Updated on 2021/10/25

写真a

 
YAGI Shinya
 
Organization
Institute of Materials and Systems for Sustainability Advanced Measurement Technology Center (AMTC) X-Ray Spectroscopy Section Professor
Graduate School
Graduate School of Engineering
Title
Professor
Contact information
メールアドレス

Degree 1

  1. Doctor of Science ( 1995.3   Hiroshima University ) 

Research Interests 5

  1. Nanoparticle

  2. Vulcanized rubber

  3. エネルギー学一般

  4. 光物性

  5. 大気汚染

Research Areas 4

  1. Others / Others  / Surface Physics

  2. Others / Others  / Solid‐State Physics I (Optical Properties, Semiconductor and Dielectrics)

  3. Others / Others  / Engineering@Material Engineering@Composed Materials and Properties

  4. Others / Others  / Interdisciprinary Area@Energy@Energy Science General

Current Research Project and SDGs 10

  1. Structural study of molecular adsorption system on transition metal surface by synchrotron radiation light.

  2. Study on hydrogen storage alloy materials

  3. Study on adsorption reaction of bio-molecules under water environment by soft X-ray Synchrotron Light

  4. Detection of bio-gas and application of medical field

  5. 異種金属原子で修飾された金属単結晶表面における分子吸着構造の研究

  6. Adsorption behavior of a sulfur-containing amino acid on solid surface.

  7. 超微粒子材料(ナノ材料)を用いた新機能材料に関する研究

  8. 白金系金属超微粒子を利用した排ガス浄化触媒の高効率化に関する研究

  9. ナノオーダーの新規構造を有する機能材料を用いた触媒の研究

  10. 加硫ゴム材料中における架橋反応に関する研究

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Research History 15

  1. Nagoya University   Institute of Materials and Systems for Sustainability   Professor

    2015.10

  2. Nagoya University   Ecotopia Science Institute, Division of Green Conversion

    2014.4 - 2015.10

  3. 名古屋大学エコトピア科学研究所 環境システム・リサイクル科学研究部門・教授

    2012.4 - 2014.3

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    Country:Japan

  4. 愛知県知の拠点 あいちシンクロトロン光センター・協力教員

    2011.4

  5. 立命館大学SRセンター・客員研究員

    2010.4

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    Country:Japan

  6. 愛知県産業技術研究所・客員研究員

    2007.4

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    Country:Japan

  7. 名古屋大学大学院工学研究科量子工学専攻・准教授

    2007.4 - 2012.3

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    Country:Japan

  8. 名古屋大学大学院工学研究科量子工学専攻・助教授

    2004.4 - 2007.3

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    Country:Japan

  9. JST成果活用プラザ広島「谷口・マツダプロジェクト」主任研究員

    2002.10 - 2005.9

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    Country:Japan

  10. 広島大学 放射光科学研究センター 客員研究員

    2000.4

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    Country:Japan

  11. Hiroshima University   Hiroshima Synchrotron Radiation Center

    2000.4

  12. 名古屋大学大学院工学研究科結晶材料工学専攻・助教授

    2000.4 - 2004.3

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    Country:Japan

  13. 広島大学放射光科学研究センター・助手

    1996.5 - 2000.3

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    Country:Japan

  14. 広島大学大学院理学研究科・助手

    1996.4 - 1996.5

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    Country:Japan

  15. 岡崎国立共同研究機構 分子科学研究所・極端紫外光実験施設非常勤研究員(IMSフェロー)

    1995.4 - 1996.3

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    Country:Japan

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Education 2

  1. Hiroshima University   Graduate School, Division of Natural Science   Materials Science

    - 1995

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    Country: Japan

  2. Hiroshima University   Faculty of Science   Department of Materials Science

    - 1990

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    Country: Japan

Professional Memberships 14

  1. 日本物理学会   東海支部委員

    2004.4

  2. 日本放射光学会   行事委員(2005-2006), 組織委員(2008)

  3. 触媒学会

  4. 日本原子力学会   中部支部常任幹事

    2002.4 - 2004.3

  5. AVS

  6. ナノ・バイオメディカル学会   大会委員長(2014年度開催大会)

    2013.4

  7. 日本表面学会

  8. 日本同位体学会

  9. Society of Rubber Science and Technology, Japan

  10. 触媒学会

  11. 日本表面学会

  12. 日本同位体学会

  13. 日本原子力学会

  14. AVS

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Papers 123

  1. Undulators at HiSOR - a compact racetrack-type ring Reviewed

    Atsunari Hiraya, Katsuhide Yoshida, Shinya Yagi, Masaki Taniguchi, Shin-ichi Kimura, Hiroyuki Hama, Takeshi Takayama and Daizo Amano

