Updated on 2024/03/20

写真a

 
ASAKURA Yusuke
 
Organization
Graduate School of Engineering Materials Process Engineering 2 Associate professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Materials Science and Engineering
Title
Associate professor

Research Interests 1

  1. 無機合成化学

Research Areas 1

  1. Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

Research History 5

  1. Nagoya University   Department of Materials Process Engineering, Graduate School of Engineering   Associate professor

    2023.9

  2. Nagoya University   Graduate School of Materials Process Engineering   Designated associate professor

    2023.4 - 2023.8

  3. Waseda University   Kagami Memorial Research Institute for Materials Science and Technology   Researcher (Assistant Professor)

    2021.2 - 2023.3

  4. Tohoku University   Institute of Multidisciplinary Research for Advanced Materials   Assistant Professor

    2016.10 - 2021.1

  5. The University of Tokyo

    2015.4 - 2016.9

Professional Memberships 3

  1. THE CLAY SCIENCE SOCIETY OF JAPAN

  2. The Ceramic Society of Japan

  3. THE CHEMICAL SOCIETY OF JAPAN

Committee Memberships 1

  1. 日本セラミックス協会   協会誌編集委員  

    2017.4 - 2021.5   

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    Committee type:Academic society

Awards 8

  1. 第78回(2023年度)進歩賞

    2023.12   日本セラミックス協会   液相合成に立脚した多段階プロセスによるセラミックスの構造制御

    朝倉裕介

  2. JMST2023 Excellent Article Award

    2023.11   Journal of Materials Science & Technology   SnO-SnO2 Modified Two-Dimensional MXene Ti3C2Tx for Acetone Gas Sensor Working at Room Temperature

    Zijing Wang, Fen Wang, Angga Hermawan, Yusuke Asakura, Takuya Hasegawa, Hiromu Kumagai, Hideki Kato, Masato Kakihana, Jianfeng Zhu, Shu Yin

  3. APT賞 (APT Distinguished Paper Award)

    2021.4   粉体工学会   1T/2H-MoS2 engineered by in-situ ethylene glycol intercalation for improved toluene sensing response at room temperature

    Ardiansyah Taufik, Yusuke Asakura, Hideki Kato, Masato Kakihana, Rosari Saleh, Tohru Sekino, Shu Yin

  4. 令和元年度論文賞

    2019.9   日本粘土学会   EFFECT OF INTERCALATED AMIDE MOLECULES ON INTERLAYER CONDENSATION OF LAYERED SILICATE RUB-15

    MASAKAZU KOIKE, YUSUKE ASAKURA, YOSHIYUKI KURODA, HIROAKI WADA, ATSUSHI SHIMOJIMA, KAZUYUKI KURODA

  5. ISHA2018 Best PhD Thesis Award,

    2018.8   International Solvothermal & Hydrothermal Association,   Precise Synthesis of Crystalline Nanostructured Materials from Layered Silicates by Using Interlayer Modifications

    Yusuke ASAKURA

  6. Best Paper Award,

    2018   Journal of Asian Ceramic Societies,   Synthesis of morphology controllable aluminum nitride by direct nitridation of γ-AlOOH in the presence of N2H4 and their sintering behavior

    Angga Hermawan, Hyoung Won Son, Yusuke Asakura, Takao Mori, Shu Yin

  7. 水野賞,

    2015.3   早稲田大学大学院先進理工学研究科   Precise Synthesis of Crystalline Nanostructured Materials from Layered Silicates by Using Interlayer Modifications

    朝倉 裕介

  8. 第55回粘土科学討論会 優秀講演賞

    2011.9   日本粘土学会  

    朝倉 裕介

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Papers 84

  1. Salt-assisted construction of hydrophilic carbon nitride photocatalysts with abundant water molecular adsorption sites for efficient hydrogen production Reviewed

    Chong Wang, Yichun Lu, Zequn Wang, Hongwu Liao, Weiming Zhou, Yuhe He, Sameh M, Osman, Meng An, Yusuke Asakura, Yusuke Yamauchi, Liwei Wang, Zhanhui Yuan

    Applied Catalysis B: Environment and Energy   Vol. 350   page: 123902   2024.8

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    Authorship:Corresponding author   Language:English  

    DOI: 10.1016/j.apcatb.2024.123902

  2. Structural design of Janus lamellar membrane based on bismuth oxychloride for comprehensive solar energy utilization Reviewed

    Weiming Zhou, Hongqiang Huang, Chong Wang, Liwei Wang, Xiangfeng Lin, Yusuke Asakura, Yusuke Yamauchi, Sameh M. Osman, Zhanhui Yuan

    Chemical Engineering Journal   Vol. 481   page: 148456 - 148456   2024.2

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

    DOI: 10.1016/j.cej.2023.148456

  3. Controlled synthesis of hollow carbon ring incorporated g-C3N4 tubes for boosting photocatalytic H2O2 production Reviewed

    Hao Luo, Tianshang Shan, Jianwen Zhou, Liulian Huang, Lihui Chen, Rongjian Sa, Yusuke Yamauchi, Jungmok You, Yusuke Asakura, Zhanhui Yuan, He Xiao

    Applied Catalysis B: Environmental   Vol. 337   page: 122933 - 122933   2023.11

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

    DOI: 10.1016/j.apcatb.2023.122933

  4. Water Activation in Solar‐Powered Vapor Generation Reviewed

    Dan Wei, Chengbing Wang, Jing Zhang, Heng Zhao, Yusuke Asakura, Miharu Eguchi, Xingtao Xu, Yusuke Yamauchi

    Advanced Materials   Vol. 35 ( 47 )   2023.10

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

    Abstract

    Solar‐powered vapor evaporation (SVG), based on the liquid‐gas phase conversion concept using solar energy, has been given close attention as a promising technology to address the global water shortage. At molecular level, water molecules escaping from liquid water should overcome the attraction of the molecules on the liquid surface layer to evaporate. For this reason, it is better to reduce the energy required for evaporation by breaking a smaller number of hydrogen bonds or forming weak hydrogen bonds to ensure efficient and convenient vapor production. Many novel evaporator materials and effective water activation strategies have been proposed to stimulate rapid steam production and surpass the theoretical thermal limit. However, an in‐depth understanding of the phase/enthalpy change process of water evaporation is unclear. In this review, a summary of theoretical analyses of vaporization enthalpy, general calculations, and characterization methods is provided. Various water activation mechanisms are also outlined to reduce evaporation enthalpy in evaporators. Moreover, unsolved issues associated with water activation are critically discussed to provide a direction for future research. Meanwhile, significant pioneering developments made in SVG are highlighted, hoping to provide a relatively entire chain for more scholars who are just stepping into this field.

    DOI: 10.1002/adma.202212100

  5. Bridging the Gap between Zeolites and Dense Silica Polymorphs: Formation of All‐Silica Zeolite with High Framework Density from Natural Layered Silicate Magadiite Reviewed

    Masakazu Koike, Isabel Grosskreuz, Yusuke Asakura, Ritsuro Miyawaki, Hermann Gies, Hiroaki Wada, Atsushi Shimojima, Bernd Marler, Kazuyuki Kuroda

    Chemistry – A European Journal   Vol. 29 ( 61 )   2023.9

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

    Abstract

    A silica zeolite (RWZ‐1) with a very high framework density (FD) was synthesized from highly crystalline natural layered silicate magadiite, bridging the gap between the two research areas of zeolites and dense silica polymorphs. Magadiite was topotactically converted into a 3D framework through two‐step heat treatment. The resulting structure had a 1D micropore system of channel‐like cavities with an FD of 22.1 Si atoms/1000 Å<sup>3</sup>. This value is higher than those of all other silica zeolites reported so far, approaching those of silica polymorphs (tridymite (22.6) and α‐quartz (26.5)). RWZ‐1 is a slight negative thermal expansion material with thermal properties approaching those of dense silica polymorphs. It contributes to the creation of a new field on microporous high‐density silica/silicates. Synergistic interactions are expected between the micropores with molecular sieving properties and the dense layer‐like building units with different topologies which provide thermal and mechanical stabilities.

    DOI: 10.1002/chem.202301942

  6. Hierarchical magnetic nitrogen-doped porous carbon derived from a covalent organic framework (COF) for the highly efficient removal of sulfamerazine Reviewed

    Jiale Liu, Weikang Guo, Hui Tao, Yusuke Asakura, Qin Shuai, Jeonghun Kim, Lijin Huang, Yusuke Yamauchi

    Chemical Engineering Journal   Vol. 471   page: 144544 - 144544   2023.9

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

    DOI: 10.1016/j.cej.2023.144544

  7. Materials Space‐Tectonics: Atomic‐level Compositional and Spatial Control Methodologies for Synthesis of Future Materials Reviewed

    Miharu Eguchi, Minsu Han, Yusuke Asakura, Jonathan P. Hill, Joel Henzie, Katsuhiko Ariga, Alan E. Rowan, Watcharop Chaikittisilp, Yusuke Yamauchi

    Angewandte Chemie International Edition   Vol. 62 ( 46 )   2023.8

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

    Abstract

    Reactions occurring at surfaces and interfaces necessitate the creation of well‐designed surface and interfacial structures. To achieve a combination of bulk material (i.e., framework) and void spaces, a meticulous process of “nano‐architecting” of the available space is necessary. Conventional porous materials such as mesoporous silica, zeolites, and metal–organic frameworks lack advanced cooperative functionalities owing to their largely monotonous pore geometries and limited conductivities. To overcome these limitations and develop functional structures with surface‐specific functions, the novel materials space‐tectonics methodology has been proposed for future materials synthesis. This review summarizes recent examples of materials synthesis based on designing building blocks (i.e., tectons) and their hybridization, along with practical guidelines for implementing materials syntheses and state‐of‐the‐art examples of practical applications. Lastly, the potential integration of materials space‐tectonics with emerging technologies, such as materials informatics, is discussed.

    DOI: 10.1002/anie.202307615

  8. Modulating Electronic Metal‐Support Interactions to Boost Visible‐Light‐Driven Hydrolysis of Ammonia Borane: Nickel‐Platinum Nanoparticles Supported on Phosphorus‐Doped Titania Reviewed

    Chao Wan, Gui Li, Jiapei Wang, Lixin Xu, Dang‐guo Cheng, Fengqiu Chen, Yusuke Asakura, Yunqing Kang, Yusuke Yamauchi

    Angewandte Chemie International Edition   Vol. 62 ( 40 )   2023.7

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

    Abstract

    Ammonia borane (AB) is a promising material for chemical H<sub>2</sub> storage owing to its high H<sub>2</sub> density (up to 19.6 wt %). However, the development of an efficient catalyst for driving H<sub>2</sub> evolution through AB hydrolysis remains challenging. Therefore, a visible‐light‐driven strategy for generating H<sub>2</sub> through AB hydrolysis was implemented in this study using Ni−Pt nanoparticles supported on phosphorus‐doped TiO<sub>2</sub> (Ni‐Pt/P‐TiO<sub>2</sub>) as photocatalysts. Through surface engineering, P‐TiO<sub>2</sub> was prepared by phytic‐acid‐assisted phosphorization and then employed as an ideal support for immobilizing Ni−Pt nanoparticles via a facile co‐reduction strategy. Under visible‐light irradiation at 283 K, Ni<sub>40</sub>Pt<sub>60</sub>/P‐TiO<sub>2</sub> exhibited improved recyclability and a high turnover frequency of 967.8 mol mol<sub>Pt</sub><sup>−1</sup> min<sup>−1</sup>. Characterization experiments and density functional theory calculations indicated that the enhanced performance of Ni<sub>40</sub>Pt<sub>60</sub>/P‐TiO<sub>2</sub> originated from a combination of the Ni−Pt alloying effect, the Mott–Schottky junction at the metal‐semiconductor interface, and strong metal‐support interactions. These findings not only underscore the benefits of utilizing multipronged effects to construct highly active AB‐hydrolyzing catalysts, but also pave a path toward designing high‐performance catalysts by surface engineering to modulate the electronic metal‐support interactions for other visible‐light‐induced reactions.

    DOI: 10.1002/anie.202305371

  9. Nanoarchitectonics of Hollow Covalent Organic Frameworks: Synthesis and Applications Reviewed

    Lijin Huang, Juan Yang, Yusuke Asakura, Qin Shuai, Yusuke Yamauchi

    ACS Nano   Vol. 17 ( 10 ) page: 8918 - 8934   2023.5

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

    DOI: 10.1021/acsnano.3c01758

  10. Synthesis of a Hybrid Composed of Anisotropic Niobate Layers Modified with MoC Nanoparticles

    Meilin Du, Yusuke Asakura, Takuma Kamibe, Yusuke Yamauchi, Yoshiyuki Sugahara

    Chemistry – A European Journal     2023.5

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

    DOI: 10.1002/chem.202300218

  11. Synthesis of crystal-phase and color tunable mixed anion co-doped titanium oxides and their controllable photocatalytic activity

    Jingdi Cao, Takuya Hhasegawa, Yusuke Asakura, Akira Yamakata, Peng Sun, Wenbin Cao, Shu Yin

    International Journal of Minerals, Metallurgy and Materials   Vol. 30 ( 10 ) page: 2036 - 2043   2023.4

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

    DOI: 10.1007/s12613-022-2573-6

    Other Link: https://link.springer.com/article/10.1007/s12613-022-2573-6/fulltext.html

  12. Metal–organic framework derivatives for promoted capacitive deionization of oxygenated saline water Reviewed

    Xingtao Xu, Miharu Eguchi, Yusuke Asakura, Likun Pan, Yusuke Yamauchi

    Energy & Environmental Science   Vol. 16 ( 5 ) page: 1815 - 1820   2023

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

    Metal–organic framework (MOF) derivatives, such as pyrolytic carbons, pyrolytic metal-containing carbons, and MOF-based hybrids, have been designed to replace conventionally used carbon materials for promoting capacitive deionization performance.

    DOI: 10.1039/d2ee03530h

  13. Simultaneous synthesis of hydroxyapatite fibres and β-tricalcium phosphate particles via a water controlled-release solvothermal process

    Tomoyo Goto, Shu Yin, Yusuke Asakura, Sunghun Cho, Tohru Sekino

    CrystEngComm     2023

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

    Fibrous hydroxyapatite was synthesised from α-tricalcium phosphate in ethanol and acetic acid solutions via a water controlled-release solvothermal process (WCRSP). Rice-like particles of β-tricalcium phosphate were formed by adjusting the...

