in NiO-MgO System by X-ray Absorption Fine Structure

    T. Yoshida, T. Tanaka , H. Yoshida, T. Funabiki and S. Yoshida

    Journal of Physical Chemistry   Vol. 100   page: 2302   1996

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  181. Control of the structure of niobium oxide species on silica by the equilibrium method Reviewed

    H. Yoshida, T. Tanaka, T. Yoshida, T. Funabiki and S. Yoshida

    Catal. today   Vol. 28   page: 79-88   1996

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  182. XAFS Study of Niobium Oxide on Alumina Reviewed

    T. Tanaka, T. Yoshida, H. Yoshida, H. Aritani, T. Funabiki , S. Yoshida, J.M. Jehng and I. E. Wachs

    Catalyst today   Vol. 28   page: 71-78   1996

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  183. A XANES Study on the Dehydration Process of Magnesium Hydroxide

    T. Yoshida, T. Tanaka , H. Yoshida, S. Takenaka, T. Funabiki, S. Yoshida and T. Murata

    Physica B   Vol. 208&209   page: 581   1995

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  184. Study of Dehydration of Magnesium Hydroxide

    T. Yoshida, T. Tanaka , H. Yoshida, T. Funabiki, S. Yoshida and T. Murata

    Journal of Physical Chemistry   Vol. 99   page: 10890   1995

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  185. XAFS Study of Niobium Species Formed in the Steps of Preparation of Nb/SiO2 Catalysts by Equilibrium Adsorption Method Reviewed

    H. Yoshida, T. Tanaka, T. Yoshida, T. Funabiki and S. Yoshida

    Physica B   Vol. 208&209   page: 681-682   1995

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  186. Catalytic Property of Low-valent Europium Introduced into Y-zeolite Reviewed

    T. Baba, S. Hikita, Y. Ono, T. Yoshida, T. Tanaka and S. Yoshida

    Journal of Molecular Catalysis   Vol. 98   page: 49-55   1995

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  187. XANES study of Eu species encapsulated in potassium Y-type Zeolite

    T. Tanaka, T. Yoshida, S. Yoshida, T. Baba and Y. Ono

    Physica B   Vol. 208&209   page: 687   1995

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  188. Valence Variation of Yb Encapsulated in the Super cage of Y-Type Zeolite

    T. Tanaka, T. Hanada (T.Yoshida), S. Yoshida,T. Baba and Y. Ono

    Japanese Journal of Applied Physics   Vol. 32   page: 481   1993

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  189. Physico-chemical and Catalytic Properties of Ytterbium in Y-Zeolite Introduced from the Liquid Ammonia Solution Reviewed

    T. Baba, S. Hikita, R. Koide, Y. Ono, T. Hanada (T. Yoshida), T. Tanaka and S. Yoshida

    Journal of the Chemical Society, Faraday Transactions   Vol. 89 ( 16 ) page: 3177-3180   1993

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  190. Analysis of XANES for identification of highly dispersed transition metal oxide on supports

    S. Yoshida, T. Tanaka, T. Hanada (T. Yoshida), T.Hiraiwa, H. Kanai and T. Funabiki

    Catalysis Letters   Vol. 12   page: 277   1992

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Books 11

  1. 分析電子顕微鏡(EELS)

    吉田朋子, 山本宗昭( Role: Joint author ,  触媒総合事典 4-25節)

    朝倉書店  2023.2  ( ISBN:9784254252743

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    Total pages:1 online resources (xiv, 530p, 図版 [4] p)   Language:Japanese

    CiNii Books

  2. 電子顕微鏡(SEM, TEM, STEM)

    田中淳皓, 古南博, 山本宗昭, 吉田朋子( Role: Joint author ,  固体表面キャラクタリゼーション : 機能性材料・ナノマテリアルのためのスペクトロスコピー pp121-135)

    講談社  2022.3  ( ISBN:9784065261262

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    Total pages:x, 293p   Language:Japanese

    CiNii Books

  3. 人工光合成を促進する半導体光触媒への銀ナノ粒子担持効果

    山本宗昭, 吉田朋子( Role: Joint author ,  金属ナノ粒子、微粒子の合成、調製と最新応用技術 pp530-540)

    技術情報協会  2021.10  ( ISBN:9784861048623

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    Total pages:558p   Language:Japanese

    CiNii Books

  4. 脱石油に向けたCO[2]資源化技術 : 化学・生物プロセスを中心に = Carbon dioxide capture and utilization by chemical processing and bioprocessing for break away from dependence on oil

    山本宗昭, 赤柄誠人, 吉田朋子( Role: Joint author ,  光触媒表面反応に着目したCO2光還元の高効率化・機能化 pp188-198)

    シーエムシー出版  2020.7  ( ISBN:9784781315102

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    Total pages:x, 375p   Language:Japanese