    J. Synchrotron Rad.   Vol. 5   page: 445-447   1998

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

  2. Molecular adsorption of CH3CN and C5H5N on Si(111)7x7

    J. Vacuum Sci. Technol.   Vol. A18   page: 2578-2581   2000

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

  3. Studies of Aniline on Si(111)7x7 Surface by a Scanning Tunneling Microscopy

    J. Vacuum Sci. Technol.   Vol. B18   page: 2335-2339   2000

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

  4. Structural study of C5H5N on Si(111)-(7x7)

    Surface Science   Vol. 454-456   page: 157   2000

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

  5. Molecular Adsorption of (CH3)2S on Ni(100) Studied by S K-Edge NEXAFS and XPS Reviewed

    S. Yagi, A. Matano, G. Kutluk, N. Shirota, E. Hashimoto and M. Taniguchi

    Surface Science   Vol. 482-485   page: 73-76   2001

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

  6. Design and performance of a soft x-ray double crystal monochromator in HSRC Reviewed

    S. Yagi, G. Kutluk, T. Matsui, A. Matano, A. Hiraya, E. Hashimoto and M. Taniguchi

    Nucl. Inst. and Methods A   Vol. 467-468   page: 723-726   2001

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  7. High-resolution photoelectron spectroscopy of Heusler-type Fe2Val alloy Reviewed

    . K. Soda, T. Mizutani, O. Yoshimoto, S. Yagi, U. Mizutani, H. Sumi, Y. Nishino, Y. Yamada, T. Yokoya, S. Shin, A. Sekiyama and S. Suga

    J. Synchrotron Rad.   Vol. 9   page: 233-236   2002

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  8. Structural Study on (CH3)2S/Cu(100) by Near Edge X-ray Absorption Fine Structure and X-ray Photoelectron Spectroscopy Reviewed

    S. Yagi, Y. Nakano, E. Ikenaga, S. A. Sardar, J. A. Syed, K. Soda, E. Hashimoto, K. Tanaka and M. Taniguchi

    Journal of Vacuum Science and Technology A   Vol. 20   page: 1644-1646   2002

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  9. Core-level photoelectron study of Si(111) r7xr3-(Pb, Sn) surface Reviewed

    Kazuo Soda, Junji Yuhara, Takashi Takada, Osamu Yoshimoto, Masahiko Kato, Shinya Yagi, Kenji Morita, Masao Kamada

    Nuclear Instruments and Methods in Physics Research Section B   Vol. 199   page: 416-421   2003

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  10. Orientation and charge transfer upon adsorption of ethanethiol on Cu(1 1 1) surface at 85K Reviewed

    S. A. Sardar, J. A. Syed, E. Ikenaga, S. Yagi, T. Sekitani, S. Wada, M. Taniguchi and K. Tanaka

    Nuclear Instruments and Methods in Physics Research Section B   Vol. 199   page: 240-243   2003

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  11. Adsorption Behavior of Sulfur-Containing Amino Acid Molecule on Transition Surface Studied by S K-edge NEXAFS Reviewed

    S. Yagi, Y. Matsumura, Y. Nakano, E. Ikenaga, S. A. Sardar, J. A. Syed, K. Soda, E. Hashimoto, K. Tanaka and M. Taniguchi

    Nuclear Instruments and Methods in Physics Research Section B   Vol. 199   page: 244-248   2003

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  12. Molecular adsorption of (CH3)2S on Ag(111) Studied by S K-edge XAFS and XPS Reviewed

    Shinya Yagi, Yoshihiro Nakano, Eiji Ikenaga, Saydul A. Sardar, Jamal. A. Syed, KenichiroTanaka, Eiji Hashimoto and Masaki Taniguchi

    Surface Science   Vol. 566-568   page: 746-750   2004

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  13. Interface Study for Liquid-Solid State Surface by means of S K-edge NEXAFS Method Reviewed

    Yagi, S. Matsumura, Y. Soda, K. Hashimoto, E. Taniguchi, M.

    Surface and Interface Analysis   Vol. 36   page: 1064-1067   2004

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  14. *軟X線領域における大気圧条件XAFSシステム

    八木伸也

    放射光(日本放射光学会誌)   Vol. 18   page: 316-320   2005

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    Authorship:Lead author   Language:Japanese  

  15. Adsorption behavior of (CH3)2S on Rh(100) studied by S K-edge NEXAFS and XPS Reviewed

    T. Nomoto, S. Yagi, G. Kutluk, K. Soda, E. Hashimoto and M. Taniguchi

    Journal of Surface Analysis   Vol. 12   page: 238-243   2005

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  16. Adsorption of (CH3)2S on c(10×2)Ag/Cu(100) studied by S K-edge NEXAFS and XPS Reviewed