    DOI: 10.1039/d2ce01703b

  14. Phase Transfer of Inorganic Nanosheets in a Water/2-Butanone Biphasic System and Lateral Size Fractionation via Stepwise Extractions

    Takuma Kamibe, Yusuke Asakura, Yoshiyuki Sugahara

    Langmuir   Vol. 39 ( 2 ) page: 820 - 828   2022.12

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

    DOI: 10.1021/acs.langmuir.2c02872

  15. Cerium(III) Niobate Layered Perovskites: Abnormal Optical Absorption Modulations by Tuning of B-Site Composition and Perovskite Layer Charge Control

    Takuya Hasegawa, Tadaharu Ueda, Yusuke Asakura, Shu Yin

    Inorganic Chemistry   Vol. 61 ( 50 ) page: 20636 - 20646   2022.12

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

    DOI: 10.1021/acs.inorgchem.2c03550

  16. Recent Advances in Ternary Metal Oxides Modified by N Atom for Photocatalysis

    Jingwen Wang, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    Catalysts   Vol. 12 ( 12 ) page: 1568 - 1568   2022.12

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    Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Ternary metal oxides (TMOs) with flexible band structures are of significant potential in the field of photocatalysis. The efficient utilization of renewable and green solar energy is of great importance to developing photocatalysts. To date, a wide range of TMOs systems has been developed as photocatalysts for water and air purification, but their practical applications in visible light-assisted chemical reactions are hindered mainly by its poor visible light absorption capacity. Introduction of N atoms into TMOs can narrow the band-gap energy to a lower value, enhance the absorption of visible light and suppress the recombination rate of photogenerated electrons and holes, thus improving the photocatalytic performance. This review summarizes the recent research on N-modified TMOs, including the influence of N doping amounts, N doping sites, and N-induced phase transformation. The introduced N greatly tuned the optical properties, electronic structure, and photocatalytic activity of the TMOs. The optimal N concentration and the influence of N doping sites are investigated. The substitutional N and interstitial N contributed differently to the band gap and electron transport. The introduced N can tune the vacancies in TMOs due to the charge compensation, which is vital for inducing different activity and selectivity. The topochemical ammonolysis process can convert TMOs to oxynitride with visible light absorption. By altering the band structures, these oxynitride materials showed enhanced photocatalytic activity. This review provides an overview of recent advances in N-doped TMOs and oxynitrides derived from TMOs as photocatalysts for environmental applications, as well as some relevant pointers for future burgeoning research development.

    DOI: 10.3390/catal12121568

  17. Morphology and facet tailoring of CaSnO3 assembled in molten salt with defect-mediated photocatalytic activity Reviewed

    Jingwen Wang, Yusuke Asakura, Takuya Hasegawa, Shu Yin

    Journal of Environmental Chemical Engineering   Vol. 10 ( 5 ) page: 108169 - 108169   2022.10

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

    DOI: 10.1016/j.jece.2022.108169

  18. Crystal-phase and Surface-Structure Engineering of MoS&lt;sub&gt;2&lt;/sub&gt; for Improving Gas Sensor Performance at Room Temperature Reviewed

    Ardiansyah Taufik, Yusuke Asakura, Takuya Hasegawa, Hideki Kato, Masato Kakihana, Rosari Saleh, Tohru Sekino, Shu Yin

    Journal of the Society of Powder Technology, Japan   Vol. 59 ( 7 ) page: 338 - 347   2022.7

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    Publishing type:Research paper (scientific journal)   Publisher:The Society of Powder Technology, Japan  

    DOI: 10.4164/sptj.59.338

  19. Synthesis of star-like BiVO<sub>4</sub> photocatalysts by organic-aqueous hetero-phase reaction: Interaction between bismuth and amino group of oleylamine Reviewed

    Taisei Hangai, Namiki Uchiyama, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    Functional Materials Letters   Vol. 15 ( 04 ) page: 2250020   2022.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:World Scientific Pub Co Pte Ltd  

    The bismuth vanadate (BiVO<sub>4</sub>) photocatalyst was successfully synthesized by an organic-aqueous hetero-phase reaction method using organic additives (oleic acid, oleyl alcohol, and oleylamine) to investigate the reaction mechanism. The BiVO<sub>4</sub> with a star-like morphology could be synthesized with oleylamine. Bismuth precursors formed by the interaction between bismuth and the amino group of oleylamine were nano-sized complex particles with amorphous phase, finally resulted in the formation of star-like morphology. Moreover, BiVO<sub>4</sub> synthesized with oleylamine showed excellent photocatalytic activity on degradation of rhodamine B.

    DOI: 10.1142/s1793604722500205

    Scopus

  20. Synthesis and color tuning of titanium oxide inorganic pigment by phase control and mixed-anion co-doping Reviewed

    Jindi Cao, Takuya Hasegawa, Yusuke Asakura, Peng Sun, Shuo Yang, Bin Li, Wenbin Cao, Shu Yin

    Advanced Powder Technology   Vol. 33 ( 5 ) page: 103576 - 103576   2022.5

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

    B and N co-doped anatase, rutile, and brookite TiO2 (abbreviated as BN-Ana, BN-Rut, and BN-Bro) were successfully synthesized. The apparent color of as-obtain BN-Ana, BN-Rut and BN-Bro was red, cyan and yellow-green, respectively. The mechanisms of various coloring were concluded as the different band gap configurations and the formation of covalent B-N bonding. The nitridation time expressed less effect on changing the color. On the contrary, nitridation temperature enabled the distinct color changes by altering the brightness. Lower temperature, fewer doping concentration, and brighter apparent color, vice versa. Through tuning the brightness, a gradient of yellow-orange-red was achieved in the case of BN-Ana, as well the transitions of grey-to-cyan and white-to-pale-yellow were achieved in BN-Rut and BN-Bro, respectively. This research proposed a method for the synthesis of color-full titania pigment without the addition of other toxic transition metal elements.

    DOI: 10.1016/j.apt.2022.103576

    Scopus

  21. Utility of NaMoO <sub>3</sub> F as a Precursor for Homogeneous Distribution of Cobalt Dopants in Molybdenum Oxynitrides Reviewed

    Yusuke Asakura, Takuya Hasegawa, Shu Yin

    Chemistry – An Asian Journal   Vol. 17 ( 10 )   2022.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/asia.202200143

    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/asia.202200143

  22. Improvement of the Oxygen Storage/Release Speed of YBaCo<sub>4</sub>O<sub>7+δ</sub> Synthesized by a Glycine-Complex Decomposition Method Reviewed

    Tingru Chen, Takuya Hasegawa, Yusuke Asakura, Masato Kakihana, Teruki Motohashi, Shu Yin

    ACS Applied Materials &amp; Interfaces   Vol. 13 ( 43 ) page: 51008 - 51017   2021.11

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

    The present study explores the oxygen storage capacity of YBaCo4O7+δ prepared by a glycine-complex decomposition method. We reported for the first time that the YBaCo4O7+δ sample was successfully synthesized at such a low temperature of 800 °C by this method. The YBCO-800 N sample exhibited a faster oxygen absorption/desorption speed than that of high calcination temperature samples, and the time required for complete oxygen storage/release was 5 and 6 min at 360 °C, respectively. Moreover, the superior performance observed for this product in the temperature swing adsorption process makes it a promising candidate in oxygen production technologies. This research demonstrated that the glycine-complex decomposition method is an effective method for improving the oxygen storage property of YBaCo4O7+δ and provides a new insight into designing other novel oxygen storage materials.

    DOI: 10.1021/acsami.1c15419

    Scopus

    PubMed

  23. An ultra-sensitive room temperature toluene sensor based on molten-salts modified carbon nitride Reviewed

    Zijing Wang, Zhanyong Gu, Fen Wang, Angga Hermawan, Shingo Hirata, Yusuke Asakura, Takuya Hasegawa, Jianfeng Zhu, Miki Inada, Shu Yin

    Advanced Powder Technology   Vol. 32 ( 11 ) page: 4198 - 4209   2021.11

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

    In this work, two-dimensional crystalline C3N4 (CCN) was obtained by promoting the self-condensation reaction of dicyandiamide in an air atmosphere via the molten salt method. Studies show that compared with polymer-C3N4 (PCN) ((9.8 m2/g)), CCN has a larger specific surface area (77.1 m2/g)) and better crystallinity. Additionally, the resistance of CCN in the air is 40 MΩ, 1250 times lower than that of polymer-C3N4 (PCN) (∼50000 MΩ). Secondly, when 50 ppm toluene gas analysis flows into the CCN based gas sensor at room temperature, the gas response value is 350. The CCN based gas sensor works for 60 days, or after 25 cycles continuously, the gas response value remains at about 350 (Rg/Ra), which is due to the excellent crystallinity, optimized π conjugate system, and enhanced interlayer van der Waals of CCN. Additionally, the critical effect of crystallinity on the gas sensitivity of carbon nitride is also discussed in detail.

    DOI: 10.1016/j.apt.2021.09.027

    Scopus

  24. High-concentration N-doped La2Ti2O7 nanocrystals: Effects of nano-structuration and doping sites on enhancing the photocatalytic activity Reviewed

    Jingwen Wang, Yusuke Asakura, Takuya Hasegawa, Shu Yin

    Chemical Engineering Journal   Vol. 423   page: 130220 - 130220   2021.11

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

    DOI: 10.1016/j.cej.2021.130220

  25. Enhanced visible-light-induced photocatalytic NOx degradation over (Ti,C)-BiOBr/Ti3C2Tx MXene nanocomposites: Role of Ti and C doping Reviewed

    Angga Hermawan, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    Separation and Purification Technology   Vol. 270   page: 118815 - 118815   2021.9

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

    DOI: 10.1016/j.seppur.2021.118815

  26. MoS2–xSex Nanoparticles for NO Detection at Room Temperature Reviewed

    Ardiansyah Taufik, Yusuke Asakura, Takuya Hasegawa, Shu Yin

    ACS Applied Nano Materials   Vol. 4 ( 7 ) page: 6861 - 6871   2021.7

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

    Molybdenum sulfide selenide (MoS2-xSex) solid solution nanoparticles were investigated to modify the crystal structure of molybdenum disulfide (MoS2) for improving the nitric oxide (NO) detection performance at room temperature. The hydrothermal reaction followed by post-annealing treatments was used to engineer the structural, morphological, and electronic properties of MoS2-xSexnanoparticles. MoS2-xSexsamples with different selenium addition ratios (x= 0, 0.2, 1, 1.8, and 2) were prepared to understand the optimum condition for NO detection. The gradual addition of the selenium atom expanded the interlayer distance and increased the lattice parametera=bfrom 3.148(0.1) Å forx= 0 to 3.279(0.08) Å forx= 2. The chemical bonding of Mo-S expands, while Mo-Se bonding compresses in MoS2-xSexsolid solution. The particle size also decreased after selenium addition from 500 nm forx= 0 to 80 nm forx= 2. The band gap also gradually decreased after selenium addition from 1.66 to 1.44 eV, which is related to an increase in the conductivity. The NO detection performance of MoS2-xSexwithx= 1 showed the highest NO detection performance with a response value of around 48% due to its small particle size, high adsorption energy, high charge transferability, and good stability. MoS2-xSexwithx= 1 detection performance was relatively stable under different humidity conditions and also was very sensitive to the NO gas molecule compared to volatile organic compound gases as well as hydrogen gas. This indicates that thex= 1 nanoparticle is very promising to be applied as a NO detection device at room temperature.

    DOI: 10.1021/acsanm.1c00926

    Scopus

  27. Remarkable Effects of Lanthanide Substitution for the Y-Site on the Oxygen Storage/Release Performance of YMnO3+δ Reviewed

    Mayu Otomo, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    ACS Applied Materials & Interfaces   Vol. 13 ( 27 ) page: 31691 - 31698   2021.7

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

    Lanthanide-substituted YMnO3+δ nanoparticles with the hexagonal phase, denoted as R0.25Y0.75MnO3+δ (R = Er, Dy, Tb, Gd, and Sm), have been successfully synthesized by the polymerized complex method. The substitutions did not largely affect the morphologies and specific surface area of the obtained R0.25Y0.75MnO3+δ nanoparticles. From the evaluation for the oxygen storage/release properties, the oxygen storage capacity (OSC) increased significantly by the Tb substitution, and the oxygen absorption/release rate strongly depended on the ion size of the substituted lanthanides. It was found that Tb4+ existed in Tb0.25Y0.75MnO3+δ after oxygen absorption, demonstrating that the remarkable increase in the OSC of the Tb-substituted sample was due to the oxidation of not only Mn3+ to Mn4+ but also Tb3+ to Tb4+. In addition, the unit cell volume increasing with the R ion size, which can lead to the promotion of the oxygen diffusion in the crystal structure, was the factor leading to the increase of the oxygen absorption rate. Especially, Sm0.25Y0.75MnO3+δ showed an excellent OSC of 3 + δ= 3.34 (the weight increase rate was 2.64 wt %) even under a rapid temperature swing rate of 20 °C/min.

    DOI: 10.1021/acsami.1c06880

    Scopus

    PubMed

  28. 水熱合成により得られた前駆体酸化物を用いた酸窒化物ナノ構造体の合成とその光機能 Invited Reviewed

    朝倉裕介, 殷澍

    ナノ学会会報   Vol. 19 ( 2 ) page: 43 - 49   2021.3

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  29. Ni-Doped Protonated Layered Titanate/TiO2 Composite with Efficient Photocatalytic Activity for NOx Decomposition Reactions Reviewed

    Kanji Saito, Shota Orikasa, Yusuke Asakura, Yusuke Ide, Yoshiyuki Sugahara, Masataka Ogasawara, Shu Yin, Sumio Kato

    International Journal of Photoenergy   Vol. 2021   page: 8847956 - 9   2021.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Hindawi Limited  

    A unique structural transformation of a lepidocrocite-type layered titanate, K0.8Ti1.73Li0.27O4, into a rutile-type TiO2 has recently been realized via dilute HCl treatment and subsequent drying at room temperature for producing rutile-nanoparticle-decorated protonated layered titanate exhibiting highly efficient photocatalytic activity. Herein, the authors report synthesis of a lepidocrocite-type layered cesium titanate with nominal compositions of <inline-formula>
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    </inline-formula>, 0.05, 0.1, and 0.35) through solid-state reactions of Cs2CO3, TiO2, and Ni(CH3COO)2·4H2O at different temperatures (600 or 800°C), followed by treatment with dilute HCl and subsequent drying to produce a Ni-doped protonated layered titanate/TiO2 composite. <inline-formula>
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    </msub>
    <mtext>N</mtext>
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    </inline-formula> with an optimized Ni content obtained at a lower temperature was converted into a Ni-doped protonated layered titanate/TiO2 composite to exhibit high photocatalytic activity for NO<inline-formula>
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    </inline-formula> decomposition reactions.