    CiNii Books

  5. 黒リンの安全で高収率な溶液合成法

    小澤晃代, 吉田朋子( Role: Joint author ,  機能材料, 40巻 pp.30-38)

    2020 

  6. XAFSの基礎と応用 = Foundations and applications of XAFS

    吉田朋子( Role: Joint author ,  電子エネルギー損失分光法 pp312-318)

    講談社  2017.7  ( ISBN:9784061532953

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    Total pages:x, 341p   Language:Japanese

    CiNii Books

  7. 半導体光触媒による二酸化炭素の還元

    山本宗昭, 吉田朋子( Role: Joint author ,  機能材料, 37巻 pp33-39)

    シーエムシー出版  2017 

  8. 希土類のXANES

    吉田寿雄、吉田朋子( Role: Joint author)

    エヌ・ティー・エス  2008.5 

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    Language:Japanese

  9. 表面・界面工学大系(下巻・応用編)第2編 工業・産業に関する表面・界面技術

    吉田朋子、田中庸裕( Role: Joint author)

    2006.10 

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    Language:Japanese

  10. 固体表面キャラクタリゼーションの実際

    吉田朋子、田中庸裕( Role: Joint author)

    講談社  2005.7 

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    Language:Japanese

  11. L殻吸収端 XANES による機能性表面のキャラクタリゼーション

    吉田朋子、田中庸裕( Role: Joint author)

    化学工学会「表面の機能と応用」研究会編  1994.9 

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MISC 4

  1. プラズマ照射によるタングステン材料への光触媒機能付与 Reviewed

    吉田朋子, 菰口佳吾, 小森勝之, 梶田信, 山本宗昭

    X線分析の進歩   Vol. 54   page: 157 - 164   2023

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    Authorship:Lead author  

  2. EELSによる振動分光測定と材料物性分析 Reviewed

    山本宗昭, 吉田朋子

    ぶんせき   Vol. 9   page: 368 - 369   2023

  3. 酸化ガリウム光触媒上に担持された銀ナノ粒子のin-situ UV-Vis拡散反射及びXAFS測定. Reviewed

    山本宗昭, 北島乃樹, 田辺哲朗, 吉田朋子

    X線分析の進歩   Vol. 54   page: 165 - 172   2023

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  4. タングステン繊維状ナノ構造の光触媒への応用. Reviewed

    吉田朋子

    プラズマ・核融合学会誌   Vol. 94   page: 311 - 314   2018

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Presentations 27

  1. X線吸収スペクトル(XAFS)による触媒状態解析

    吉田朋子

    第2回触媒材料研究会 

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    Event date: 2009.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  2. XAFSによるナノ構造材料解析

    吉田朋子

    愛知県科学交流財団知的クラスター教育セミナー 

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    Event date: 2009.10

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  3. 可視光応答型チタニア光触媒における窒素状態解析

    吉田朋子,武藤俊介,久田江利子

    2009秋 第104回触媒討論会 

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    Event date: 2009.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  4. 可視光応答型チタニア光触媒における添加窒素の構造・電子状態解析

    吉田朋子,武藤俊介,久田江利子

    日本金属学会2009年秋期(第145回)講演大会 

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    Event date: 2009.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  5. XAFSによる機能元素状態解析

    吉田朋子

    2009年春季第56回応用物理学関係連合講演会シンポジウム講演 

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    Event date: 2009.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  6. Ge添加シリカガラスの紫外光発光に及ぼすGeクラスターサイズの効果

    吉田 朋子,武藤 俊介, Leny Yuliati, 吉田 寿雄,稲田 康宏

    日本金属学会2009年春期(第144回)講演大会 

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    Event date: 2009.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  7. X線吸収微細構造(放射光XAFS)

    吉田朋子

    日本金属学会セミナー 

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    Event date: 2009.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  8. XANESを利用した機能性材料分析(UVSORにおける最近の研究の中から)

    UVSORランチセミナー 

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    Event date: 2008.6

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  9. Clustering of germanium atoms in silica glass responsible for the 3.1 eV emission band studied by optical absorption and X-ray absorption fine structure analysis International conference

    T.Yoshida, S. Muto, L. Yuliati, H. Yoshida and Y. Inada

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    Event date: 2007.12

    Language:English   Presentation type:Poster presentation  

  10. 量子線と固体との相互作用

    吉田朋子

    原子力研究会 能登原子力センター 

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    Event date: 2007.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  11. Geイオン注入によるシリカガラスの紫外光領域発光サイトの発現

    吉田朋子、武藤俊介、レニ ユリアティ、吉田寿雄、稲田康宏

    日本金属学会秋期講演会 

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    Event date: 2007.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  12. 重なったELNESの成分毎のエネルギーフィルター空間分布像

    吉田朋子、武藤俊介

    日本金属学会秋期講演会 

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    Event date: 2007.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  13. 窒素イオン注入チタニア光触媒における活性種構造解析