    Shinya Yagi, Yoshihiro Nakano, Eiji Ikenaga, Ghalif Kutluk, Saydul A. Sardar, Jamal. A. Syed, Kenichiro Tanaka, Eiji Hashimoto and Masaki Taniguchi

    Journal of Surface Analysis   Vol. 12   page: 232-237   2005

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  17. Surface reaction of (CH3)2S on Rh nanohole surface Reviewed

    S. Yagi, T. Nomoto, G. Kutluk, H. Sumida, H. Namatame, M. Taniguchi and K. Soda

    Reviews on Advanced Materials Science   Vol. 10   page: 277-282   2005

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  18. Fabrication and characterization of Pd Nanoparticle Reviewed

    S. Yagi, H. Sumida, K. Miura, T. Nomoto, K. Soda, G. Kutluk, H. Namatame, M. Taniguchi

    e-Journal of Surface Science and Nanotechnology   Vol. 4   page: 258-262   2006

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  19. Adsorption Behavior of (CH3)2S on sputtered and annealed Rh(100) surface by AFM, XPS and NEXAFS Reviewed

    T.Nomoto, S.Yagi, K.Soda, G.Kutluk, H.Sumida, E.Hashimoto, and M.Taniguchi

    e-Journal of Surface Science and Nanotechnology   Vol. 4   page: 39-45   2006

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  20. Thermal stability of supported noble metal nanoclusters Reviewed

    Kutluk, G., Yagi, S., Sumida, H., Namatame, H., Taniguchi, M.

    Materials Research Society Symposium Proceedings   Vol. 915   page: 121-127   2006

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  21. Nagoya university photo-science nanofactory project Reviewed

    Takashima, Y., Yamane, T., Takeda, Y., Soda, K., Yagi, S., Takeuchi, T., Akimoto, K., (...), Katoh, M.

    AIP Conference Proceedings   Vol. 879   page: 75-78   2007

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  22. XAFS Measurement System for Nano, Bio and Catalytic Materials in Soft X-ray Energy Region Reviewed

    Shinya Yagi, Toyokazu Nomoto, Takaki Ashida, Kazuya Miura, Kazuo Soda, Kazue Yamagishi, Noriyasu Hosoya, Ghalif Kutluk, Hirofumi Namatame and Masaki Taniguchi

    AIP Conference Proceedings   Vol. 879   page: 1638-1641   2007

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  23. Liquid–solid interface of L-cysteine/TM (TM = Ni and Cu) in aqueous solution by means of sulfur K-edge NEXAFS Reviewed

    S. Yagi, Y. Matsumura, T. Nomoto, K. Soda, E. Hashimoto, H. Namatame and M. Taniguchi

    Surface Science   Vol. 601   page: 4154-4157   2007

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  24. Synthesis and characterization of Rh(PVP) nanoparticles studied by XPS and NEXAFS Reviewed

    T. Ashida, K. Miura, T. Nomoto, S. Yagi, H. Sumida, G. Kutluk, K. Soda, H. Namatame and M. Taniguchi

    Surface Science   Vol. 601   page: 3898-3901   2007

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  25. Spectroscopic study on thermal reaction and desorption of sulfur/Rh(100) induced by oxygen-containing molecules Reviewed

    T. Nomoto, K. Miura, S. Yagi, G. Kutluk, H. Sumida, K. Soda, E. Hashimoto, H. Namatame and M. Taniguchi

    Surface Science   Vol. 601   page: 3784-3787   2007

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  26. Characterization of Pd(PVP) nanoparticles studied by AFM, Pd L3-edge and Cl K-edge NEXAFS Reviewed

    S. Yagi, T. Ashida, T. Nomoto, H. Namatame, M. Taniguchi

    Journal of Surface Analysis   Vol. 14   page: 444-448   2008

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  27. Coadsorption behavior of (CH3)2S with H2O or D2O on Rh(100) studied by XPS and NEXAFS, Journal of Surface Analysis Reviewed

    T. Nomoto, S. Yagi, K. Soda, H. Namatame and M. Taniguchi

    Journal of Surface Analysis   Vol. 14   page: 453-457   2008

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  28. Dissociation reaction of (CH3)2S adsorbed on Pd nanoparticles fabricated by gas evaporation method, Journal of Surface Analysis Reviewed

    M. Morihara, K. Miura, T. Nomoto and S. Yagi

    Journal of Surface Analysis   Vol. 14   page: 462-465   2008

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  29. Study of temperature dependence of Er nano structure on InP(001) Reviewed

    T.Mochizuki, S.Yagi, M.Kato, K.Soda, H. Namatame and M. Taniguchi

    Journal of Surface Analysis   Vol. 14   page: 449-452   2008

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  30. *Reaction of L-cysteine on Rh(PVP) nanoparticle surface in the aqueous environment studied by NEXAFS Reviewed