    DOI: 10.1155/2021/8847956

    Other Link: http://downloads.hindawi.com/journals/ijp/2021/8847956.xml

  30. Intrinsic carbon-doping induced synthesis of oxygen vacancies-mediated TiO2 nanocrystals: Enhanced photocatalytic NO removal performance and mechanism

    Zhanyong Gu, Zhitao Cui, Zijing Wang, Ken Sinkou Qin, Yusuke Asakura, Takuya Hasegawa, Kenta Hongo, Ryo Maezono, Shu Yin

    Journal of Catalysis   Vol. 393   page: 179 - 189   2021.1

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

    DOI: 10.1016/j.jcat.2020.11.025

  31. A simple and novel effective strategy using mechanical treatment to improve the oxygen uptake/release rate of YBaCo4O7+δ for thermochemical cycles Reviewed

    Tingru Chen, Yusuke Asakura, Takuya Hasegawa, Teruki Motohashi, Shu Yin

    Journal of Materials Science & Technology   Vol. 68   page: 8 - 15   2021

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

    DOI: 10.1016/j.jmst.2020.06.043

  32. Ce(<scp>iv</scp>)-centered charge-neutral perovskite layers topochemically derived from anionic [CeTa<sub>2</sub>O<sub>7</sub>]<sup>−</sup> layers Reviewed

    Takuya Hasegawa, Naoki Yamasaki, Yusuke Asakura, Tadaharu Ueda, Shu Yin

    Chemical Science   Vol. 12 ( 45 ) page: 15016 - 15027   2021

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

    This study proposed a new layer modification technique, “layer charge control”, for layered perovskites, and the structures of the obtained charge neutral [CeTa<sub>2</sub>O<sub>7</sub>] perovskite sheet were characterized theoretically and experimentally.

    DOI: 10.1039/d1sc03053a

    Scopus

  33. SnO-SnO2 modified two-dimensional MXene Ti3C2T for acetone gas sensor working at room temperature Reviewed

    Zijing Wang, Fen Wang, Angga Hermawan, Yusuke Asakura, Takuya Hasegawa, Hiromu Kumagai, Hideki Kato, Masato Kakihana, Jianfeng Zhu, Shu Yin

    Journal of Materials Science & Technology   Vol. 73   page: 128 - 138   2021

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

    DOI: 10.1016/j.jmst.2020.07.040

  34. Solvothermal synthesis of potassium, rubidium, and cesium molybdenum oxyfluorides Reviewed

    Yusuke ASAKURA, Takuya HASEGAWA, Shu YIN

    Journal of the Ceramic Society of Japan   Vol. 128 ( 12 ) page: 1061 - 1065   2020.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Ceramic Society of Japan  

    © 2020 The Ceramic Society of Japan. All rights reserved. Attention has recently been paid to oxyfluorides, one of the mixed anion materials, because they possess unique properties for many kinds of application fields. Because the general synthesis processes for oxyfluorides are based on troublesome methods, novel safe and facile processes are required. In this study, MoO3 was solvothermally reacted with KF, RbF, and CsF at 200 °C to form potassium, rubidium, and cesium molybdenum oxyfluorides. The reaction of MoO3 with KF and RbF led to the formation of K3MoO3F3 and Rb3MoO3F3 with a known structure, respectively, while the reaction of MoO3 with CsF induced an unknown phase which should be Cs3MoO3F3 with the similar structure to those of K3MoO3F3 and Rb3MoO3F3. A3MoO3F3 (A = K, Rb, and Cs) has not been synthesized under liquid phase until now, and this research clarified this kind of the solvothermal reaction can lead to the formation of unique oxyfluorides at low temperature. In addition, Cs3MoO3F3 was converted into Cs3Mo2O6F3 by treatment with methanol, suggesting the instability of Cs3MoO3F3. This kind of conversion reaction from one oxyfluoride to the other oxyfluoride has not been reported, and the development of such chemical conversion may lead to the formation of new oxyfluorides.

    DOI: 10.2109/jcersj2.20182

    Scopus

  35. Synthesis of NaMoO3F and Na5W3O9F5 with Morphological Controllability in Non-Aqueous Solvents Reviewed International journal

    Yusuke Asakura, Tomoyo Akahira, Makoto Kobayashi, Minoru Osada, Shu Yin

    Inorganic Chemistry   Vol. 59 ( 15 ) page: 10707 - 10716   2020.8

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

    NaMoO3F and Na5W3O9F5 were synthesized by solvothermal reaction of MoO3 and WO3, respectively, with NaF in nonaqueous solvents. These reactions were realized at low temperatures (150-200 °C) without the use of HF. This synthesis method is much more facile and safe procedure compared with general synthesis methods for oxyfluorides which includes hydrothermal reaction under a presence of HF or solid-state reaction at high temperatures in vacuum sealed tube or under high pressure. In the case of the reaction of MoO3 with NaF, the kind of solvent largely affected the obtained morphologies of NaMoO3F. The morphology in the case of acetonitrile as a solvent was rodlike with a micrometer-scale size, while that in the case of ethanol was polyhedral with a size of several hundred nanometers. In addition, the solvothermal reaction of WO3 with NaF led to the formation of Na5W3O9F5. Also, the difference of solvents for the solvothermal reaction affected the obtained particle sizes. The effect of the solvents on the morphologies of the obtained oxyfluorides probably resulted from the difference of the solubility of NaF and the subsequent dissolution ratio of MoO3 or WO3 in the used solvents. Our synthesis method can expand the applicability of oxyfluorides by providing a new phase and/or unique morphology.

    DOI: 10.1021/acs.inorgchem.0c01175

    PubMed

  36. 1T/2H-MoS<inf>2</inf> engineered by in-situ ethylene glycol intercalation for improved toluene sensing response at room temperature

    Ardiansyah Taufik, Yusuke Asakura, Hideki Kato, Masato Kakihana, Rosari Saleh, Tohru Sekino, Shu Yin

    Advanced Powder Technology   Vol. 31 ( 5 ) page: 1868 - 1878   2020.5

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    Molybdenum sulfide (MoS2) was engineered by intercalation of ethylene glycol to form 2H (semiconductor) and 1T (metallic) phases. MoS2 was successfully synthesized under solvothermal conditions with different solvents. Water, ethylene glycol (EG), and a mixture of water and EG were used as the solvent. The obtained samples were denoted as MoS2 (W), MoS2 (EG), and MoS2 (EG:W), respectively. The use of ethylene glycol as a solvent expands the (0 0 2) lattice spacing which indicated the expansion of interlayer spacing by intercalation of EG through solvothermal reaction. The MoS2 intercalated with EG possessed higher 1T phase compared to MoS2 without any intercalation. The obtained MoS2 was applied for room temperature toluene sensing with different relative humidity (RH, 20, 40, 60, 80%). The increase of relative humidity could continuously increase the base resistance and also the sensing response of MoS2 (W) and MoS2 (EG:W). For MoS2 (EG), 60% relative humidity showed the optimum condition for sensing applications. The all MoS2 (W), MoS2 (EG), and MoS2 (EG:W) had good sensing performance at 60% RH with sensing ability (ΔR/Rair%) in 100 ppm toluene around 12.50, 14.53, 16.29%, respectively. 1T-MoS2 is taking a major contribution on the sensing properties of MoS2.

    DOI: 10.1016/j.apt.2020.02.022

    Scopus

  37. 1T/2H-MoS2 engineered by in-situ ethylene glycol intercalation for improved toluene sensing response at room temperature Reviewed

    Ardiansyah Taufik, Yusuke Asakura, Hideki Kato, Masato Kakihana, Rosari Saleh, Tohru Sekino, Shu Yin

    Advanced Powder Technology   Vol. 31   page: 1868 - 1878   2020

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    IF=3.25

  38. Synthesis of three-component C3N4/rGO/C-TiO2 photocatalyst with enhanced visible-light responsive photocatalytic deNO(x) activity Reviewed

    Chiaki Noda, Yusuke Asakura, Kyohei Shiraki, Akira Yamakata, Shu Yin

    CHEMICAL ENGINEERING JOURNAL   Vol. 390   page: 124616   2020

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    In order to realize high efficiency photocatalysis deNO(x) effect, a homogeneous three-component photocatalyst, C3N4/rGO/C-TiO2 was successfully synthesized by an in situ synthesis method. First, C3N4/rGO composite was prepared to increase the contact surface between them. Then, C-TiO2 was crystallized on the surface of the C3N4/rGO to obtain relatively dispersed C-TiO2 nanoparticles on the C3N4/rGO. The as-prepared photocatalyst was evaluated by NO removal ratio under weak visible and UV LED light irradiation. C3N4/rGO/C-TiO2 was compared with sample prepared by simple mixing of C3N4, rGO and C-TiO2 within a solution. As a result, sample prepared by in situ synthesis exhibited the highest photocatalytic activity, together with high apparent quantum efficiency. The transient absorption measurement clarified that the composite photocatalyst possessed longer carrier lifetime if compared to that of each component material, resulted to its higher photocatalytic activity. The three-component photocatalyst is thought to have shown enhancement in photocatalytic activity by Z-scheme mechanism with rGO as an electron mediator to improve the performance of Z-scheme.

    DOI: 10.1016/j.cej.2020.124616

    Web of Science

  39. Synthesis of zinc germanium oxynitride nanotube as a visible-light driven photocatalyst for NOx decomposition through ordered morphological transformation from Zn2GeO4 nanorod obtained by hydrothermal reaction Reviewed International journal

    Jingwen Wang, Yusuke Asakura, Shu Yin

    JOURNAL OF HAZARDOUS MATERIALS   Vol. 396 ( 396 ) page: 122709   2020

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    Oxynitrides with narrow band gap are promising materials as visible-light sensitive photocatalysts, because introduction of nitrogen ions can negatively shift the position of valence band maximum of the corresponding oxides to negative side. (Zn1+xGe)(N2Ox) with wurtzite structure is one of the oxynitride materials. (Zn1+xGe)(N2Ox) with nanotube morphology was synthesized by nitridation of Zn2GeO4 nanorods at 800 degrees C for 6 h. During the nitridation process, the nanorod with smooth surface was transformed into nanotube with rough surface in spite of no template for formation of tube structure. The nanotube formation can be caused by ordered morphological transformation from Zn2GeO4 nanorod during the nitridation. (Zn1+xGe)(N2Ox) nanotube exhibited a large specific surface area due to its nanotube morphology and the ability to be responsive to visible light because of the narrow band gap of 2.76 eV. Compared to (Zn1+xGe)(N2Ox) synthesized by conventional solid state reaction, the optimized (Zn1+xGe)(N2Ox) nanotube possessed enhanced photocatalytic NO, decomposition activity under both ultraviolet and visible light irradiation.

    DOI: 10.1016/j.jhazmat.2020.122709

    Web of Science

  40. Alkali-assisted hydrothermal preparation of g-C<inf>3</inf>N<inf>4</inf>/rGO nanocomposites with highly enhanced photocatalytic NO<inf>x</inf> removal activity Reviewed

    Zhanyong Gu, Biao Zhang, Yusuke Asakura, Satoshi Tsukuda, Hideki Kato, Masato Kakihana, Shu Yin

    Applied Surface Science   Vol. 521 ( 521 ) page: 146213 (9pages)   2020

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    Graphitic carbon nitride / reduced graphene oxide (g-C3N4/rGO) nanocomposites have become research hotspots owing to its excellent charge carrier separation efficiency and enhanced photocatalytic activity. Herein, we developed a facile alkali-assisted hydrothermal strategy to prepare g-C3N4/rGO nanocomposites. In the hydrothermal process, the NaOH not only played an important role in etching the bulk g-C3N4 into nanosheets to increase its specific surface area and active sites, but also promoted the reduction of GO to enhance the conductivity of rGO. The rGO sheets could act as an excellent electron acceptor and electronic conductive channels to improve the separation efficiency of photogenerated electron-hole pairs. The resultant g-C3N4/rGO nanocomposites exhibited 2.7 times higher photocatalytic NOx removal activity than that of bulk g-C3N4 due to the enlarged specific surface area and the enhanced separation efficiency of photogenerated carriers. Moreover, the obtained metal-free photocatalyst displayed outstanding photocatalytic performance under visible light irradiation (λ˃400 nm), compared with previously reported traditional-metal-based semiconductor photocatalysts. This work may provide new insights into preparing g-C3N4/rGO nanocomposites with enhanced photocatalytic activity.

    DOI: 10.1016/j.apsusc.2020.146213

    Scopus

  41. Surface Engineering of 1T/2H-MoS2 Nanoparticles by O2 Plasma Irradiation as a Potential Humidity Sensor for Breathing and Skin Monitoring Applications Reviewed

    Ardiansyah Taufik, Yusuke Asakura, Takuya Hasegawa, Hideki Kato, Masato Kakihana, Shingo Hirata, Miki Inada, Shu Yin

    ACS Applied Nano Materials   Vol. 3 ( 8 ) page: 7835 - 7846   2020

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

    DOI: 10.1021/acsanm.0c01352

  42. One-step hydrothermal synthesis and thermochromic properties of chlorine-doped VO<inf>2</inf>(M) for smart window application Reviewed

    Anung Riapanitra, Yusuke Asakura, Shu Yin

    Functional Materials Letters   Vol. 13 ( 1 ) page: 1951008   2020

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    The monoclinic phase of VO2 has promising application as a smart window material because it possesses a reversible metal-to-semiconductor transformation with a critical temperature of 68 °C. The high critical temperature must be lowered to achieve a possible application. Anion doping has been widely researched as possible doping of VO2(M) with fluorine is the main option nowadays. However, other halogen elements such as chlorine have not been investigated albeit possessing possible advantages properties. In this work, we report the use of chlorine anion as doping for VO2(M) to lower its critical temperature and to enhance its thermochromic performance. The synthesis was performed using a facile one-step hydrothermal reduction of vanadium pentoxide by hydrazine at 350-490 °C, using ammonium chloride as the source of the anion. The result showed that the optimum temperature to synthesize Cl-doped VO2(M) was 490 °C. The lowest critical temperature that can be achieved by chlorine-doped VO2(M) was at 59.9 °C. The thermochromic performance of Cl-doped VO2(M) was improved compared to pristine VO2(M) nanoparticle. This finding provides a novel use of chlorine-doped VO2(M) with a facile one-step hydrothermal method to synthesize chlorine-doped VO2(M) as well as the feasibility of chlorine-doped VO2(M) as a smart window material.

    DOI: 10.1142/S1793604719510081

    Scopus

  43. Octahedral morphology of NiO with (111) facet synthesized from the transformation of NiOHCl for the NOx detection and degradation: experiment and DFT calculation Reviewed

    Angga Hermawan, Adie Tri Hanindriyo, Erland Rachmad Ramadhan, Yusuke Asakura, Takuya Hasegawa, Kenta Hongo, Miki Inada, Ryo Maezono, Shu Yin

    Inorganic Chemistry Frontiers   Vol. 7 ( 18 ) page: 3431 - 3442   2020

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    <p>NiO with polar (111) facets was successfully synthesized from the transformation of a layered NiOHCl, exhibiting excellent NO<sub>x</sub> detection and degradation activity.</p>

    DOI: 10.1039/d0qi00682c

  44. Morphology control of aluminum nitride (AlN) for a novel high-temperature hydrogen sensor Reviewed

    Angga Hermawan, Yusuke Asakura, Shu Yin

    International Journal of Minerals, Metallurgy and Materials   Vol. 27 ( 11 ) page: 1560 - 1567   2020

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

    DOI: 10.1007/s12613-020-2143-8

    Other Link: http://link.springer.com/article/10.1007/s12613-020-2143-8/fulltext.html

  45. Improvement of the O<inf>2</inf> storage/release rate of YMnO<inf>3</inf> nanoparticles synthesized by the polymerized complex method

    Yusuke Asakura, Amiko Miyake, Mayu Otomo, Shu Yin

    Dalton Transactions   Vol. 49 ( 4 ) page: 966 - 971   2020

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    YMnO3 nanoparticles with a diameter of ca. 100 nm, which were synthesized by the polymerized complex method, exhibited a high O2 storage/release rate, because nanoparticle morphology increased the O2 accessible surface area of the material. This material with a high O2 storage/release rate is promising as a separator of O2 from air.