    吉田朋子、若林 淳、武藤俊介

    日本金属学会春期講演会 

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    Event date: 2007.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  14. 内殻電子励起によるシリカ照射損傷過程の観察

    吉田 朋子,武藤 俊介,田辺哲朗

    日本金属学会春期講演会 

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    Event date: 2007.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  15. XANESで何が分かるか

    吉田朋子

    SPring-8講習会「産業利用に役立つXAFSによる先端材料の局所状態解析」 

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    Event date: 2007.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  16. Electronic state analysis of implanted nitrogen in visible-light response TiO2 photocatalyst by TEM-EELS International conference

    Lattice Defects Forum, The Doyama Symposium on Advanced Materials, “Materials to Save Humankind: The Dream, Creativity, and Working Toward its Realization" 

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    Event date: 2007

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  17. X線吸収スペクトル解析及び測定方法の開発とその応用

    吉田朋子

    京都大学大学院分子工学コロキュウム 

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    Event date: 2006.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  18. X線吸収スペクトル(XAFS)

    吉田朋子

    近畿化学協会 

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    Event date: 2006.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  19. シリカガラスの軟X線照射誘起発光測定

    吉田朋子,武藤俊介,田辺哲朗

    日本原子力学会 

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    Event date: 2006.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  20. X線照射誘起発光を利用したセラミックス中微量成分構造解析の試み

    吉田朋子

    日本金属学会秋期講演会 

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    Event date: 2006.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  21. XAFS Study on Microencapsulated Osmium Oxide Catalyst International conference

    International Conference on X-ray Absorption Fine Structure 

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    Event date: 2006.7

    Language:English   Presentation type:Poster presentation  

  22. Measurement of soft X-ray excited optical luminescence of a silica glass International conference

    International Conference on X-ray Absorption Fine Structure 

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    Event date: 2006.7

    Language:English   Presentation type:Poster presentation  

  23. アルミナの軟X線励起誘起発光

    吉田朋子、小幡祥堂、武藤俊介

    日本放射光学会 

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    Event date: 2006.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  24. XAFSから得られる情報

    吉田朋子

    近畿化学協会 

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    Event date: 2005.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  25. Utilization of gamma-ray irradiation for hydrogen production from water International conference

    Asia-Pacific Symposium on Radiochemistry 

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    Event date: 2005.10

    Language:English   Presentation type:Poster presentation  

  26. Temperature dependence of luminescence from a silica glass under in-reactor irradiation International conference

    13th International Conference Radiation Effects in Insulators 

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    Event date: 2005.8

    Language:English   Presentation type:Poster presentation  

  27. 放射線照射下におけるセラミックス材料の観察

    吉田朋子

    日本顕微鏡学会ビーム誘起・励起効果研究部会 

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    Event date: 2005.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

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KAKENHI (Grants-in-Aid for Scientific Research) 15

  1. Plasma-driven transport of reactive species from gas phase to seeds

    Grant number:24H02250  2024.4 - 2029.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Transformative Research Areas (A)

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    Authorship:Coinvestigator(s) 

  2. 新奇概念(光触媒自身のRedox反応)による高効率二酸化炭素還元触媒の開拓

    Grant number:23K17850  2023.6 - 2025.3

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    吉田 朋子, 山本 宗昭, 山本 宗昭

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    Authorship:Principal investigator 

    Grant amount:\6370000 ( Direct Cost: \4900000 、 Indirect Cost:\1470000 )

    本研究では,CO2の水による光触媒還元に対して従来考えられてきた反応機構とは全く異なった反応機構を提唱し,それを実証することで,従来の光触媒より格段に活性の高い酸化物光触媒および金属助触媒を探査・開発することに挑戦する.ここで提案する方法では,光による酸化物触媒の還元,または酸化された金属助触媒の光還元が反応律速になっており,従来の半導体光触媒のバンドギャップエネルギーよりも小さいエネルギーの光,即ち,太陽光のほぼ全波長領域を有効利用できる.紫外光しか利用できなかった従来の光触媒反応に比べて,エネルギー利用効率を飛躍的に向上させることが期待される.

  3. 触媒表面機能コア制御による二酸化炭素還元光触媒設計への挑戦

    Grant number:22H04511  2022.4 - 2024.3

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

    吉田 朋子

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    Authorship:Principal investigator 

    Grant amount:\5850000 ( Direct Cost: \4500000 、 Indirect Cost:\1350000 )