    S. Gohda, T. Ashida, Y. Sakurai, S. Yagi, H. Namatame, M. Taniguchi

    Journal of Surface Analysis   Vol. 14   page: 458-461   2008

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  31. Coadsorption reaction between (CH3)2S and H2O on Rh(100) studied by NEXAFS and XPS Reviewed

    T. Nomoto, O. Sumi, S. Yagi, K. Soda, H. Namatame and M. Taniguchi

    Surface and Interface Analysis   Vol. 40   page: 391-394   2008

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  32. Angle-resolved photoemission study on EuO thin films Reviewed

    H. Miyazaki, T. Ito, S. Ota, H.J. Im, S. Yagi, M. Kato, K. Soda, and S. Kimura

    Physica B   Vol. 403   page: 917   2008

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  33. Structural and Chemical State Changes in Rh on Al2O3/NiAl(100) Studied by NEXAFS, XPS and AFM Reviewed

    T. Nomoto, S. Yagi, K. Soda, H. Namatame, M. Taniguchi

    e-J. Surf. Sci. Nanotech.   Vol. 7   page: 65-69   2009

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  34. Single Crystalline Growth and Magnetic, Optical and Photoelectrical Properties of EuO Thin Films Reviewed

    H. Miyazaki, T. Ito, H.J. Im, K. Terashima, S. Yagi, M. Kato, K. Soda, S. Kimura

    Japanese Journal of Applied Physics   Vol. 48   page: 055504   2009

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  35. *Adsorption and Removal Reactions of (CH3)2S on Rh/Al2O3/NiAl(100): Structural and Spectroscopic Study Reviewed

    T. Nomoto, S. Yagi, K. Soda, H. Namatame, and M. Taniguchi

    e-J. Surf. Sci. Nanotech.   Vol. 7   page: 239-244   2009

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  36. *In-Situ XPS Study on Adsorption Reaction of Dimethyl Sulfide on Pd Nanoparticle Surface Reviewed

    M. Morihara, K. Miura, T. Nomoto, S. Yagi

    e-J. Surf. Sci. Nanotech.   Vol. 7   page: 298-300   2009

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  37. Spectroscopic Study on the Reaction of L-Cysteine in Rh(PVP) Nanoparticle Colloidal Solution Reviewed

    S. Gohda, T. Ashida, S. Yagi, K. Matsuo, H. Namatame, and M. Taniguchi

    e-J. Surf. Sci. Nanotech.   Vol. 7   page: 314-318   2009

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  38. IN-SITU XPS STUDY OF Pd NANOPARTICLE FABRICATED BY GAS EVAPORATION METHOD Reviewed

    K. MIURA, M. MORIHARA, T. NOMOTO, S. YAGI, K. SODA, G. KUTLUK, H. NAMATAME, and M. TANIGUCHI

    Advances in Synchrotron Radiation   Vol. in press   2009

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  39. THERMALLY DEPENDENT ADSORPTION OF (CH3)2S ON OXYGEN PRE-COVERED Rh SURFACE STUDIED BY XPS AND NEXAFS Reviewed

    T. NOMOTO, S. YAGI, K. SODA, H. NAMATAME, and M. TANIGUCHI

    Advances in Synchrotron Radiation   Vol. in press   2009

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  40. Change of lattice constant due to the hybridization effect of a ferromagnetic semiconductor EuO Reviewed

    H. Miyazaki, T. Ito, H.J. Im, K. Terashima, T. Iizuka, S. Yagi, M. Kato, K. Soda, S. Kimura

    J. Phys.: Conf. Series.   Vol. in press   2010

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  41. Influence of CO2 and H2O on Air Oxidation of Mg Nanoparticles Studied by NEXAFS Reviewed

    S. Ogawa, H. Niwa, K. Nakanishi, T. Ohta and S. Yagi

    Journal of Surface Analysis   Vol. 17   page: 319-323   2011

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  42. Aggregation mechanism of Pd nanoparticles in l-cysteine aqueous solution studied by NEXAFS and AFM Reviewed

    C. Tsukada, S. Ogawa, T. Mizutani, G. Kutluk, H. Namatame, M. Taniguchi, S. Yagi

    Appl. Surf. Sci.   Vol. 262   page: 184-187   2012

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  43. Adsorption behavior of l-cysteine on Ag nanoparticles under water environment studied by S K-edge NEXAFS Reviewed

    C. Tsukada, S. Yagi, T. Nomoto, T. Mizutani, S. Ogawa, H. Nameki, Y. Nakanishi, G. Kutluk, H. Namatame, M. Taniguchi

    Appl. Surf. Sci.   Vol. 262   page: 231-233   2012

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  44. Spectral studies on sulfur poisoning of Pd/Mg6Ni by NEXAFS and XPS Reviewed