    DOI: 10.1039/c9dt04095a

    Scopus

    PubMed

  46. Improvement of the O2 storage/release rate of YMnO3 nanoparticles synthesized by the polymerized complex method Reviewed

    Yusuke Asakura, Amiko Miyake, Mayu Otomo, Shu Yin

    Dalton Transactions   Vol. 49   page: 966 - 971   2020

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    Authorship:Lead author, Corresponding author   Language:English  

  47. High yield post-thermal treatment of bulk graphitic carbon nitride with tunable band structure for enhanced deNO<inf>x</inf> photocatalysis Reviewed

    Zhanyong Gu, Yusuke Asakura, Shu Yin

    Nanotechnology   Vol. 31 ( 11 ) page: 114001   2020

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    The bulk graphitic carbon nitride (CN) suffers from low specific surface area, which limits its practical application for air purification. Here, we reported a facile post-thermal treatment to break bulk CN into nanosheets whose specific surface areas increased from 13.6 m2 g-1 to 68.0 m2 g-1. The yield of CN nanosheets reached up to 67%, and its photocatalytic decomposition of NOx activity was about 3.0 times higher than that of bulk CN. Moreover, the CN nanosheets obtained at 550 °C with higher specific surface area (113.9 m2 g-1) displayed lower photocatalytic activity than that obtained at 500 °C with lower specific surface area (68.0 m2 g-1), which was attributed to its lower valence band. This study illustrates that many factors including specific surface area and band structure could affect the performance of photocatalysts so that it is necessary to take account of various factors. Moreover, the facile and high yield thermal treatment provides the foundation for further large-scale industrial applications.

    DOI: 10.1088/1361-6528/ab59f6

    Scopus

    PubMed

  48. CuO Nanoparticles/Ti<inf>3</inf>C<inf>2</inf>T<inf>x</inf> MXene Hybrid Nanocomposites for Detection of Toluene Gas Reviewed International journal

    Angga Hermawan, Biao Zhang, Ardiansyah Taufik, Yusuke Asakura, Takuya Hasegawa, Jianfeng Zhu, Pei Shi, Shu Yin

    ACS Applied Nano Materials   Vol. 3 ( 5 ) page: 4755 - 4766   2020

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

    Toluene is one of the harmful volatile organic compounds (VOCs) for both human health and environments. Thus, to prevent the hazardous effect of toluene, fast detection at an early stage is needed. CuO shows the merit for a wide range responsivity to VOCs but suffers from small response value, slow response/recovery speeds, and low durability. Herein, we report a facile preparation of CuO/Ti3C2Tx MXene hybrids via electrostatic self-assembly. The CuO nanoparticles (∼7 nm) were uniformly dispersed on the surface and the interlayers of the Ti3C2Tx MXene, forming hybrid heterostructures. The CuO/Ti3C2Tx MXene exhibited the improved toluene gas sensing response (Rg/Ra) of 11.4, which is nearly 5 times higher than that of the pristine CuO nanoparticles (2.3) to 50 ppm of toluene at 250 °C. Due to the different work function (φ), the Schottky junction was established at the interface of CuO/Ti3C2Tx MXene, acting as a hole trapping region (HTR) at the Ti3C2Tx MXene side. Compared to other hybrid 2D materials such as MoS2 and rGO, which possess a higher work function, the CuO/Ti3C2Tx MXene maintained better toluene sensing performance. Thus, the work function is critical for designing a high sensing performance of hybrid metal oxides/2D materials. The hybridization of CuO with Ti3C2Tx MXene improved not only enhancement of the response time but also the selectivity and the responses (270 s) and recovery times (10 s) compared with those of CuO, due to high conductivity of the metallic phase in Ti3C2Tx MXene. Such excellent performance showed the promising applications of metal oxides/2D hybrid materials for VOCs gas sensing.

    DOI: 10.1021/acsanm.0c00749

    Scopus

  49. Carbon vacancies and hydroxyls in graphitic carbon nitride: Promoted photocatalytic NO removal activity and mechanism Reviewed

    Applied Catalysis B: Environmental   Vol. 279   page: 119376   2020

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    DOI: 10.1016/j.apcatb.2020.119376

  50. Improved thermochromic and photocatalytic activities of F–VO2/Nb–TiO2 multifunctional coating films Reviewed

    Anung Riapanitra, Yusuke Asakura, Shu Yin

    Tungsten   Vol. 1   page: 306 - 317   2019.12

  51. Z-scheme water splitting by microspherical Rh-doped SrTiO3 photocatalysts prepared by a spray drying method Reviewed

    Hong Phong Duong, Mashiyama, Takahiro, Kobayashi, Makoto, Iwase, Akihide, Kudo, Akihiko, Asakura, Yusuke, Yin, Shu, Kakihana, Masato, Kato, Hideki

    APPLIED CATALYSIS B-ENVIRONMENTAL   Vol. 252   page: 222 - 229   2019.9

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    Microspherical particles of Rh-doped SrTiO3 (SrTiO3:Rh) having size of 1-2 mu m were synthesized by a spray drying (SD) method employing a water-soluble ammonium trilactatotitanate. When the calcination temperature increased up to 1200 degrees C, primary particles grew significantly while the microspherical morphology of the secondary particles was kept. Dynamic light scattering analysis proved well-dispersive nature of the SD sample. Photocatalytic activities of SrTiO3:Rh synthesized by the SD method, solid state reaction (SSR), and a poly-merizable complex (PC) method were evaluated for H-2 evolution using an electron donor such as methanol, Fe2+, or [Co(bPY)(3)](2+) and Z-scheme water splitting combined with BiVO4 of an O-2-evolving photocatalyst and either Fe3+/2+, [Co(bpy)(3)](3+/2+), or reduced graphene oxide as an electron mediator. SrTiO3:Rh prepared by the SD method showed much higher activities for all Z-scheme water splitting than the samples synthesized by the SSR method. Activities of the SD sample for Z-scheme water splitting using electron shuttles, Fe3+/2+ and [Co(bpy)(3)](3+/2+), were slightly higher or comparable to those of the PC sample whereas the SD sample achieved higher activity in Z-scheme water splitting based on interparticle electron transfer. In addition, even when the mass of SrTiO3:Rh used for the Z-scheme system with Fe3+/2+ was decreased from 50 mg to 30 mg, the SD sample still showed high activity while the activity decreased for the SSR and PC samples. Thus, usefulness of the SD method to obtain highly active SrTiO3:Rh with well-dispersive nature has been demonstrated.

    DOI: 10.1016/j.apcatb.2019.04.009

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  52. Preparation of (Zn1+xGe)(N2Ox) nanoparticles with enhanced NOx decomposition activity under visible light irradiation by nitridation of Zn2GeO4 nanoparticles designed precisely Reviewed

    Jigwan Wang, Yusuke Asakura, Shu Yin

    Nanoscale   Vol. 11   page: 20151 - 20160   2019.9

  53. Formation of silicate nanoscrolls through solvothermal treatment of layered octosilicate intercalated with organoammonium ions Reviewed

    Yusuke Asakura, Megumi Sugihara, Takeru Hirohashi, Aya Torimoto, Takuya Matsumoto, Masakazu Koike, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda

    Nanoscale   Vol. 11   page: 12924 - 12931   2019.6

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  54. One-step synthesis of micro-/mesoporous SnO<inf>2</inf> spheres by solvothermal method for toluene gas sensor Reviewed

    Angga Hermawan, Yusuke Asakura, Miki Inada, Shu Yin

    Ceramics International   Vol. 45 ( 12 ) page: 15435 - 15444   2019.5

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    A facile solvothermal synthesis in an ethanol/acetic acid mixture for the fabrication of SnO2 with a controllable hierarchical spherical size and micro-/mesoporosity is presented. SEM, TEM and N2 adsorption/desorption investigation unveiled that the obtained SnO2 spheres exhibited a particle size in the range of 0.6–1.6 μm and a pore size of about 1.4–1.9 nm depending on the volume ratio of acetic acid to ethanol in the reaction mixture, and the spheres were constructed by nanoscale particles. Due to its micro-/mesoporous structure, the SnO2 spheres exhibited large specific surface areas over 100 m2/g. When 10 vol. % of acetic acid at 200 °C for 20 h was used for the reaction, the obtained SnO2 possessed a higher specific surface area of 145 m2/g (SnO2_10). The gas sensing property of SnO2_10 without an additional noble metal co-catalyst exhibited a large toluene sensing response (Ra/Rg) of 20.2 at 400 °C, which was about 6 times higher and acceptable selectivity compared to those of other samples. The study found that the sensing performance in the SnO2 hierarchical spheres was influenced by several factors e.g. particle morphology, pore size and specific surface area rather than only a single parameter. Therefore, a precise control of those influencing parameters may lead to the optimum sensing property. These findings are important for the further development of the micro-/mesoporous metal-based oxide as an alternative successor for toluene gas sensor material.

    DOI: 10.1016/j.ceramint.2019.05.043

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  55. Utility of ZnGa2O4 Nanoparticles Obtained Hydrothermally for Preparation of GaN:ZnO Solid Solution Nanoparticles and Transparent Films Reviewed

    Yusuke Asakura, Yukiho Nishimura, Yuji Masubuchi, Shu Yin

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   Vol. 2019 ( 14 ) page: 1999 - 2005   2019.3

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

    GaN:ZnO solid solution nanoparticles and films were synthesized by using ZnGa2O4 nanoparticles with a particle size of below 25 nm obtained hydrothermally as a precursor. Nitridation of powder ZnGa2O4 nanoparticles led to the formation of GaN:ZnO nanoparticles. The nitrided samples have higher specific surface area than those obtained by conventional method, which induces higher photocatalytic NOx decomposition activity. In addition, a transparent coating film with ZnGa2O4 nanoparticles was converted to GaN:ZnO film after nitridation. The nitrided film absorbs UV and blue light and is transparent for light of wavelength over 500 nm (the transmittance is over 90 %). This means that the nitridation does not lead to the formation of scattering domains by the large-size particles and cracks. This method for film preparation is much cheaper than conventional CVD and sputtering processes. These results strongly suggest the utility of ZnGa2O4 nanoparticles not only for the formation of GaN:ZnO solid solution nanoparticles with high specific surface area but also for the preparation of transparent GaN:ZnO solid solution films.

    DOI: 10.1002/ejic.201900045

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  56. Influence of water-controlled release process on the physical and chemical property of nanosize TiO<inf>2</inf> particles Reviewed

    Xiaorong Gao, Honghong Chang, Yusuke Asakura, Zhihuan Zhao, Wenchao Gao, Yan Qiao, Shu Yin

    Materials Research Express   Vol. 6 ( 6 ) page: 0066208   2019.3

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    The water-controlled release process (WCRP) was utilized for the synthesis of TiO2 photocatalyst. The effect of alkylated esterified WCRP system on the morphology, specific surface area (SSA) and photocatalytic activity of TiO2 were studied systematically. By changing the structure of alcohol and acid involved in the esterification reaction, we found that the SSA and photocatalytic activity of TiO2 obtained in an ethanol/acetic acid reaction mixture showed the best results. Interestingly, the TiO2 obtained in t-butanol/acetic acid contains both the anatase and rutile phase, while the other systems only possessed anatase phases. The conditions of ethanol and acetic acid esterification were optimized and the experimental results showed that the SSA of nano-TiO2 was improved by shorting the reaction time or adding an organic solvent, which can form an azeotrope with water, but no effect on the photocatalytic activity could be observed. The reaction mechanism of esterified WCRP system was furthermore studied by NMR spectroscopy, showing three kinds of reaction, namely esterification, etherification and hydrolysis.

    DOI: 10.1088/2053-1591/ab0d67

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  57. Recent research progress on mixed valence state tungsten based materials Reviewed

    Shu Yin, Yusuke Asakura

    Tungsten   Vol. 1   page: 5 - 18   2019

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  58. High temperature hydrogen gas sensing property of GaN prepared from Α-GaOOH Reviewed

    Angga Hermawan, Yusuke Asakura, Makoto Kobayashi, Masato Kakihana, Shu Yin

    Sensors and Actuators, B: Chemical   Vol. 276   page: 388 - 396   2018.12

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    Extremely stable gas sensors at elevated temperature (T > 400 °C) with rapid detection of hydrogen gas are urgently demanded especially for hydrogen production industry which typically involves a high-temperature system. Gallium nitride (GaN) possesses excellent physicochemical properties and is expected to be one candidate for high temperature gas sensor. In this work, the GaN preparation from α–GaOOH precursors by a direct nitridation method under NH3 flow is presented. The nitridation was done at various temperatures to obtain GaN with different oxygen contents, which played a vital role in gas sensing response of thick film GaN in various concentration of H2 gas at 500 °C. The sensitivity of the obtained GaN with 2.07 wt.% of oxygen content was 10 times higher than that sample with the lowest oxygen content (1.9 wt.%) and the sensitivity drastically decreased when the oxygen content was 2.53 wt.%. The sensors also demonstrated high stability as indicated by their repeatable feature after being exposed at a various concentration of H2 (150–750 ppm). Furthermore, the GaN showed higher sensitivity than that of β–Ga2O3 sensor.

    DOI: 10.1016/j.snb.2018.08.021

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  59. Enhanced photocatalytic NO, decomposition of visible-light responsive F-TiO2/(N,C)-TiO2 by charge transfer between F-TiO2 and (N,C)-TiO2 through their doping levels Reviewed

    Shio Komatsuda, Yusuke Asakura, Junie Jhon M. Vequizo, Akira Yamakata, Shu Yin

    APPLIED CATALYSIS B-ENVIRONMENTAL   Vol. 15   page: 358 - 364   2018.7

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    Composite type photocatalyst F-TiO2/(N,C)-TiO2 consisted of anatase-type TiO2 with fluorine-doping (F-TiO2) and TiO2 with nitrogen and carbon-doping ((N,C)-TiO2) was prepared by simple physical mixing to exhibit higher visible-light responsive photocatalytic nitrogen oxide (NO) decomposition activity than those of F-TiO2 and (N,C)-TiO2. Transient absorption measurement clarified that the composite possessed longer carrier lifetime compared to that of each material (F-TiO2 or (N,C)-TiO2), resulting in higher photocatalytic activity. In the composite, photoexcited holes and electrons, which are not in impurity level but in valence and conduction band, respectively, should photocatalytically decompose NO, judging from the redox potential of O-2/O-2(center dot-) and the band positions of F-TiO2 and (N,C)-TiO2. The mechanism for higher visible-light photocatalytic activity, or longer carrier lifetime can be explained by charge transfer between F-TiO2 and (N,C)-TiO2 through their impurity levels. The charge transfer should make photoexcited carries spatially separated to enhance the photo catalytic activity.