    本研究では,二酸化炭素還元反応(人工光合成)を促進するAg助触媒担持Ga2O3(Ag/Ga2O3)光触媒を対象に,Ag助触媒とGa2O3界面に形成される結晶欠陥等の活性サイト(機能コア)の局所構造・電子状態,反応機構に及ぼす効果を解明する.また,この活性サイトを模倣しながらGa2O3表面に特異な結晶欠陥を導入することで,不安定なAg助触媒を担持しなくても二酸化炭素還元を促進する高効率且つ安定な新奇光触媒を構築する.これを実現するための,合理的な触媒設計,活性サイトの可視化,反応基質と活性サイトの動的反応プロセスを観察するための測定システムの構築も目指す.
    有機ナノテンプレートを利用したり,新たに液中プラズマ法を導入することにより1 nm~数十 nmまでの様々なサイズのAgナノ粒子を合成する方法論を確立した.特に液中プラズマ法によるAgナノ粒子の合成においては,液中プラズマ放電システム(石英ガラス製反応容器,金属ロッド電極,パルス発生電源から構成)を新たに構築し,プラズマ放電条件(パルス電圧,パルス幅,周波数)や,水溶液の導電率を制御しながら,電極から銀などの金属ナノ粒子を定常的に生成させるための条件を探索し整理した.有機ナノテンプレートや液中プラズマ法を用いて合成した銀ナノ粒子助触媒を酸化ガリウム上に安定化させた光触媒(Ag/Ga2O3)を調製し,この光触媒を用いて人工光合成反応(二酸化炭素の水による還元反応)を進行させ,CO, H2, O2を生成させることに成功した.また調製した光触媒を高空間分解電子顕微鏡を用いて観察し,Ag粒子,Ag-Ga2O3界面,Ag粒子近傍のGa2O3とサイトごとに明確に区別できることを確認した.
    一方,反応基質(水やCO2分子)と光触媒最表面活性サイト(機能コア)との相互作用を観察するための複合型分光測定システムの設計に着手した.小型の真空チャンバーに試料ホルダー(試料の加熱可能)や真空ポンプを取り付けたものであり,真空排気,反応ガスの導入,光照射といった反応環境の再現が可能であるシステムを構築しつつある.
    液中プラズマ放電システムを用いた金属ナノ粒子の合成は,プラズマ工学分野を中心として,国内外でも進められてきているが,合成した金属ナノ粒子のサイズは放電後のTEM観察などによって初めて明らかになることから,合成中に金属ナノ粒子のサイズを制御することは従来困難であった.
    これに対して本研究では,水中に存在する金属ナノ粒子は,それぞれの化学状態や形状に応じて紫外・可視領域の光を吸収することを利用して,プラズマ放電中に反応容器に外部から紫外・可視光を入射させ,UV-visスペクトルのその場測定を行うことにより,金属ナノ粒子のサイズだけでなく量についても把握できるようにした.具体的には,放電時間に対する吸収波長・強度の変化と,生成した金属ナノ粒子のTEM/XAFS測定による粒子径評価を対応させ,プラズマ放電条件や時間に対する金属ナノ粒子のサイズ・量の変化をin-situ UV-visスペクトルの測定から直接評価し,ナノ粒子合成中に制御した.この試みにより液中プラズマ放電システムを用いた銀などの金属ナノ粒子の合理的な合成が可能になり,順調に研究が進んだものと思われる.
    合成した銀ナノ粒子助触媒を酸化ガリウム上に安定化させた光触媒(Ag/Ga2O3)の調製や,この光触媒を用いた人工光合成反応(二酸化炭素の水による還元反応)については,これまでの触媒調製や反応実験に関するノウハウもあり,経験も豊富であることから,問題なく実施できたと考えられる.
    前年度から引き続き,サイズ制御された金属ナノ粒子助触媒(主に銀ナノ粒子助触媒)の合成と光触媒の調製,人工光合成反応(二酸化炭素の水による還元反応)実験を実施する.また2023年度には,複合型分光測定システムを構築し,これを放射光実験施設のビームラインに取り付ける予定である.このシステムを用いて,Ag/Ga2O3光触媒に反応基質(水やCO2分子)を導入したり光照射をしながら,XAFS測定をし解析することで,反応分子と相互作用する活性サイトを同定する.
    一方,Ga2O3の多形に注目し,異なる結晶構造(α, β, γ, &#603;相など)を,α/β, β/γなど様々な組み合わせで接合する助触媒非担持型光触媒を設計したい.Ag/Ga2O3光触媒の活性サイトの構造・電子状態を模倣するように,Ga2O3中に結晶欠陥を導入することで,水による二酸化炭素還元反応において,高い活性と耐久性を示す新規光触媒の創製を目指す.更にSTEM/EELS分析によって,異なるGa2O3結晶粒の界面に形成された欠陥を可視化したり,反応中の複合的分光測定によって反応に伴う欠陥構造や反応メカニズムの変化を追跡したい.これらの測定分析法を本研究領域において提案される固体材料中の「機能コア」物性分析に応用するだけでなく,材料中の様々な結晶欠陥を応用した新奇熱触媒・光触媒の創製に関する研究へと展開するなど,多くの研究者との共同研究を強力に推進したい.