    S. Yagi, M. Nambu, C. Tsukada, S. Ogawa, G. Kutluk, H. Namatame, M. Taniguchi

    Appl. Surf. Sci.   Vol. 267   page: 45-47   2013

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  45. Morphological and spectroscopic studies on enlargement of Pd anoparticle in l-cysteine aqueous solution by AFM and XPS Reviewed

    C. Tsukada, S. Ogawa, H. Niwa, T. Nomoto, G. Kutluk, H. Namatame, M. Taniguchi, S. Yagi

    Appl. Surf. Sci.   Vol. 267   page: 48-52   2014

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  46. XAFS and XPS study of hydro-/dehydrogenation reaction of Mg-Pd nanoparticles Reviewed

    S. Ogawa, T. Fujimoto, T. Mizutani, M. Ogawa, C. Yogi, K. Kato, T. Ohta, T. Yoshida and S. Yagi

    Surf. Interface Anal.   Vol. 46   page: 1143-1146   2014

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  47. 金属ナノ粒子を用いた水素吸蔵材料の分光学的手法による化学状態分析 Reviewed

    小川智史,内山直樹,藤本大志,金井友美,八木伸也

    日本金属学会誌   Vol. 79 ( 3 ) page: 118-123   2015

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  48. Vulcanization reaction of squalene and S8 powder studied by Sulfur K-edge NEXAFS under liquid phase Reviewed

    S. Yagi, Y. Menjo, C. Tsukada, S. Ogawa, G. Kutluk, H. Namatame, M. Taniguchi

    IOP Conference Series: Materials Science and Engineering   Vol. 76   page: 0120004   2015

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    DOI: 10.1088/1757-899X76/1/012004

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

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

    INTERNATIONAL CONFERENCE ON SOLID FILMS AND SURFACES (ICSFS 2014)   Vol. 76 ( 1 ) page: 012001   2015

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    The gold nanoparticles (Au NPs) colloidal solution and the phosphatidylcholine (PC) liposome aqueous solution are fabricated by the solution plasma method and the extrusion procedure, respectively. When the Au NPs colloidal solution and the PC liposome aqueous solution are mixed, considering the TEM image, we think that the Au NPs firstly are covered with the PC molecules, which do not contribute to form the PC liposome, and subsequently the Au NPs covered with the PC adsorb on the PC liposome surface. We propose that the PC molecule adsorbs on the Au sheet surface at the methyl group of N-CH3 and the oxygen atoms of P-O, P=O, C-O and C=O bonds, because each peak intensity of N, O and P K-edges NEXAFS spectra for the PC/Au sheet is reduced in comparison with that for the PC multilayer. Furthermore, the Au NPs covered with PC seem to be aggregated each other through the hydrophobic groups of PC on Au NPs.

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

    Web of Science

    Scopus

  50. Preparation of silver-decorated Soluplus (R) nanoparticles and antibacterial activity towards S. epidermidis biofilms as characterized by STEM-CL spectroscopy

    Takahashi Chisato, Yamada Tomomi, Yagi Shinya, Murai Takaaki, Muto Shunsuke

    MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS   Vol. 121   2021.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Materials Science and Engineering C  

    Biofilm infections present a serious problem because antibacterial drugs are not effective against mature biofilms or biofilms formed by drug-resistant bacteria. To address this issue, we developed a drug delivery system based on metal-decorated polymeric particles. Polyvinyl caprolactam–polyvinyl acetate–polyethylene glycol graft copolymer (Soluplus®) is an amphiphilic polymer used in biomedical formulations, while silver nanoparticles are widely acknowledged to have high antibacterial activity. We prepared silver-decorated Soluplus® micelle nanoparticles with high antibacterial activity using the emulsion solvent diffusion method. Decoration of Soluplus® micelles with silver nanoparticles was found to increase their antibacterial activity. Scanning transmission electron microscopy-cathodoluminescence (STEM-CL) spectroscopy allows imaging of the spatial distribution of labeled targets and the chemical identification of materials. However, STEM-CL spectroscopy of fragile polymer materials is challenging. We optimized the STEM-CL spectroscopy technique to determine the distribution of silver nanoparticles in Soluplus® micelles. Additionally, the surface plasmon properties of the silver nanoparticles were successfully characterized without deactivation. The developed silver-decorated Soluplus® nanoparticles were effective against biofilm infections and have the potential to be applied for other biofilm-related diseases. Additionally, the optimized STEM-CL spectroscopy technique is expected to contribute to the analysis and imaging of fragile polymer materials, as well as other soft materials such as cells and tissues.