    DOI: 10.1016/j.apcatb.2018.07.038

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  60. Supercritical temperature synthesis of fluorine-doped VO2(M) nanoparticle with improved thermochromic property Reviewed

    Anung Riapanitra, Yusuke Asakura, Wenbin Cao, Yasuto Noda, Shu Yin

    Nanotechnology   Vol. 29 ( 24 ) page: 244005 - 244005   2018.6

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

    DOI: 10.1088/1361-6528/aab752

    Other Link: http://iopscience.iop.org/article/10.1088/1361-6528/aab752/pdf

  61. Multifunctionality in coating films including Nb-doped TiO2 and CsxWO3: Near infrared shielding and photocatalytic properties Reviewed

    Yusuke Asakura, Yuto Anada, Ryo Hamanaka, Tsugio Sato, Ken-Ichi Katsumata, Xiaoyong Wu, Shu Yin

    Nanotechnology   Vol. 29 ( 22 ) page: 224001   2018.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Physics Publishing  

    Various types of coating films were obtained from hydrothermally synthesized Nb-doped TiO2 (NTO) and CsxWO3 (CWO) nanoparticles. The coating films possessed multifunctionality including near infrared (NIR) absorption and photocatalysis abilities. The NTO and CWO nanoparticles were synthesized by a unique solvothermal reaction in which water induced by an esterification reaction between alcohol and carboxylic acid can act as a hydrolyzing agent for metal precursors. NTO was synthesized by the unique solvothermal reaction for the first time. The reaction accompanied by the reduction of Ti4+ to Ti3+ led to the formation of nanoparticles with both NIR absorption and photocatalytic properties. The effect of the ethanol-acetic acid ratio on the morphology of the obtained NTO was investigated, and the larger amount of acetic acid led to a larger nanoparticle size, indicating the size controllability. The two types of coating film, including CWO and NTO nanoparticles, were obtained for comparison: (1) coexistent coating film: one side of the quartz glass was coated with a dispersion, including both CWO and NTO nanoparticles, and (2) double-sided coating film: a quartz glass coated with a CWO dispersion on one side and an NTO dispersion on the other side. The double-sided coating led to higher multifunctionality. Furthermore, the optimized condition for the double-sided coating was investigated by using various NTO particles obtained using different ethanol-acetic acid ratios.

    DOI: 10.1088/1361-6528/aab600

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    PubMed

  62. EFFECT OF INTERCALATED AMIDE MOLECULES ON INTERLAYER CONDENSATION OF LAYERED SILICATE RUB-15 Reviewed

    Masakazu Koike, Yusuke Asakura, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda

    Clay Science   Vol. 22 ( 1 ) page: 1 - 11   2018.3

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  63. Preparation of Stable Silver Nanoparticles Having Wide Red-To-Near-Infrared Extinction Reviewed

    Shiori Kawamura, Kazuki Matsubara, Sotaro Sakai, Kazuhisa Sasaki, Masataro Saito, Kenji Saito, Masayuki Yagi, Wataru Norimatsu, Ryo Sasai, Michiko Kusunoki, Miharu Eguchi, Shu Yin, Yusuke Asakura, Tatsuto Yui

    GLOBAL CHALLENGES   Vol. 2 ( 3 ) page: 1700105   2018.3

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

    The synthesis of silver nanoparticles (AgNPs) within the interlayer space of transparent layered titania nanosheet (TNS) films is investigated. A considerable number of silver ions (approximate to 70% against the cation exchange capacity of the TNS) are intercalated in the TNS films using methyl-viologen-containing TNSs as a precursor. The silver ion (Ag+)-containing TNS films are treated with aqueous sodium tetrahydroborate (NaBH4), resulting in a gradual color change to bright blue. Various structural analyses clearly show that crystalline AgNPs are generated within the interlayer space of the TNSs. The NaBH4-treated films show intense and characteristic near-infrared (NIR) extinction spectra up to 1800 nm. The tability of the AgNPs within the TNS against oxygen and moisture is also investigated, and 96% and 82% of the AgNPs remain after standing in air for 1 month and 1 year, respectively. The NIR extinctions of the AgNP-containing TNS films are further extended by employing different preparation procedures, for example, using sintered TNS films as starting materials and irradiating the Ag+-containing TNSs with ultraviolet (UV) light. The obtained AgNP-containing TNS films exhibit photochemical activities in the production of hydrogen from ammonia borane under visible-light irradiation and the decomposition of nitrogen monoxide under UV-light irradiation.

    DOI: 10.1002/gch2.201700105

    Web of Science

  64. Low-temperature hydrothermal synthesis and characterization of SrTiO3 photocatalysts for NOx degradation Reviewed

    Mariko Kobayashi, Yoshikazu Suzuki, Tomoyo Goto, Sung Hun Cho, Tohru Sekino, Yusuke Asakura, Shu Yin

    Journal of the Ceramic Society of Japan   Vol. 126 ( 2 ) page: 135 - 138   2018.2

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    SrTiO3 is an excellent photocatalyst due to its high photocorrosion resistance and thermal stability. In this study, we synthesized SrTiO3 nanoparticles with high specific surface areas by the hydrothermal method at reduced temperature. Titanium(IV) bis(ammonium lactato)dihydroxide (TALH) solution and strontium hydroxide octahydrate [Sr(OH)2·8H2O] were used as starting materials. SrTiO3 nanoparticles were directly synthesized by hydrothermal heating at 150°C for 72120 h. The synthesized nanoparticles had diameters of 2040 nm, and the SrTiO3 powder heated for 72 h exhibited the highest specific surface area of 33.1 m2/g. This sample also showed the highest degradation rate for NO gas.

    DOI: 10.2109/jcersj2.17195

    Scopus

  65. Synthesis of gallium oxynitride nanoparticles through hydrothermal reaction in the presence of acetylene black and their photocatalytic NO: X decomposition Reviewed

    Yusuke Asakura, Yoshiyuki Inaguma, Koichiro Ueda, Yuji Masubuchi, Shu Yin

    Nanoscale   Vol. 10 ( 4 ) page: 1837 - 1844   2018.1

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

    Gallium oxynitride (GaON) nanoparticles were synthesized through three steps
    (i) hydrothermal treatment of an aqueous solution containing Ga(NO3)3, hexamethylenetetramine (HMT), and acetylene black, (ii) calcination, and (iii) nitridation. The presence of acetylene black in the hydrothermal treatment is effective for the synthesis of Ga2O3 nanoparticles after the calcination. The intermediate obtained after the hydrothermal reaction possessed no detectable Ga particles in the TEM observation, although the presence of Ga was confirmed in the EDS measurement. This means that acetylene black (AB), in this study, cannot play a simple role as a template. The GaON nanoparticles obtained from the Ga2O3 nanoparticles through nitridation possessed a higher oxygen content than that from Ga2O3 obtained by hydrothermal synthesis without acetylene black and the subsequent calcination. The obtained GaON nanoparticles show higher photocatalytic NOx decomposition activity than bulk GaON synthesized under the same conditions except without acetylene black in the hydrothermal reaction, because of the longer absorption edge and the higher specific surface area. In addition, the effect of nitridation temperature and time on the obtained GaON nanoparticles and their photocatalytic activity was also investigated. Consequently, nanoparticle morphology of a precursor for GaON is important not only for high surface area but also for high visible-light response.

    DOI: 10.1039/c7nr07502b

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    PubMed

  66. Synthesis of morphology controllable aluminum nitride by direct nitridation of gamma-AlOOH in the presence of N2H4 and their sintering behavior Reviewed

    Angga Hermawan, HyoungWon Son, Yusuke Asakura, Takao Mori, Shu Yin

    JOURNAL OF ASIAN CERAMIC SOCIETIES   Vol. 6 ( 1 ) page: 63 - 69   2018.1

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

    Direct nitridation process has been performed to synthesize morphology controllable aluminum nitrides (AlN). Three different morphologies of gamma-AlOOH were treated under NH3 flow at 1400 degrees C for 4 h. Hydrazine (N2H4) was employed in this study as a nitriding agent to promote nitridation reaction. In the presence of hydrazine, a high purity of aluminum nitride (AlN) could be achieved with less than 5 wt.% of oxygen impurities. Interestingly, after being exposed to elevated temperatures, the initial morphology was still retained. Whereas the TEM measurement indicated surface roughening due to the release of H2O. The investigation of sintering behavior of the prepared AlN powders revealed that plate-like morphology had the lowest shrinkage completing temperature (1574 degrees C).

    DOI: 10.1080/21870764.2018.1439611

    Web of Science

  67. Activation of a particulate Ta <inf>3</inf> N <inf>5</inf> water-oxidation photoanode with a GaN hole-blocking layer Reviewed

    Yusuke Asakura, Tomohiro Higashi, Hiroshi Nishiyama, Hiroyuki Kobayashi, Mamiko Nakabayashi, Naoya Shibata, Tsutomu Minegishi, Takashi Hisatomi, Masao Katayama, Taro Yamada, Kazunari Domen

    Sustainable Energy and Fuels   Vol. 2 ( 1 ) page: 73 - 78   2018

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    © 2018 The Royal Society of Chemistry. Particulate Ta 3 N 5 , a material that responds to visible light for photoelectrochemical O 2 evolution, was glued to a metallic GaN conducting layer. The electrode was able to oxidize water with 1.8-fold higher efficiency than that without GaN. The GaN layer blocked the hole current from Ta 3 N 5 to the back-contact metal layer and prevented hole-electron recombination.

    DOI: 10.1039/c7se00402h

    Scopus

  68. エステル化反応による機能性無機ナノ粒子の創製 Reviewed

    殷澍, 常宏宏, 朝倉裕介, 佐藤次雄

    セラミックス   Vol. 53   page: 722 - 725   2018

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  69. Nanomaterials for infrared shielding smart coatings

    Shu Yin, Anung Riapanitra, Yusuke Asakura

    FUNCTIONAL MATERIALS LETTERS   Vol. 11 ( 5 ) page: 1830004   2018

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WORLD SCIENTIFIC PUBL CO PTE LTD  

    Synthesis and characterization of functional nanoparticles and their applications for smart window are reviewed. Various kinds of nanomaterials and their composites are successfully synthesized by solvothermal process. Thin films on glass substrate can be fabricated by doctor blade method using nanoparticles as starting materials. The mixed valence state tungsten-based homogeneous nanomaterials possess excellent infrared (IR) light shielding properties, implying their potential applications for the heat ray shielding and indoor energy saving effect in summer. On the other hand, VO2 monoclinic-based nanoparticles possess smart and excellent thermochromic properties, show excellent heat ray shielding effect in summer and heating effect of winter indoors. Also, multifunctionality of thin films can be realized by fabricating the composites with various functional components, implying their potential applications for IR shielding, photocatalysis and self-cleaning at the same time. The design of composites and structure of thin films might result in the enhancement or properties of practice applications on window materials.

    DOI: 10.1142/S1793604718300049

    Web of Science

  70. New method for the synthesis of β-taon oxynitride using (C6N9H3)n Reviewed

    Koichiro Ueda, Yoshiyuki Inaguma, Yusuke Asakura, Shu Yin

    Chemistry Letters   Vol. 47 ( 7 ) page: 840 - 842   2018

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    We investigated a new one-pot synthesis method for β-TaON oxynitride using (C6N9H3)n (melon) as a solid nitrogen source. β-TaON single phase was obtained from Ta2O5 using melon heating under a separated and sealed condition in a quartz glass tube. The oxygen and nitrogen contents of prepared β-TaON were almost 100% of the theoretical values.

    DOI: 10.1246/cl.180265

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  71. Recent progress on mixed-anion type visible-light induced photocatalysts Reviewed

    Zhao ZhiHuan, Fan JiMin, Chang HongHong, Asakura Yusuke, Yin Shu

    SCIENCE CHINA-TECHNOLOGICAL SCIENCES   Vol. 60 ( 10 ) page: 1447 - 1457   2017.10

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    Environmentally friendly soft chemical processes, including solvothermal/hydrothermal process and mechanochemical process, for the synthesis of mixed anion type visible-light induced photocatalysts are introduced in this review paper. Titania and strontium titanate based anion doped photocatalysts can be effectively prepared at such low-temperature as below 200 degrees C. Especially, the mechanochemical process is a useful method for the synthesis of various mixed ions doping functional materials at low temperatures. The mixed anion type photocatalytic compounds consisted of N/O, N/F/O, S/O, N/C/O, show excellent visible light absorption ability and photocatalytic activities, indicating the potential applications in environmental purifications. Full-spectra active long wavelength light induced photocatalyst, full-time active photocatalyst system and infrared radiation (IR) shielding multifunctional photocatalysts will be introduced also.

    DOI: 10.1007/s11431-016-9022-9

    Web of Science

  72. Topotactic conversion of layered silicate RUB-15 to silica sodalite through interlayer condensation in N-methylformamide Reviewed

    Masakazu Koike, Yusuke Asakura, Megumi Sugihara, Yoshiyuki Kuroda, Hidehiro Tsuzura, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda

    DALTON TRANSACTIONS   Vol. 46 ( 31 ) page: 10232 - 10239   2017.8

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    Silica sodalite was obtained using topotactic conversion of layered silicate RUB-15 through stepwise processes that consisted of the control of stacking sequence of the layers, interlayer condensation by refluxing, and elimination of intercalated guest species. The interlayer condensation of RUB-15, in which acetic acid was pre-intercalated between the layers to control the stacking sequence, afforded a sodalite framework containing organic guest species by refluxing in N-methylformamide (NMF). The pre-intercalated acetic acid molecules were largely replaced with NMF. This formation process of silica sodalite containing large amounts of intercalated organic guest species is in clear contrast to the previously reported process that used direct calcination of an intercalation compound of layered RUB-15 accommodating acetic acid between the layers. Calcination of the condensed product provided sodalite with fewer defects than the directly calcined product, thus indicating the advantage of the stepwise process. The method reported here is useful for the preparation of pure silica sodalite with relatively low defects and plate-like morphology.