  4. Construction of new catalyst preparation method using solution plasma and rational design of artificial photosynthetic catalyst

    Grant number:21K18856  2021.7 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

    Yoshida Tomoko

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    Authorship:Principal investigator 

    Grant amount:\6500000 ( Direct Cost: \5000000 、 Indirect Cost:\1500000 )

    Silver nanoparticles (Ag NPs) were synthesized by a solution plasma method in an aqueous solution. Optical emission spectra of the plasma revealed that Ag NPs are fabricated with the sputtering of Ag rods as electrode. In-situ optical absorption measurements of the solution during the discharge, which controlled the size of Ag NPs. The synthesized Ag NPs were loaded on gallium oxide, and the sample was used for photocatalytic CO2 reduction with water
    Although the photocatalytic reaction proceeded over the sample to produce CO, the CO production rates decreased with the reaction time. Measurements of DR UV-vis spectra and TEM images revealed that a part of the Ag NPs aggregated to become larger particles during the photocatalytic reaction, which would be related to the decrease of the photocatalytic activity.

  5. 光触媒活性サイトその場分析法開発に関する国際共同研究

    Grant number:20KK0116  2020.10 - 2025.3

    日本学術振興会  科学研究費助成事業  国際共同研究加速基金(国際共同研究強化(B))

    吉田 朋子, 東 正信, 山本 旭, 山本 宗昭, 東 正信, 山本 旭, 山本 宗昭

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    Authorship:Principal investigator 

    Grant amount:\18590000 ( Direct Cost: \14300000 、 Indirect Cost:\4290000 )

    2021年度は,アルミナ,シリカ,マグネシア等の各種金属酸化物を対象に,X線で励起した時に放出される紫外・可視光領域の発光(X線励起発光)を検出しながら励起X線のエネルギーを連続的に変化させることによりXAFSスペクトルを得ることを試みた.具体的な例としては,放射光施設においてAl2O3に対してAl K-edge付近のX線を照射したところ,酸素空孔(F+ center)に由来する300nm付近の発光を微弱ながら検出することができた.Al K-edge 前後約50eVの範囲でX線エネルギーを連続的に変化させ,300nm付近の発光強度をモニターすることでスペクトルを描いたところ,従来法(全電子収量法)で測定したAl2O3のAl K-edge XANESスペクトルと同等な微細構造をもつスペクトルが得られていることを見出した.
    一方,今年度は,従来法で測定したXANESスペクトルに対してスペクトルの足し合わせや波形分離を施すことで,様々な局所構造が混在している触媒に対して,同じ元素で構成されていても異なる局所構造を定量的に分析できることを実証した.具体的には,水酸化物を様々な温度で加熱脱水させ,元の水酸化物と脱水により得られる酸化物が様々な割合で混在している状態を作り,これらのXANESスペクトルを従来法(全電子収量法)で測定した.測定されたXANESスペクトルが,水酸化物と酸化物のXANESスペクトルの線形として再現されることや,この方法により水酸化物と酸化物の割合を求められることを示した.一方,多形であるAl2O3の各結晶構造に対してXANESスペクトルを測定し,これらのXANESスペクトルの波形分離をすることによって,各結晶構造に含まれるAlO4とAlO6配位構造を定量的に区別できることも示した.

  6. Development of environmentally benign solid catalysis based on surface dynamic organometallic chemistry

    Grant number:17H03458  2017.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Wada Kenji

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    In the present study, highly-active environmentally-benign solid catalysts were developed by controlling the dynamic behaviour of organometallic species on the surface of solid crystals.
    Rutile-supported Ir catalysts that were effective for the synthesis of benzimidazoles via the dehydrogenative pathway were developed. For the synthesis of benzimidazoles via hydrogen transfer, the Ir catalysts supported on {010}/{101}-faceted anatase showed the excellent activity. Also, the P-modification of titania supports greatly enhanced the activity. The composite catalysts of Ir complexes and ceria that were active and selective for the dehydrogenative silylation of styrenes were developed. The treatment of Ru/CeO2 catalysts with PPh3 and HCHO was an efficient way to generate the active species for hydroarylation of C-C multiple bonds. A novel Fourier-transformed near-infrared imaging spectroscopic system that realized the rapid and direct analysis of organic products was developed.

  7. Understanding of Mixed Anion Compounds: Analyses of Chemical, Structural and Electronic States

    Grant number:16H06440  2016.6 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Hayashi Katsuro

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    For the evaluation of “mixed anion compounds”, the conventional research style has not been applicable and the evaluation and analysis methods had not been established at all. To overcome this, leading researchers about advanced material evaluation have collaborated with each other as well as with research groups of the synthesis and the materials functions. Regarding issues on the evaluation and characteristics of mixed anion compounds, the first half of the project focused on the methodology of light-element anion identification and relevant structural analysis, the clarification of the specificity of hydride (H-) ions, and the clarification of coordination polyhedral geometry through joint experimental and theoretical researches. After that, we focused on the dynamics of mixed anion systems, expanded to the analysis and understanding of materials systems and processes beyond crystals, and finally elaborated on the exploration and theoretical analysis of new ionic conductors.