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  51. Preparation of silver-decorated Soluplus® nanoparticles and antibacterial activity towards S. epidermidis biofilms as characterized by STEM-CL spectroscopy Reviewed

    Chisato Takahashi, Tomomi Yamada, Shinya Yagi, Takaaki Murai, Shunsuke Muto

    Materials Science & Engineering C   Vol. 121   page: 11718 - 11724   2021.2

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  52. Quantitative Analysis of Crosslinked Structure in Rubber Materials by Sulfur K-edge NEXAFS

    Shirode Kensuke, Kawai Hitoshi, Oe Hiroaki, Nakamura Norihiko, Yagi Shinya

    E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY   Vol. 18 ( 0 ) page: 262 - 267   2020.8

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    Quantitative analysis of crosslinked structure in vulcanized rubber is not enough. There have been some methods based on mechanical properties but no methods to obtain only information on the crosslinked structure. We have solved that problem by curve fitting of sulfur K-edge near-edge X-ray absorption fine structure (NEXAFS) spectra. NEXAFS is useful to determine the chemical structure of the target element. The crosslinked structure obtained by NEXAFS shows a high correlation with the orthodox method. We have established the useful method to assist the orthodox analysis results. We have clarified the relationship between heat resistance of rubber materials and crosslinked structure using NEXAFS in this study.

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  53. Quantitative Analysis of Crosslinked Structure in Rubber Materials by Sulfur K-edge NEXAFS Reviewed International journal

    Shirode Kensuke, Kawai Hitoshi, Oe Hiroaki, Nakamura Norihiko, Yagi Shinya

    E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY   Vol. 18   page: 262 - 267   2020.8

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    DOI: 10.1380/ejssnt.2020.262

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

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

    CATALYSIS TODAY   Vol. 352   page: 34 - 38   2020.8

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    We have succeeded to prepare Au nanopareticle deposited TiO2 photocatalysts (Au/TiO2) with control of Au nanoparticle size to be around 8 nm and variation of number density using a colloid photodepostion method. The prepared Au/TiO2 exhibits activity on decomposition (oxidation) of formic acid by thermally activated and photo-activated catalytic reactions. The thermally activated catalytic decomposition gradually increases with increasing the number density of deposited Au NPs and saturated, suggesting that the decomposition occurs on Au NPs surface and/or near the interface of TiO2 and Au NPs. On the other hand, the photocatalytic decomposition is significantly improved with rather small number density deposition of Au NPs and disappeared with high number density deposition. ESR measurements of Au/TiO2 in the surrounding similar to the photocatalytic decomposition suggests that electrons excited by plasmon resonance absorption in the Au NPs transfer to TiO2 to promote the decomposition. However, high number density deposition enhances electron capture by neighboring Au NPs and reduces the photocatalytic activity. Thus there should be the optimum number density of Au NPs on TiO2 for photocatalytic decomposition of formic acid.

    DOI: 10.1016/j.cattod.2019.12.035

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

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

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 22 ( 16 ) page: 8730 - 8738   2020.4

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    The photodeposition method is useful for the preparation of metal-loaded photocatalysts, by which the metal precursors are adsorbed on the photocatalyst surface and reduced by photoexcited electrons to typically form metallic nanoparticles. In the present study, the photodeposition process of Pt nanoparticles was investigated on anatase and rutile TiO2photocatalysts. It was found that on the anatase surface, only some of the Pt4+precursors were first adsorbed in an adsorption equilibrium and reduced to form a smaller number of initial metal species; then, they functioned as electron receivers to reduce the remaining precursors on their metallic surfaces and become larger particles. In contrast, the rutile surface can adsorb most of the precursors and quickly reduce them upon photoirradiation to form nanoparticles, giving a larger number of small nanoparticles. As a result, the Pt-loaded rutile photocatalyst exhibited higher activity in hydrogen evolution from an aqueous methanol solution than the Pt-loaded anatase photocatalyst.

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  56. Comparison of platinum photodeposition processes on two types of titanium dioxide photocatalysts Reviewed International journal

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

    Phys.Chem.Chem.Phys.   Vol. 22   page: 8730 - 8738   2020.3

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    DOI: 10.1039/c9cp06988g

  57. Ionic liquid-incorporated polymeric nanoparticles as carriers for prevention and at an earlier stage of periodontal disease

    Takahashi Chisato, Hattori Yuji, Yagi Shinya, Murai Takaaki, Tanemura Masaki, Kawashima Yoshiaki, Yamamoto Hiromitsu