    DOI: 10.1039/c7dt01287j

    Web of Science

  73. Synthesis of a Single-Crystalline Macroporous Layered Silicate from a Macroporous UTL-Type Zeolite and Its Accelerated Intercalation Reviewed

    Yusuke Asakura, Naoki Kawaura, Yoshiyuki Kuroda, Masakazu Koike, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda

    CHEMISTRY-A EUROPEAN JOURNAL   Vol. 23 ( 46 ) page: 11022 - 11029   2017.8

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

    A single-crystalline macroporous layered silicate was obtained for the first time. Firstly, UTL-type zeolite with macropores was prepared hydrothermally under the presence of acetylene black as a macropore template and the subsequent calcination to remove the template. Double four-membered ring (d4r) units in the UTL framework were selectively dissolved to yield a layered silicate with macropores. Intercalation of tetrabutylammonium ions into the macroporous layered silicate is accelerated if compared with that into the same silicate without macropores, indicating the effectiveness of macropores due to easy diffusion. The layered silicate with macropores was converted into PCR-type zeolite with macropores, a hierarchically micro- and macroporous material, through interlayer condensation.

    DOI: 10.1002/chem.201701504

    Web of Science

  74. Highly Efficient Water Oxidation Photoanode Made of Surface Modified LaTiO2N Particles Reviewed

    Seiji Akiyama, Mamiko Nakabayashi, Naoya Shibata, Tsutomu Minegishi, Yusuke Asakura, Abdulla-Al-Mamun, Takashi Hisatomi, Hiroshi Nishiyama, Masao Katayama, Taro Yamada, Kazunari Domen

    SMALL   Vol. 12 ( 39 ) page: 5468 - 5476   2016.10

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    An improved variation of highly active/durable O-2-evolving LaTiO2N powder-based photoelectrode has been fabricated by pre-cleaning the powder with mild polysulfonic acid and by homogeneous deposition of CoOx co-catalyst aided by microwave annealing. The treatment in aqueous solution of poly(4-styrene sulfonic acid) results in removal of surface LaTiO2N layers, forming fine pores in the crystallites. The CoOx co-catalyst by microwave deposition in Co(NH3)(6)Cl-3/ethylene glycol homogeneously covers the particle surface. The LaTiO2N powder is fabricated into particle-transferred electrodes on Ti thin film supported on solid substrate. The modified LaTiO2N grains on the electrode serve as a highly active O-2-evolving photoanode achieving 8.9 mA cm(-2) of the photocurrent density at 1.23 V versus reversible hydrogen electrode (RHE) in 0.1 M NaOH (pH 13) under solar-simulator irradiation Airmass 1.5 Global (AM 1.5G). The activity has been much improved, compared with conventional LaTiO2N treated in mineral acid or with CoOx deposited by impregnation. The new electrode also exhibits better durability in fixed-potential chronoamperometric tests under AM 1.5G irradiation.

    DOI: 10.1002/smll.201601929

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  75. Topotactic Structural Transformation of Layered Silicates Reviewed

      Vol. 57 ( 6 ) page: 380 - 386   2015.12

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    CiNii Books

  76. Interlayer Condensation of Protonated Layered Silicate Magadiite through Refluxing in N-Methylformamide Reviewed

    Yusuke Asakura, Nami Hosaka, Shimon Osada, Taichi Terasawa, Atsushi Shimojima, Kazuyuki Kuroda

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   Vol. 88 ( 9 ) page: 1241 - 1249   2015.9

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    Interlayer-condensed materials of protonated layered silicate (magadiite) are synthesized by refluxing in N-methylformamide (NMF) and the subsequent calcination. The obtained materials possess 2-3 times higher surface areas than calcined protonated magadiite, depending on the time of refluxing. NMF molecules in the interlayer spaces are converted to organic substances with higher thermal stability during the refluxing, which is useful for the control of the stacking sequence of silicate layers and for the following interlayer condensation to increase the microporosity. The microporosity of the material obtained by the treatment of protonated magadiite with NMF at r.t. and the subsequent calcination is similar to that of simply calcined protonated magadiite, indicating that the retention of thermally stable substances in the interlayer is critical for the increase in the pore volume and surface area of the derivative from magadiite. The method reported here will stimulate re-estimation of a large number of known layered silicate organic intercalation compounds as possible candidates for the preparation of porous silica by interlayer condensation.

    DOI: 10.1246/bcsj.20150155

    Web of Science

  77. Proton tunneling in low dimensional cesium silicate LDS-1 Reviewed

    Hiroshi Matsui, Kei Iwamoto, Dai Mochizuki, Shimon Osada, Yusuke Asakura, Kazuyuki Kuroda

    JOURNAL OF CHEMICAL PHYSICS   Vol. 143 ( 2 ) page: 24503   2015.7

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    In low dimensional cesium silicate LDS-1 (monoclinic phase of CsHSi2O5), anomalous infrared absorption bands observed at 93, 155, 1210, and 1220 cm(-1) are assigned to the vibrational mode of protons, which contribute to the strong hydrogen bonding between terminal oxygen atoms of silicate chain (O-O distance = 2.45 angstrom). The integrated absorbance (oscillator strength) for those modes is drastically enhanced at low temperatures. The analysis of integrated absorbance employing two different anharmonic double-minimum potentials makes clear that proton tunneling through the potential barrier yields an energy splitting of the ground state. The absorption bands at 93 and 155 cm(-1), which correspond to the different vibrational modes of protons, are attributed to the optical transition between the splitting levels (excitation from the ground state (n = 0) to the first excited state (n = 1)). Moreover, the absorption bands at 1210 and 1220 cm(-1) are identified as the optical transition from the ground state (n = 0) to the third excited state (n = 3). Weak Coulomb interactions in between the adjacent protons generate two types of vibrational modes: symmetric mode (93 and 1210 cm(-1)) and asymmetric mode (155 and 1220 cm(-1)). The broad absorption at 100-600 cm(-1) reveals an emergence of collective mode due to the vibration of silicate chain coupled not only with the local oscillation of Cs+ but also with the proton oscillation relevant to the second excited state (n = 2). (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4926445

    Web of Science

  78. Silylation of Layered Silicate RUB-51 with SiCl4 and Conversion of the Silylated Derivative to a Crystalline Microporous Material Reviewed

    Yusuke Asakura, Yasuhiro Sakamoto, Kazuyuki Kuroda

    CHEMISTRY OF MATERIALS   Vol. 26 ( 12 ) page: 3796 - 3803   2014.6

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    A novel crystalline microporous material is synthesized by silylation of layered silicate RUB-51 with tetrachlorosilane (SiCl4), hydrolysis, and heat treatment for interlayer condensation. One SiCl4 molecule first undergoes ordered silylation with two confronting groups, Si-O- and Si OH, on the interlayer surfaces of RUB-51 (bidentate silylation). Hydrolysis of the unreacted Si-Cl groups of the immobilized silyl groups by a mixture of H2O and dimethyl sulfoxide (DMSO) affords geminal Si-OH groups on the surfaces without simultaneous interlayer condensation because of intercalation with DMSO. Subsequent heat treatment leads to condensation between neighboring layers, and the condensed material is composed of layers of RUB-51 displaced by a half-unit cell along the a axis. Hydroxyl groups are present after interlayer cross-linking, which is one of the unique features of the method using SiCl4. The obtained sample adsorbs CO2 molecules, while RUB-51 itself without silylation cannot. The amount of adsorbed CO2 on the microporous material is larger than that of CH4, suggesting the potential of this material as a separation medium between CO2 and CH4. This study indicates that the preparation of microporous materials, using layered silicates as a building block and various silylating agents, is useful for precise design of both porosity and functional groups on pore surfaces, which drastically affect the properties of crystalline microporous materials, including catalytic selectivity and separation capability.

    DOI: 10.1021/cm5014224

    Web of Science

  79. Topotactic Conversion of beta-Helix-Layered Silicate into AST-Type Zeolite through Successive Interlayer Modifications Reviewed

    Yusuke Asakura, Ryosuke Takayama, Toshimichi Shibue, Kazuyuki Kuroda

    CHEMISTRY-A EUROPEAN JOURNAL   Vol. 20 ( 7 ) page: 1893 - 1900   2014.2

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

    AST-type zeolite with a plate morphology can be synthesized by topotactic conversion of a layered silicate (beta-helix-layered silicate; HLS) by using N,N-dimethylpropionamide (DPA) to control the layer stacking of silicate layers and the subsequent interlayer condensation. Treatment of HLS twice with 1) hydrochloric acid/ethanol and 2) dimethylsulfoxide (DMSO) are needed to remove interlayer hydrated Na ions and tetramethylammonium (TMA) ions in intralayer cup-like cavities (intracavity TMA ions), both of which are introduced during the preparation of HLS. The utilization of an amide molecule is effective for the control of the stacking sequence of silicate layers. This method could be applicable to various layered silicates that cannot be topotactically converted into three-dimensional networks by simple interlayer condensation by judicious choice of amide molecules.

    DOI: 10.1002/chem.201303368

    Web of Science

  80. Utilization of Alkoxysilyl Groups for the Creation of Structurally Controlled Siloxane-Based Nanomaterials Reviewed

    Kazuyuki Kuroda, Atsushi Shimojima, Kazufumi Kawahara, Ryutaro Wakabayashi, Yasuhiro Tamura, Yusuke Asakura, Masaki Kitahara

    CHEMISTRY OF MATERIALS   Vol. 26 ( 1 ) page: 211 - 220   2014.1

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    Silica-based materials have found many applications in various fields. Alkoxysilanes have been most widely used as precursors. Fine structural control of silica-based materials has become increasingly important for tuning their properties and for developing new functions. In this perspective, utilization of alkoxysilyl groups has been reviewed from the viewpoint of designing siloxane-based nanomaterials. Alkoxy groups have generally been used only as eliminating groups in the sol-gel processing; however, recent research has shown that they are useful for molecular assembly, for generating pores, for linking nanobuiliding blocks, and for selective synthesis of new oligosiloxane compounds.

    DOI: 10.1021/cm4023387

    Web of Science

  81. 層間化学修飾による層状ケイ酸塩の応用可能性 Reviewed

    朝倉裕介, 黒田一幸

    Journal of the Society of Inorganic Materials, Japan     2014

  82. 層状ケイ酸塩の層間縮合による多孔体形成に向けた層間修飾 Reviewed

    朝倉裕介, 黒田一幸

    ゼオライト   Vol. 31 ( 3 ) page: 78   2014

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  83. Optimal topotactic conversion of layered octosilicate to RWR-type zeolite by separating the formation stages of interlayer condensation and elimination of organic guest molecules Reviewed

    Yusuke Asakura, Shimon Osada, Nami Hosaka, Taichi Terasawa, Kazuyuki Kuroda

    DALTON TRANSACTIONS   Vol. 43 ( 27 ) page: 10392 - 10395   2014

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

    We demonstrate that the separation of two stages of interlayer condensation under refluxing and elimination of organic guests provides the optimal conditions for the formation of RWR-type zeolite from layered octosilicate. The obtained RWR-type zeolite has higher quality than any other RWR-type zeolite reported previously.

    DOI: 10.1039/c3dt53533a

    Web of Science

  84. Ordered Silylation of Layered Silicate RUB-51 with Half-Sodalite Cages Reviewed

    Yusuke Asakura, Yuki Matsuo, Nobuyuki Takahashi, Kazuyuki Kuroda

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   Vol. 84 ( 9 ) page: 968 - 975   2011.9

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    Layered silicate RUB-51 with half-sodalite cages was silylated with dichlorodimethylsilane and trichloromethylsilane. RUB-51, which possesses two confronting Si-O-/Si-OH groups on the interlayer surface, was reacted with bi/tri-functional silylating agents to induce bidentate silylation. RUB-51 silylated with dichlorodimethylsilane was delaminated through ultrasonication in cyclohexane. Layered octosilicate, which also possesses two confronting Si-O-/Si-OH groups to form a bidentate state, was reacted with the same silylating reagents. The comparison of these silylated products derived from two different layered silicates reveals that the structures of silylated interlayer surfaces are varied by the arrangement of the two Si-O-/Si-OH groups. Silylated RUB-51 possesses zigzag grooves on the layer surfaces which will be useful for silicate-based nanomaterials design.

    DOI: 10.1246/bcsj.20110143

    Web of Science

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Presentations 114

  1. 液相合成に立脚した多段階プロセスによるセラミックスの構造制御 Invited

    朝倉裕介

    日本セラミックス協会2024年年会  2024.3.15 

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    Event date: 2024.3

    Language:Japanese  

  2. Synthesis of metal/carbon hetero-bilayer scrolls

    松本 桃子, 朝倉 裕介, 山内 悠輔, 菅原 義之

    第 62 回セラミックス基礎科学討論会  2024.1.7 

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    Event date: 2024.1

    Language:English   Presentation type:Oral presentation (general)  

  3. KNiF3 を自己犠牲テンプレートとして用いた Ni(OH)2 中空粒子の合成

    宮川 夏華, 朝倉 裕介, 山内 悠輔, 菅原 義之

    第 62 回セラミックス基礎科学討論会  2024.1.7 

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    Event date: 2024.1

    Language:Japanese   Presentation type:Oral presentation (general)  

  4. Synthesis of magnetite nanoparticles modified with n-dodecylphosphonic acid in a microchannel

    Zhihong Gao, Risa Inuizawa, Naokazu Idota, Taisei Nishimi, Takehiko Tsukahara, Yusuke Asakura, Yoshiyuki Sugahara

    第 62 回セラミックス基礎科学討論会  2024.1.7 

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    Event date: 2024.1

    Language:English  

  5. Synthesis of Hollow Metal Hydroxide Nanoparticles Containing Cobalt and Iron from Metal Fluoride Nanoparticles

    Toshiki Yamada, Yusuke Asakura, Yusuke Yamauchi

    4th International Conference on Materials Science and Engineering (Materials Oceania 2023)  2023.9.28 

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    Event date: 2023.9

    Language:English   Presentation type:Poster presentation  

  6. カラフルな三結晶相酸化チタンの合成と光触媒能の向上

    曹婧頔, 朝倉裕介, 長谷川拓哉, 殷澍

    日本セラミックス協会2020年年会  2020.3.20 

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    Event date: 2020.3

    Language:English   Presentation type:Oral presentation (general)  

  7. Hydrothermal synthesis of nanocrystalline La2Ti2O7 by the addition of triethanolamine and their conversion to N-doped La2Ti2O7 and LaTiO2N

    Jingwen Wang, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    日本セラミックス協会2020年年会  2020.3.20 

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    Event date: 2020.3

    Language:English   Presentation type:Oral presentation (general)  

  8. Highly Responsive Toluene Detection Based on CuO Nanoparticle/ Ti3C2Tx Sandwich Structure International conference

    Angga Hermawan, Shu Yin, Yusuke Asakura

    21th International Symposium on Eco-materials Processing Design  2020.1.14 

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    Event date: 2020.1

    Language:English   Presentation type:Oral presentation (general)  

  9. Synthesis of Mixed Anion Doped Titania Photocatalysts by a Novel Solvothermal Process using Alcohol and Carboxylic Acid Solvents International conference