  8. Photocatalytic formylation of amine with carbon dioxide

    Grant number:16K14477  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Yoshida Hisao, YAMAMOTO Akira, YAMAMOTO Akira

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    To utilize carbon dioxide, we examined photocatalytic formylation of amine with carbon dioxide. Metal-loaded titanium oxide photocatalyst was found to give the aimed product from carbon dioxide and some amine compounds in acetonitrile. The reaction took place only in the acetonitrile solvent. A kinetics study revealed that the C-H bond activation of acetonitrile was an important step in the reaction mechanism. Although the product was obtained without carbon dioxide in the gas phase, the amount of the product was higher in the atmosphere of gaseous carbon dioxide. Based on these results, the following reaction mechanism was proposed: the radical species, formed from acetonitrile, reacts with the carbon dioxide, which interacts with amine, to provide the aimed product.

  9. Fabrication of broadband light response high-functional photocatalysts by combination of catalyst chemistry and plasma engineering

    Grant number:16K14482  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Yoshida Tomoko, Kajita Shin, Kajita Shin

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    Authorship:Principal investigator 

    Grant amount:\3640000 ( Direct Cost: \2800000 、 Indirect Cost:\840000 )

    We investigated the photocatalysis of dendritic nanostructured WO3/W composite materials fabricated by He plasma irradiation to tungsten plates, followed by the surface oxidation. The samples promoted the decolorization reaction of methylene blue (MB) aqueous solution under near infrared (NIR) light irradiation. To verify the photocatalysis of the samples, reaction products were analysed by S K-edge XANES measurements for the MB solution kept with the samples under the light irradiation. By the light irradiation, the π*(S-C) and *(S-C) peaks in the XANES spectra reduced and a new peak originated from SO42- species was clearly observed, suggesting that S-C bonds in a MB molecule are broken by the NIR light irradiation and finally the sulfur species exists in the solution in the state of SO42-; ion. These results demonstrate that the photocatalytic decomposition of MB molecules really proceeds over WO3/W composite materials even under NIR light irradiation.

  10. 光触媒表面反応に着目した人工光合成システムの合理的設計

    Grant number:15H00871  2015.4 - 2017.3

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

    吉田 朋子

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    Authorship:Principal investigator 

    Grant amount:\3640000 ( Direct Cost: \2800000 、 Indirect Cost:\840000 )

    銀担持量の異なる銀担持酸化ガリウム光触媒(Ag/Ga2O3)を調製し,水を電子源とした二酸化炭素還元反応を行ったところ,0.1 wt% Ag/Ga2O3触媒を用いた時のCO生成速度はGa2O3触媒に比べて十数倍大きくなったが,1.0 wt% まで銀担持量を増加させると0.1 wt%担持した場合と比べて約半分までCO生成速度が小さくなった.また両触媒についてTEM観察を行った結果,0.1 wt% Ag/Ga2O3触媒中には1 nm程度のAgクラスターが主に存在しており,1.0 wt% Ag/Ga2O3触媒中では主に2 ~ 10 nmのAg粒子が多数存在していることが明らかとなった.
    Ag L3-edge XANES及びAg K-edge EXAFS解析の結果,1 nm程度のAgクラスターは,Ag-Ag結合距離がバルクAgのものと同等であることから金属種であることが分かり,更に担体との相互作用によってAg 4d軌道の電子密度がバルクAgよりも増加していることが示唆された.1.0 wt% Ag/Ga2O3触媒中の2 ~ 10 nm 程度のAg粒子については2種類のAg-Ag対が認められ,その原子間距離からAg金属粒子とAgGaO2のような複合酸化物種が混在していることが分かった.
    これらの結果を反応中におけるin-situ FT-IR測定結果と比較したところ,特に複合酸化物種はCO2の吸着サイトを増加させるものの,反応中間体bidentate-formateの生成には寄与しないのに対し,担体との相互作用の強い小さなAgクラスターはbidentate-formate生成を促進し,CO生成量を増加させることが明らかとなった.
    一方、銀助触媒の新奇な調製法として銀電極を水中で放電させることによってナノ粒子を合成する手法(液中プラズマ法)の構築を目指した.プラズマ放電条件,水に加える電解質の種類・濃度,水温によって,銀ナノ粒子のサイズを変えられることが分かり,実際に合成した銀ナノ粒子を助触媒として用いることができた.

  11. Application of hydrogen absorption/release characteristics of sulfur-poisoning nanoparticles to cancer detection

    Grant number:26289255  2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Yagi Shinya

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    We have fabricated the nanoparticles of Rh and Pd by gas evaporation method. The particle sizes of both Rh and Pd are estimated to be approximately 1-4 nm. Although a sulfur-containing molecules (mainly thiol-based molecules) adsorbed on the Rh nanoparticle surface chemically adsorbs but the adsorbed molecules does not show a dissociation reaction. Moreover the Rh nanoparticles does not show the hydrogen absorbing/releasing reaction. On the other hand, for the Pd nanoparticles, it is found that the hydrogen absorbing/releasing reaction rate is remarkably slow in comparison with the rate for without sulfur poisoning. Based on this result, we are planning to continue applying to cancer screening in the future.