    MATERIALIA   Vol. 8   2019.12

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    Periodontal diseases are refractory conditions due to difficulty of removal of biofilm and treating inflammation of periodontal region. We therefore focused on prevention of the periodontal diseases and treating at an earlier stage of the periodontal diseases using drug delivery system by removal of biofilm. In the present study, we developed a drug delivery system comprising ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) incorporated and chitosan-modified polymeric nanoparticles using base materials such as poly (DL-lactide-co-glycolide) (PLGA) and polyvinyl caprolactam – polyvinyl acetate – polyethylene glycol graft copolymer (Soluplus®, Sol). The physicochemical and antibacterial properties, cytotoxicity, morphology of the three types of IL-incorporated polymeric nanoparticles were examined. Additionally, retention ability in the periodontal tissue was determined for the case of treatment in the presence of saliva. Our results indicated that IL-incorporated and chitosan-modified Sol nanoparticles showed the highest antibacterial activity against biofilm bacterial cells, with low cytotoxicity. Electron microscopy imaging revealed that the three types of IL-incorporated and chitosan-modified polymeric nanoparticles had differing antibacterial activities in the micro- and nanoscale. Specifically, retention of polymeric nanoparticles in the periodontal tissue of mice was enhanced following IL incorporation. The use of IL for the preparation of polymeric nanoparticles effectively enhanced their antibacterial activity and retention effect, even in the absence of incorporated drug and can apply for prevention and early treatment of periodontal disease.

    DOI: 10.1016/j.mtla.2019.100395

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  58. Optimization of ionic liquid-incorporated PLGA nanoparticles for treatment of biofilm infections

    Takahashi Chisato, Hattori Yuji, Yagi Shinya, Murai Takaaki, Takai Chika, Ogawa Noriko, Tanemura Masaki, Fuji Masayoshi, Kawashima Yoshiaki, Yamamoto Hiromitsu

    MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS   Vol. 97   page: 78 - 83   2019.4

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    DOI: 10.1016/j.msec.2018.11.079

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  59. Development of sample preparation technique to characterize chemical structure of humin by synchrotron-radiation-based X-ray photoelectron spectroscopy

    Duyen Minh Pham, Miyata Yasushi, Awata Takanori, Nakatake Masashi, Zhang Chung Fang, Kanda Keiji, Ogawa Satoshi, Ohta Shozo, Yagi Shinya, Katayama Arata

    SURFACE AND INTERFACE ANALYSIS   Vol. 51 ( 2 ) page: 226 - 233   2019.2

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    DOI: 10.1002/sia.6574

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  60. Surface chemical states of gold nanoparticles prepared using the solution-plasma method in a CsCl aqueous solution

    Tsukada Chie, Yoshida Hikaru, Ogawa Satoshi, Yoshigoe Akitaka, Yagi Shinya, Yaita Tsuyoshi

    SURFACE AND INTERFACE ANALYSIS   Vol. 51 ( 1 ) page: 85 - 88   2019.1

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    DOI: 10.1002/sia.6555

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

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

    SURFACE AND INTERFACE ANALYSIS   Vol. 51 ( 1 ) page: 46 - 50   2019.1

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    DOI: 10.1002/sia.6543

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

    Muneaki Yamamoto, Shinya Yagi, Tomoko Yoshida

    Catalysis Today   Vol. 303   page: 334 - 340   2018.4

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    Ag species in the Ag loaded Ga2O3 (Ag/Ga2O3) photocatalysts were investigated with regard to changes in their structures and the chemical states before and after the photocatalytic CO2 reduction with water. Ag clusters with the size of around one nanometer in as prepared 0.1 wt% Ag/Ga2O3 sample became larger metallic Ag nanoparticles with the size of several nanometers after the reaction. In the 1.0 wt% Ag/Ga2O3 sample, Ag nanoparticles having the AgGaO2 interface structure decomposed to aggregated Ag metal particles after the reaction. Such transition in the morphology and chemical states of Ag species could explain the variations in photocatalytic activities of these samples during the reaction, and suggested that at least metallic Ag particles would function as effective co-catalysts. In-situ FT-IR measurements of the Ag/Ga2O3 samples before and after the reaction, we could not detect CO2 molecules adsorbing on metallic Ag nanoparticles in dark. Under light irradiation, however, the absorption bands originated from the photo-adsorbed CO2 species on Ag metal nanoparticles appeared. Thus, we detected the interaction of CO2 molecules and metallic Ag nanoparticles as the effective co-catalysts for CO2 reduction.

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

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

    Catalysis Today   Vol. 303   page: 320 - 326   2018.4

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    Silver nanoparticles (Ag NPs) were synthesized by a solution plasma method (SPM) in an aqueous solution of ammonia. Optical emission spectra of the plasma revealed that Ag NPs are fabricated with the sputtering of Ag rods as electrode by the produced energetic plasma particles such as H, OH and O radicals. In-situ optical absorption measurements of the solution during the discharge directly presented the concerted formation and aggregation processes of the Ag NPs, which controlled the size of Ag NPs. The synthesized Ag NPs were loaded on gallium oxide (Ga2O3) photocatalyst, and the photocatalytic activities of the obtained Ag loaded Ga2O3 (Ag/Ga2O3) samples were evaluated. Although the photocatalytic reaction proceeded over all the samples to produce CO, the CO production rates decreased with the reaction time. Measurements of DR UV–vis spectra and TEM images revealed that a part of the Ag NPs migrated and aggregated on the photocatalyst surface to become larger particles during the photocatalytic reaction, which would be related to the decrease of the photocatalytic activity. It was also found that the photoirradiation treatment on the prepared Ag/Ga2O3 sample before the use for the photocatalytic reaction improves the photocatalytic performance.