    Shu Yin, Misuzu Nakamura, Yusuke Asakura

    21th International Symposium on Eco-materials Processing Design  2020.1.13 

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    Event date: 2020.1

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

  10. 窒素ドープ層状チタン酸シートの合成と光触媒機能評価

    中村美珠々, 朝倉裕介, 長谷川拓哉, 殷澍

    第58回セラミックス基礎科学討論会  2020.1.10 

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    Event date: 2020.1

    Language:Japanese   Presentation type:Oral presentation (general)  

  11. 亜鉛含有酸窒化物薄膜の合成と機能性評価

    西村侑希保, 朝倉裕介, 長谷川拓哉, 殷澍

    第58回セラミックス基礎科学討論会  2020.1.10 

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    Event date: 2020.1

    Language:Japanese   Presentation type:Oral presentation (general)  

  12. YMnO3系酸素貯蔵材料の合成と評価

    大友真由, 三宅杏美子, 朝倉裕介, 殷澍

    第19回東北大学多元物質科学研究所研究発表会  2019.12.12 

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    Event date: 2019.12

    Language:Japanese   Presentation type:Poster presentation  

  13. The Influence of Synthesis Process on The Morphology and Oxygen Storage Performance of YBaCo4O7+δ

    陳亭儒, 朝倉裕介, 殷澍

    2019年度化学系学協会東北大会  2019.9.21 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  14. Morphological control of Na5W3O9F5 under solvothermal condition

    赤平朋代, 朝倉裕介, 殷しゅう

    2019年度化学系学協会東北大会  2019.9.21 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  15. High yield post thermal treatment of bulk graphitic carbon nitride with tunable band structure for enhanced photocatalytic decomposition of NOx(

    Gu Zhangyoung, Asakura Yusuke, Yin Shu

    2019年度化学系学協会東北大会  2019.9.22 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  16. Ethylene glycol intercalation of MoS2 for improved toluene sensing response at room temperature

    ArdiansyahTaufik, 朝倉裕介, 殷澍

    2019年度化学系学協会東北大会  2019.9.22 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  17. Synthesis of N-doped layered titanate/g-C3N4 composite and photocatalytic deNOx activity

    中村美珠々, 朝倉裕介, 殷シュウ

    2019年度化学系学協会東北大会  2019.9.22 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

  18. Zinc Germanium Oxynitride with Various Nanostructures Synthesized through Hydro/solvothermal Reaction

    Jingwen Wang, Yusuke Asakura, Shu Yin

    第57回セラミックス基礎科学討論会  2019.1.16 

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  19. アルカリ金属タングステン酸フッ化物のソルボサーマル合成

    赤平朋代, 朝倉裕介, 長谷川拓哉, 殷澍

    第59回 セラミックス基礎科学討論会  2021.1.7 

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  20. イオンドープタングステンサブオキサイド(W18O49)の合成とその赤外線遮蔽特性

    劉 涵宇, 長谷川 拓哉, 朝倉 裕介, 殷 シュウ

    日本セラミックス協会 第34回秋季シンポジウム  2021.9.2 

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  21. カルボン酸を用いたソルボサーマルプロセスによる水酸アパタイトの合成

    後藤知代, 殷しゅう, 朝倉裕介, 趙成訓, 関野徹

    日本セラミックス協会 第30回秋季シンポジウム第31回秋季シンポジウム  2018.9.2 

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  22. カーボンドープ酸化チタンおよび二次元層状物質から成る複合型光触媒の活性評価

    野田千暁, 朝倉裕介, 殷?

    日本セラミックス協会 2018年年会  2018.3.15 

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  23. ソルボサーマル反応をベースとした光触媒コンポジットの合成と活性向上

    小松田紫央, 朝倉裕介, Junie Jhon, M. Vequizo, 山方啓, 殷 シュウ

    日本セラミックス協会 第30回秋季シンポジウム第31回秋季シンポジウム  2018.9.2 

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  24. ニッケル系化合物の形態制御とその機能

    小野寺 哲洋, 朝倉 裕介, 長谷川 拓哉, 殷 シュウ

    第60回 セラミックス基礎科学討論会  2022.1.9 

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  25. フッ化物・酸フッ化物を前駆体としたナノ構造体の作製 Invited

    朝倉裕介

    日本接着学会東北・北海道地区合同セミナー  2022.10.7 

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  26. レドックス作用を持つタングステン含有新規層状ペロブスカイト酸化物の合成とエレクトロクロミック特性

    飯村玲於奈, 長谷川拓哉, 朝倉祐介, 殷澍

    2021年度化学系学協会東北大会  2021.10.3 

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  27. 有機ペロブスカイト型太陽電池への応用へ向けたエマルジョンを用いたBrookite型TiO2ナノ粒子の合成

    粕谷航平, 冨田恒之, 金子哲也, 磯村雅夫, 小林亮, 朝倉裕介, 垣花眞人

    日本セラミックス協会2021年年会  2021.3.25 

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  28. 液-液二相系での相間移動によるニオブ酸ナノシートのラテラルサイズ分離

    上邉 卓麻, 朝倉 裕介, 菅原 義之

    日本セラミックス協会 第35回秋季シンポジウム  2022.9.15 

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  29. 液相合成により得られる前駆体を用いた中空ニッケル窒化物の合成

    小野寺哲洋, 朝倉裕介, 長谷川拓哉, 殷 シュウ

    2021年度化学系学協会東北大会  2021.10.2 

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  30. 種々の層状ケイ酸塩のナノスクロール化

    廣橋武, 杉原めぐみ, 小池正和, 朝倉裕介, 黒田義之, 和田宏明, 下嶋敦, 黒田一幸

    第34回ゼオライト研究発表会  2018.11.29 

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  31. 精密無機合成に向けた液相前駆体合成 Invited

    朝倉裕介

    2019 年度 エンジニアリングセラミックス若手セミナー  2019.8.28 

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  32. 薄層化した層状ケイ酸塩RUB-15の液相中での層間縮合によるsodaliteへの転換

    小池正和, 朝倉裕介, 和田宏明, 下嶋敦, 黒田一幸

    第34回ゼオライト研究発表会  2018.11.29 

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  33. 遷移金属フッ化物を犠牲鋳型として用いたコバルト系中空ナノ構造体の合成

    朝倉 裕介, 山内 悠輔, 菅原 義之

    日本セラミックス協会 第35回秋季シンポジウム  2022.9.16 

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  34. 酸化物ナノ粒子を出発物質とした酸窒化物の形態制御 Invited

    朝倉裕介, 殷?

    令和元年度プロセス研究会 第3回講演会  2019.12.8 

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  35. 酸窒化物セラミックスの形態制御と機能性評価

    殷澍, アンガ ヘルマワン, 朝倉裕介

    2018年度セラミックス総合研究会  2018.11.9 

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  36. 酸窒化物ナノ構造体の合成とその機能

    朝倉裕介, 殷しゅう

    アライアンス若手研究交流会  2018.11.1 

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  37. 酸窒化物形態制御における酸化物ナノ粒子の有用性

    朝倉裕介, 殷?

    第7回アライアンス若手研究交流会  2019.11.12 

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  38. 鎖状ケイ酸塩の低温での酸処理

    小松 礼佳, 小池 正和, 新井 貴子, 長田 師門, 朝倉 裕介, 和田 宏明, 下嶋 敦, 黒田 一幸

    第63回粘土科学討論会  2019.9.11 

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  39. 電荷分離の促進を目指した複合化による可視光応答型炭素ドープ酸化チタンの光触媒能

    野田千暁, 朝倉裕介, 殷澍

    第57回セラミックス基礎科学討論会  2019.1.16 

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  40. YMnO3+δ の酸素吸収/放出能に対するナノ粒子化及び Y サイト元素置換の効果

    大友真由, 長谷川拓哉, 朝倉裕介, 殷澍

    第59回 セラミックス基礎科学討論会  2021.1.7 

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  41. Multifunctional Coating of Nb-doped TiO2 and VO2(M)

    Anung Riapanitra, Yusuke Asakura, Shu Yin

    マテリアル・ファブリケーション・デザインセミナー「革新的なナノ材料の創製から、実用ナノ材料のイノベーション」  2019.3.4 

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  42. MoあるいはWを含む酸フッ化物のソルボサーマル合成

    朝倉裕介, 稲熊宜之, 植田紘一郎, 殷澍

    日本セラミックス協会2019年年会  2019.3.24 

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  43. Morphology-controlled Synthesis of Zinc Germanium Oxynitride and its High Photocatalytic NOx Decomposition Activity under Visible Light Irradiation International conference

    Jingwen Wang, Yusuke Asakura, Shu Yin

    The 5th International Conference on Advanced Electromaterials (ICAE 2019)  2019.11 

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  44. Morphology Control and Characterization of Nitride and Oxynitride Based Materials International conference

    S.Yin, A. Hermawan, Y.Asakura

    15th IUPAC International Conference on Novel Materials and their Synthesis (NMS-XV)  2019.9 

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  45. Morphological Control of Zinc Oxide Micron Particles and their Characterization International conference

    Yukiho Nishimura, Yusuke Asakura, Akiko Sumiyoshi, Ai Oyama, Takayuki Kumei, Shu Yin

    6th International Solvothermal and Hydrothermal Association Conference (ISHA2018)  2018.8.8 

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  46. Morphological Control of Ta/N-Doped Titania by a Water Controlled-Release Solvothermal Process and its Photocatalytic DeNOX Activity International conference

    Misuzu Nakamura, Yusuke Asakura, Shu Yin

    The 5th International Conference on Advanced Electromaterials (ICAE 2019)  2019.11 

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  47. Molten salt flux synthesis of defective CaSnO3 with tailoring morphology and enhanced photocatalytic activity

    Wang Jingwen, Hasegawa Takuya, Asakura Yusuke, Yin Shu

    日本セラミックス協会 第35回秋季シンポジウム  2022.9.15 

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  48. Microwave assisted hydrothermal synthesis of ion doped vanadium oxide and its infrared shielding property

    鈴木野々香, 長谷川拓哉, 朝倉裕介, 殷シュウ

    2021年度化学系学協会東北大会  2021.10.3 

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  49. Micro-/ Nanostructure Control of Photocatalytic Materials and Their Applications International conference

    S.Yin, M. Nakamura, Y.Asakura

    The 5th International Symposium on Microscopy and Microanalysis of Materials (ISMMM2019)  2019.7 

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  50. Improvement of toluene gas sensing response of SnO2 microspheres after CuO nanoparticles decoration

    Angga Hermawan, Yusuke Asakura, Shu Yin

    無機マテリアル学会第137回講演会  2018.11.16 

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  51. Improvement of the Oxygen Storage/Release Rate of YBaCo4O7 Nanoparticles by the Polymerizable Complex Method

    Tingru Chen, Yusuke Asakura, Takuya Hasegawa, Teruki Motohashi, Shu Yin

    International Symposium on Functional Materials, The 8th ICMAP & The 9th ISFM  2021.1.18 

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  52. Hydroxyapatite Formation from a-tricalcium Phosphate Treated by Water Controlled-release Solvothermal Process International conference

    Tomoyo Goto, Shu Yin, Yusuke Asakura, Sung Hun Cho, Tohru Sekino

    6th International Solvothermal and Hydrothermal Association Conference (ISHA2018)  2018.8.8 

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  53. Hydrothermal synthesis of mix-ion doped vanadium oxide and its infrared shielding property

    Nonoko Suzuki, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    第60回 セラミックス基礎科学討論会  2022.1.8 

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  54. Hydrothermal Synthesis of Halogen-doped Vanadium Oxide Materials with Improved Thermochromic Performances International conference

    Anung Riapanitra, Yusuke Asakura, Shu Yin

    19th International Symposium on Eco-Materials Processing and Design  2018.2.19 

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  55. Hydrothermal Synthesis and Thermochromic Properties of Halogen Doped Vanadium Oxides Material

    Anung Riapanitra, Yusuke Asakura, Shu Yin

    日本セラミックス協会 2018年年会  2018.3.15 

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  56. High Temperature Hydrogen Gas Sensing Property of Morphology Controllable Nitrides

    Shu Yin, Angga Hermawan, Takuya Hasegawa, Yusuke Asakura

    International Symposium on Functional Materials, The 8th ICMAP & The 9th ISFM  2021.1.18 

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  57. High Oxygen Storage Performance of YBaCo4O7+δ with a Novel Synthesis Process International conference

    CHEN, Tingru, ASAKURA, Yusuke, YIN, Shu

    The 13th Pacific Rim Conference on Ceraminc Societies (PACRIM13)  2019.10 

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  58. High Oxygen Storage Performance of YBaCo4O7 with a coprecipitation method

    Tingru Chen, Yusuke Asakura, Shu Yin

    第19回東北大学多元物質科学研究所研究発表会  2019.12.12 

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  59. Green Chemical Synthesis and Characterization of Morphology Controllable Nitrides and Oxynitrides International conference

    S.YIN, Angga HERMAWAN, Y. ASAKURA

    The International Forum on Functional Materials (IFFM2019)  2019.6 

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  60. Gallium-based Oxynitride Nanoparticels and their Photocatalytic Activity International conference

    Yusuke Asakura, Shu Yin

    14th International Ceramics Congress  2018.6.4 

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  61. Formation of Nanostructured Zinc Germanium Oxynitrides Invited

    Yusuke Asakura

    Internaitonal Conference on Materials Science and Engineering (Materials Sceicne and Engineering 2021)  2021.10.13 

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  62. Formation of Crystalline Silicate Nanoscrolls fromLayered Silicate Magadiite International conference

    Takeru Hirohashi, Megumi Sugihara, Masakazu Koike, Yusuke Asakura, Yoshiyuki Kuroda, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kuroda

    International Symposium on Zeolites and Microporous Crystals 2018 (ZMPC2018)  2018.8.9 

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  63. Facile strategy to enhance the visible-light photocatalytic activity of graphitic carbon nitride by alkaline hydrothermal treatment and hybridizing with graphene simultaneously

    Zhanyong Gu, Yusuke Asakura, Shu Yin

    平成30年度 日本セラミックス協会 東北北海道支部研究発表会  2018.11.3 

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  64. Excellent Gas Sensing Property of Micro- and Mesoporous Tin Oxide Spheres Synthesized by a Water Controlled-Release Solvothermal Process International conference

    Angga Hermawan, Yusuke Asakura, Shu Yin

    The 5th International Conference on Advanced Electromaterials (ICAE 2019)  2019.11 

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  65. Enhanced Visible Light Induced DeNOx Activity of Composite Type Photocatalysts International conference

    S.YIN, S. KOMATSUDA, C. NODA, Y. ASAKURA

    The Eighth International Symposium on Physics of Fluids (ISPF8)  2019.6 

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  66. Effects of morphology tuning and oxide defect on photocatalytic activity of calcium stannate

    Jingwen Wang, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    International Conference on Mixed Anion Compounds  2021.12.9 

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  67. Dion-Jacobson 型層状ペロブスカイトの窒化反応によるペロブスカイト型酸窒化物 LaTaON2 の合成