  12. Design of highly active crystal photocatalysts for photocatalytic steam reforming of methane to produce hydrogen

    Grant number:25289285  2013.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Yoshida Hisao, YOSHIDA Tomoko, YOSHIDA Tomoko

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    In order to develop highly active photocatalysts for photocatalytic steam reforming of methane at low temperature, we examined to prepare some kinds of photocatalysts consisting of crystals such as titanates and tantalates. We employed a molten salt method, which is known as a good method to synthesize crystals, to prepare the photocatalysts with crystals and evaluate the photocatalytic activity and discuss the relationship between them. As a result, we successfully prepared photocatalysts having higher activity. In addition, we clarified a clear relationship between the crystallites size and the photocatalytic activity, which will widely contribute to the development of photocatalysis preparation in many reactions.

  13. Site selective structural and electronic state analysis for the design of highly active solid catalysts

    Grant number:24360332  2012.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Yoshida Tomoko

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    Authorship:Principal investigator 

    Grant amount:\18980000 ( Direct Cost: \14600000 、 Indirect Cost:\4380000 )

    In the present study, site selective XAFS measurement method using X-ray excited optical luminescence has been developed and applied to measure XAFS spectra of defect and/or emission site structures in solid materials. In addition, a sophisticated combination of XAFS and EELS, particularly introducing modern mathematical treatments to the EELS and EFTEM spectrum imaging (EFTEM-SI) allowed us quantitative analysis and visualization of the different chemical states in a solid catalyst. We applied this method to the study on the generation mechanism of the visible light response in nitrogen doped TiO2 catalysts.

  14. Application of He plasma irradiation to the preparation of a new photocatalyst

    Grant number:24656489  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    YOSHIDA Tomoko

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    Authorship:Principal investigator 

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    The dendritic nanostructure was fabricated on a surface of tungsten plate by helium plasma irradiation. The nanostructure consisting of W metal was partially oxidized to form WO3 on exposure to air, and the resulting surface exhibited a broad photoabsorption in the range from 1 to 5 eV. We examined photoinduced reaction of methylene blue (MB) on the material. It was found that the partially and fully oxidized surface nanostructures were able to promote a decolorization of MB under photoirradiation even with the near-infrared light (<1.55 eV), whose energy is lower than the band gap of WO3. The reaction rate was varied with the fraction of W and WO3 on the surface layers, that is, the partially oxidized sample promoted the reaction at a higher rate than the fully oxidized one. It is also found that the reaction rate decreased with time, which would be caused by the products accumulation on the surface and the surface oxidation.

  15. Selective functionalization of aromatic ring through C-C bond formation by photocatalysis

    Grant number:24656490  2012.4 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    YOSHIDA Hisao, KUMAGAI Jun, YOSHIDA Tomoko, KUMAGAI Jun, YOSHIDA Tomoko

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    Functionalization of aromatic ring are usually carried out under sever condition via multistep with large consumption and emission of chemicals. This motivates us to develop novel and environmentally-begin simple chemical processes that can be operated under mild condition. In this study, we successfully found that a palladium loaded titanium oxide photocatalyst could promote a simple reaction from benzene and acetonitrile to produce benzyl cyanide and hydrogen through a unique carbon-carbon bond formation. We also found that the photocatalyst functioned as a hybridized catalyst where the loaded palladium nano-particle acted as not only a reduction sites for hydrogen formation (cocatalyst of photocatalyst) but also a catalyst to directly activate benzene molecule.

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Industrial property rights 15

  1. 黒リン含有組成物の製造方法及び黒リン含有組成物

    小澤晃代, 国吉幸浩, 吉田朋子

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    Application no:特願2019-120261  Date applied:2019.6

    Announcement no:特開2021-4161  Date announced:2021.1

    Patent/Registration no:特許第7248242号  Date registered:2023.3 

  2. Method for generating electric power and electric battery

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    Application no:10/924,877  Date applied:2004.8

    Announcement no:US2005/0077876 A1 

    Patent/Registration no:U.S. Patent No. 7028477 B2  Date registered:2006.4 

    Country of applicant:Foreign country  

  3. 発電方法及び電池

    法人名大

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    Date applied:2004.8

    Announcement no:US-2005-0077876-A1  Date announced:2005.4

    Patent/Registration no:US 7,028,477 B2 

    Country of applicant:Foreign country   Country of acquisition:Foreign country

  4. 有機化合物の分解方法

    吉田朋子, 田辺哲朗, 吉田寿雄,服部 忠

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    Application no:特願2004-78398  Date applied:2004.3

    Announcement no:特開2004-209476 

    Date registered:2004.7 

    Country of applicant:Domestic  

  5. 有機化合物の分解方法

    法人名大

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    Date applied:2004.3

    Announcement no:2004-209476  Date announced:2004.7

    Patent/Registration no:04178245 

    Country of applicant:Domestic   Country of acquisition:Domestic

  6. Method for generating electric power and electric battery

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    Application no:10/727,557  Date applied:2003.12

    Announcement no:US2004/0163942 A1 

    Date registered:2004.8 

    Country of applicant:Foreign country  

  7. 発電方法及び電池

    法人名大

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    Date applied:2003.12

    Announcement no:US 2004-0163942 A1  Date announced:2004.8

    Country of applicant:Foreign country   Country of acquisition:Foreign country

  8. 発電方法及び電池

    吉田朋子, 田辺哲朗, アレンチェン

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    Application no:特願2003-312863  Date applied:2003.9

    Announcement no:特開2005-83756 

    Patent/Registration no:特許第3861154号  Date registered:2006.10 

    Country of applicant:Domestic  

  9. 発電方法及び電池

    東海国立大学機構

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    Date applied:2003.9

    Announcement no:2005-083756  Date announced:2005.3

    Patent/Registration no:03861154 

    Country of applicant:Domestic   Country of acquisition:Domestic

  10. 発電方法及び電池

    吉田朋子, 田辺哲朗

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    Application no:特願2002-362541  Date applied:2002.12

    Announcement no:特開2004-191315 

    Patent/Registration no:特許第3837528号  Date registered:2006.8 

    Country of applicant:Domestic  

  11. 発電方法及び電池

    東海国立大学機構

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    Date applied:2002.12

    Announcement no:2004-191315  Date announced:2004.7

    Patent/Registration no:03837528 

    Country of applicant:Domestic   Country of acquisition:Domestic

  12. 水素製造方法

    吉田朋子, 田辺哲朗

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    Application no:特願2001-152599  Date applied:2001.5

    Announcement no:特開2002-338201 

    Country of applicant:Domestic  

  13. 水素製造方法

    法人名大

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    Date applied:2001.5

    Announcement no:2002-338201  Date announced:2002.11

    Country of applicant:Domestic   Country of acquisition:Domestic

  14. 有機化合物の分解方法

    吉田朋子, 田辺哲朗, 吉田寿雄,服部 忠

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    Applicant:吉田朋子, 田辺哲朗, 吉田寿雄,服部 忠

    Application no:2000-155089  Date applied:2000.5

    Announcement no:2001-334262 

    Patent/Registration no:第3564532号  Date registered:2004.6 

    Country of applicant:Domestic  

  15. 有機化合物の分解方法

    法人名大

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    Date applied:2000.5

    Announcement no:2001-334262  Date announced:2001.12

    Patent/Registration no:03564532 

    Country of applicant:Domestic   Country of acquisition:Domestic

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Teaching Experience (On-campus) 1

  1. 量子材料化学

    2004

Teaching Experience (Off-campus) 1

  1. 集中講義

    2007.4 - 2008.3 九州大学)

 

Academic Activities 11

  1. 日本学術会議連携会員

    Role(s):Review, evaluation

    2023.10

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    Type:Scientific advice/Review 

  2. 日本MRS水素科学技術連携研究会理事

    Role(s):Planning, management, etc.

    2022.4

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    Type:Academic society, research group, etc. 

  3. 触媒学会理事(教育委員会委員長)

    Role(s):Planning, management, etc.

    2022.4 - 2024.3

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    Type:Academic society, research group, etc. 

  4. 文部科学省核融合技術委員会委員

    Role(s):Review, evaluation

    2021.4

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    Type:Scientific advice/Review 

  5. 日本分析化学会近畿支部役員

    Role(s):Planning, management, etc.

    2015.4 - 2024.3

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    Type:Academic society, research group, etc. 

  6. 触媒学会西日本支部東海北陸地区代議員

    Role(s):Planning, management, etc.

    2014.4 - 2015.3

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    Type:Academic society, research group, etc. 

  7. 日本金属学会金属組織写真賞委員

    Role(s):Review, evaluation

    2010.1 - 2014.12

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    Type:Academic society, research group, etc. 

  8. 日本分析化学会X線分析研究懇談会運営委員

    Role(s):Planning, management, etc.

    2009.4

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    Type:Academic society, research group, etc. 

  9. 日本金属学会男女共同参画委員会委員

    Role(s):Planning, management, etc.

    2009.4 - 2012.3

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    Type:Academic society, research group, etc. 

  10. 伊方原子力発電所環境安全管理委員会委員

    Role(s):Review, evaluation

    2008.1 - 2012.12

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    Type:Academic research 

  11. 日本原子力学会「核燃料サイクルの物質利用」研究専門委員会幹事

    Role(s):Planning, management, etc.

    2005.10 - 2015.3

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    Type:Academic society, research group, etc. 

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