    朝倉裕介, 植田紘一郎, 稲熊宜之, 殷しゅう

    日本セラミックス協会 第30回秋季シンポジウム第31回秋季シンポジウム  2018.9.2 

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  68. Development of Novel Plate-like Zinc Oxide Powders with Porous Structure and its Application to Foundation International conference

    A.Sumiyoshi, A.Oyama, T. Kumei, Y. Nishimura, Y. Asakura, S. Yin

    30th IFSCC Congress  2018.9.18 

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  69. C3N4関連化合物を固体窒素源に用いた β-TaON の新規合成法

    植田紘一郎, 稲熊宜之, 朝倉裕介, 殷しゅう

    日本セラミックス協会 第30回秋季シンポジウム第31回秋季シンポジウム  2018.9.2 

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  70. B/N Anions Co-doped Multi-crystalline TiO2 and Its Photocatalytic Activity International conference

    CAO, Jingdi, ASAKURA, Yusuke, YIN, Shu

    The 13th Pacific Rim Conference on Ceraminc Societies (PACRIM13)  2019.10 

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  71. Alkali-assisted Hydrothermal Preparation of Graphitic Carbon Nitride/graphene Nanocomposites with Enhanced Visible-light Photocatalytic Activity

    Zhanyong Gu, Yusuke Asakura, Shu Yin

    第57回セラミックス基礎科学討論会  2019.1.16 

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  72. 1T/2H-MoS2 engineering for improved toluene detection response at room temperature

    Ardiansyah Taufik, Yusuke Asakura, Hideki Kato, Masato Kakihana, Rosari Saleh, Tohru Sekino, Shu Yin

    The 8th Asian Particle Technology APT2021  2021.10.12 

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  73. Synthesis of Nanostructured Oxynitrides and their Functions Invited

    朝倉裕介, 殷しゅう

    平成30年度 化学系学協会東北大会  2018.9.15 

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  74. Synthesis of Ta/N-Doped Titania from Layered Potassium Titanate by Water Controlled Release Solvothermal Process and its Photocatalytic DeNOx Activity International conference

    Misuzu Nakamura, Yusuke Asakura, Shu Yin

    6th International Solvothermal and Hydrothermal Association Conference (ISHA2018)  2018.8.8 

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  75. Synthesis of Zinc Germanium Oxynitride with Nanotube Morphology by Nitridation of Zn2GeO4 Nanorod and its Photocatalytic Activity

    Jingwen Wang, Yusuke Asakura, Shu Yin

    日本セラミックス協会 第30回秋季シンポジウム第31回秋季シンポジウム  2018.9.2 

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  76. Synthesized oxygen storage material YBaCo4O7+ at low temperature by glycine- complex decomposition method

    Tingru Chen, Takuya Hasegawa, Yusuke Asakura, Teruki Motohashi Shu Yin

    7th International Solvothermal and Hydrothermal Association Conference (ISHA2021)  2021.10.27 

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  77. The Effect of Synthesis Temperature on the Formed Polymorphs of Halogen-doped Vanadium Dioxide (X: Cl, Br, I) for Smart Windows Application International conference

    Anung Riapanitra, Yusuke Asakura, Shu Yin

    6th International Solvothermal and Hydrothermal Association Conference (ISHA2018)  2018.8.8 

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  78. Toluene gas sensing performance of micro-/mesoporous SnO2 spheres synthesized in organic solvent

    Hermawan Angga, Asakura Yusuke, Inada Miki, Yin Shu

    日本セラミックス協会2019年年会  2019.3.26 

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  79. Topotactic Conversion of Layered Silicate RUB-15to Sodalite through Interlayer Condensation International conference

    Masakazu Koike, Yusuke Asakura, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda

    International Symposium on Zeolites and Microporous Crystals 2018 (ZMPC2018)  2018.8.9 

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  80. Topotactic Morphological Control of Nitrides/Oxynitrides by Hydrothermal Assisted Nitridation Process

    Angga Hermawan, Yusuke Asakura, Takuya Hasegawa, Shu Yin

    7th International Solvothermal and Hydrothermal Association Conference (ISHA2021)  2021.10.27 

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  81. Tuning Structure and Electronic Properties of MoS2-xSex Nanolayer for Improved NO Detection at Room Temperature

    Ardiansyah Taufik, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    International Symposium on Functional Materials, The 8th ICMAP & The 9th ISFM  2021.1.19 

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  82. Tuning structure of MoS2-xSex nanoparticle for improving NO detection at room temperature

    Ardiansyah Taufik, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    7th International Solvothermal and Hydrothermal Association Conference (ISHA2021)  2021.10.27 

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  83. Utility of Oxide Nanoparticles for Morphological Control of Wurtzite Oxynitrides Invited International conference

    ASAKURA, Yusuke, YIN, Shu

    The 13th Pacific Rim Conference on Ceraminc Societies (PACRIM13)  2019.10.29 

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  84. MXenesから誘導した2D層状炭窒化チタンのその場トポタクチック合成とその優れたH2ガス検知性能

    張彪, 朱建锋, 朝倉裕介, ヘルマワンアンガ, 殷澍

    日本セラミックス協会2019年年会  2019.3.26 

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  85. Synthesis of Nanostructured Nitrides by Nitridation of Precursors Designed Precisely Invited International conference

    Yusuke Asakura, Shu Yin

    2019 International Conference on Nanospace Materials (ICNM 2019)  2019.10.4 

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  86. Synthesis of N-doped La2Ti2O7 and LaTiO2N with nanocrystalline morphology and their phootcatalytic NOx oxidation acitvity

    Jingwen Wang, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    日本セラミックス協会 第33回秋季シンポジウム  2020.9.4 

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  87. Synthesis of Morphology-controlled (Zn1+xGe)(N2Ox) Solid Solutions with Enhanced Photocatalytic Activity for NOx Decomposition International conference

    J. Wang, Y. Asakura, S. Yin

    TU-USTB Joint Symposium  2019.5.16 

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  88. Synthesis of Morphology Controllable Zinc Oxide Powders / Films and their Novel Applications International conference

    S. Yin, Y. Nishimura, Y. Asakura, A. Sumiyoshi, A. Oyama, T. Kumei

    The 8th Advanced Functional Materials and Devices (AFMD2018)  2018.8.17 

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  89. Synthesis of ion doped tungsten suboxide(W18O49)containing PDMS film and its NIR shielding property

    Hanyu Liu, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    第60回 セラミックス基礎科学討論会  2022.1.8 

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  90. Synthesis of Gallium Oxynitride nanoparticles with Visible-Light Photocatalytic Activity through Hydrothermal Reaction under a Presence of Acetylene Black Invited International conference

    Yusuke Asakura, Shu Yin

    19th International Symposium on Eco-Materials Processing and Design  2018.2.19 

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  91. Synthesis of CuO decorated-SnO2 microsphere for p-n type gas sensor application

    Angga Hermawan, Yusuke Asakura, Shu Yin

    平成30年度 化学系学協会東北大会  2018 

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  92. Synthesis of Composite Materials with Enhanced Photocatalytic DeNOx Activity and Infrared Light Shielding Property International conference

    Shu Yin, Yusuke Asakura

    The 20th International Symposium on Eco-Materials Processing and Design (ISEPD2019)  2019.1.5 

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  93. Synthesis of B and N Co-doped Anatase, Rutile and Brookite TiO2 with Diverse Characteristic Optical Properties

    Jingdi Cao, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    第59回 セラミックス基礎科学討論会  2021.1.7 

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  94. Synthesis of Anion doped Titania Based Nanocomposites with Enhanced deNOx Photocatalytic Activity International conference

    S.Yin, S.Komatsuda, Y.Asakura. J.Vequizo, A. Yamakata

    The 10th International Symposium on Integrated Molecular / Materials Science and Engineering ( IMSE-10 )  2019.7 

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  95. Synthesis and Photocatalytic Characterization of (Ta,N) Doped TiO2 with Unique Morphology by WCRSP Process International conference

    S. Yin, M. Nakamura, Y. Anada, Y. Asakura, K. Imanawa, T. Sato

    The 8th International Symposium on Functional Materials (ISFM 2018)  2018.8.20 

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  96. Synthesis and morphology control of BiVO4 photocatalyst using organic-aqueous colloidal reaction

    半谷泰生, 長谷川拓哉, 朝倉裕介, 殷シュウ

    2021年度化学系学協会東北大会  2021.10.2 

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  97. Synthesis and evaluation of oxygen storage capacity (OSC) of YMnO3 nanoparticles International conference

    OTOMO, Mayu, MIYAKE, Amiko, ASAKURA, Yusuke, YIN, Shu

    The 13th Pacific Rim Conference on Ceraminc Societies (PACRIM13)  2019.10 

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  98. Synthesis and Characterization of VO2 Based Thermochromic and Multifunctional Materials

    Anung Riapanitra, Yusuke Asakura, Shu Yin

    第57回セラミックス基礎科学討論会  2019.1.16 

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  99. Synthesis and Characterization of Morphology Controllable Zinc Oxide Micron Pparticles International conference

    Y. Nishimura, Y. Asakura, A. Sumiyoshi, A. Oyama, T. Kumei, S. Yin

    Tohoku University’s Chemistry Summer School 2018  2018.8.27 

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  100. Synthesis and Characterization of Morphology Controllable Nitride Based Materials International conference

    S. Yin, A. Hermawan, Y. Asakura

    TU-USTB Joint Symposium  2019.5.16 

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  101. Synthesis and Characterization of High Sensitive Photocatalysts for deNOx Applications International conference

    Shu Yin, Yusuke Asakura, Kenichi Katsumata

    19th International Symposium on Eco-Materials Processing and Design  2018.2.19 

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  102. Synthesis and Characterization of GaN:ZnO Film for Blue-light Cut Filter International conference

    Yukiho Nishimura, Yusuke Asakura, Shu Yin

    The 5th International Conference on Advanced Electromaterials (ICAE 2019)  2019.11 

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  103. Structure Modification of MoS2 by Selenium Doping for NO Detection Devices

    Ardiansyah Taufik, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    第59回 セラミックス基礎科学討論会  2021.1.7 

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  104. Solvothermal Synthesis of Tungsten and Vanadium Based Oxides for Infrared Light Shielding International conference

    RIAPANITRA, Anung, ASAKURA, Yusuke, YIN, Shu

    The 13th Pacific Rim Conference on Ceraminc Societies (PACRIM13)  2019.10 

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  105. Solvothermal synthesis of micro-/mesoporous SnO2 spheres and their toluene gas sensing properties

    Angga Hermawan, Yusuke Asakura, Miki Inada, Shu Yin

    無機マテリアル学会第138回講演会  2019.6.7 

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  106. Solvothermal synthesis of ion doped tungsten suboxide and its optical property

    劉涵宇, 長谷川拓哉, 朝倉裕介, 殷シュウ

    2021年度化学系学協会東北大会  2021.10.2 

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  107. Solvothermal Synthesis of Anion doped Vanadium Dioxide with Excellent Thermochromic Properties International conference

    A. Riapanitra, Y. Asakura, S.YIN

    12th International Conference on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE 2018)  2018.7.22 

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  108. Soft-chemical synthesis of infrared light shielding smart window materials

    殷澍, 朝倉裕介, 長谷川拓哉

    令和2年度化学系学協会東北大会  2020.9.27 

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  109. Reductant-Free Synthesis of Oxygen Vacancies-Mediated TiO2 Nanocrystals with Enhanced Photocatalytic NO Removal Performance

    Zhanyong Gu, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    International Symposium on Functional Materials, The 8th ICMAP & The 9th ISFM  2021.1.19 

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  110. Preparation of a thick film GaN for hydrogen gas sensor application

    Angga Hermawan, Yusuke Asakura, Shu Yin

    日本セラミックス協会 2018年年会  2018.3.15 

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  111. Photocatalytic Activities of Carbon-doped TiO2 Based Composites International conference

    Chiaki Noda, Yusuke Asakura, Shu Yin

    14th International Ceramics Congress  2018.6.4 

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  112. One-Step Hydrothermal Synthesis and Temperature Effect of Thermochromic Halogen-doped Vanadium Dioxide Nanoparticles

    Anung Riapanitra, Yusuke Asakura, Shu Yin

    日本セラミックス協会 第30回秋季シンポジウム第31回秋季シンポジウム  2018.9.2 

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  113. Novel Solvothermal Synthesis of Environmental Responsive Inrganic Functional Materials International conference

    Shu Yin, Yusuke Asakura

    International Conference on Functional Materials(ICFM2018)  2018.9.15 

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  114. New synthetic route for MoN from NaMoO3F obtained solvothermally International conference

    Yusuke Asakura, Shu Yin

    The 5th International Conference on Advanced Electromaterials (ICAE 2019)  2019.11 

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KAKENHI (Grants-in-Aid for Scientific Research) 4

  1. Tailor-made synthesis of hollow transition metal oxide nanoparticles by using water-soluble sacrificing templates

    Grant number:23K04894  2023.4 - 2026.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship:Principal investigator 

    Grant amount:\4810000 ( Direct Cost: \3700000 、 Indirect Cost:\1110000 )

  2. Creation and construction of basic technologies of indium-free functional nanomaterials for smart windows

    Grant number:20H00297  2020.4 - 2025.3

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

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    Authorship:Coinvestigator(s) 

  3. Synthesis of metal nitrides from metal fluorides/oxyfluorides and their electrocatalytic activity

    Grant number:20K15361  2020.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Asakura Yusuke

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    Authorship:Principal investigator 

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    In this study, metal nitrides were synthesized by using alkaline transition metal oxyfluorides as a precursor through nitridation, and the electrocatalytic activities of the obtained nitrides were investigated. The synthetic route of molybdenum nitrides from sodium molybdenum oxyfluorides led to high distribution of cobalt dopants in the obtained nitrides to exhibit higher oxygen reduction reaction catalytic activity than that obtained by conventional methods. This indicates the merit of metal oxyfluorides as a precursor for nitrides. Also, new solvothermal system for the synthesis of alkaline transition metal oxyfluorides was developed, and several oxyfluorides were successfully synthesized by reaction of MoO3 or WO3 with alkaline fluorides.

  4. Morphological control of (oxy)nitrides by using topotactic reactions for photocatalytic application

    Grant number:17K14542  2017.4 - 2020.3

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

    Asakura Yusuke

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    Authorship:Principal investigator 

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    In this study, morphological control methods for oxynitrides were developed to improve photocatalytic activity. Oxynitrides are generally synthesized by nitridation of oxides. We have focused on the oxynitride formations in which the morphology of the precursor oxides is retained after the nitridation. Several kinds of oxynitrides with controlled morphology were successfully synthesized by tailoring the oxide morphology and subsequently retaining the morphology after nitridation. In some cases, not only morphology but also crystal structure of the oxynitrides reflected those of the precursor oxides. Such nitridation was called as topotactic nitridation. Some of the morphologically controlled oxynitrides possessed higher photocatalytic activity compared with that of the oxynitrides obtained by the previous method, suggesting the morphological control of oxynitrides is effective for improvement of photocatalytic activity.