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  64. Robust Binding between Carbon Nitride Nanosheets and a Binuclear Ruthenium(II) Complex Enabling Durable, Selective CO2 Reduction under Visible Light in Aqueous Solution

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

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 56 ( 17 ) page: 4867 - 4871   2017.4

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    Carbon nitride nanosheets (NS-C3N4) were found to undergo robust binding with a binuclear ruthenium(II) complex (RuRu') even in basic aqueous solution. A hybrid material consisting of NS-C3N4 (further modified with nano-particulate Ag) and RuRu' promoted the photocatalytic reduction of CO2 to formate in aqueous media, in conjunction with high selectivity (approximately 98%) and a good turnover number (> 2000 with respect to the loaded Ru complex). These represent the highest values yet reported for a powder-based photocatalytic system during CO2 reduction under visible light in an aqueous environment. We also assessed the desorption of RuRu' from the Ag/C3N4 surface, a factor that can contribute to a loss of activity. It was determined that desorption is not induced by salt additives, pH changes, or photoirradiation, which partly explains the high photocatalytic performance of this material.

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  65. Au nanorods fabricated by means of solution plasma method

    Tsukada Chie, Mizutani Tsuyoshi, Ogawa Satoshi, Nameki Hirofumi, Yagi Shinya

    SURFACE AND INTERFACE ANALYSIS   Vol. 48 ( 11 ) page: 1248 - 1251   2016.11

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    Au nanorods with a low toxicity are important in medical field. The nanorods are generally fabricated by using cetyltrimethylammonium bromide (CTAB), which has a high toxicity. We have attempted the fabrication of Au nanorods without CTAB reagent. In this study, Au nanoparticles as growth seeds of the nanorods have been fabricated by using Au rods and NaCl aqueous solution. Subsequently, Au3+ ions of HAuCl4 have been reduced in the mixing solution, which includes the Au nanoparticles and the NaCl aqueous solution, by means of the solution plasma between W rods. The amount of Au3+ ion has been directly monitored during the solution plasma process by using in-situ UV–Vis-NIR. The fabricated solution possesses the Au nanoparticles of shapes of rod, sphere, triangle plate and hexagonal plate, respectively. The Au nanorods may be fabricated by both aggregating the reduced Au3+ ion at the surfaces of the Au nanoparticles as the growth seeds and controlling the growth orientation of the Au nanorods by the adsorption of Cl− ions on Au{100} facets. To control the narrow dispersion relation between the short and the long axes lengths of the Au nanorods, the addition of HAuCl4 aqueous solution in small volume steps is a key point. Copyright © 2016 John Wiley & Sons, Ltd.

    DOI: 10.1002/sia.6096

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

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

    E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY   Vol. 14 ( 0 ) page: 150 - 153   2016.5

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

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  67. Ag K- and L-3-edge XAFS study on Ag species in Ag/Ga2O3 photocatalysts

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

    16TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS16)   Vol. 712 ( 1 )   2016

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    Ag loaded Ga2O3 (Ag/Ga2O3) shows photocatalytic activity for reduction of CO2 with water. Ag L3-edge XANES and K-edge EXAFS spectra were measured for various Ag/Ga2O3 samples, which suggested that structural and chemical states of Ag species varied with the loading amount of Ag and the preparation method. The Ag species were metallic Ag particles with an AgGaO2-like interface structure in the sample with high loading amount of Ag while predominantly Ag metal clusters in the sample with low loading amount of Ag. The XANES feature just above the edge represented the interaction between the Ag species and the Ga2O3 surface, showing that the Ag metal clusters had more electrons in the d-orbitals by interacting with the Ga2O3 surface, which would contribute the high photocatalytic activity.

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  68. XAFS analysis for quantification of the gallium coordinations in Al2O3-supported Ga2O3 photocatalysts

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

    16TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS16)   Vol. 712 ( 1 )   2016

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    Ga2O3 loaded Al2O3 samples (Ga2O3/Al2O3) were prepared to change coordination structures around Ga atoms. Ga K-edge XANES spectra of the Ga2O3/Al2O3 samples showed two peaks assigned to Ga atoms having tetrahedral coordination structure (Ga(t)) and octahedral one (Ga(o)). Curve-fitting analysis of XANES spectra was carried out with a set of pseudo- Voight and arctangent functions, and the fractions of Ga(t) and Ga(o) were quantitatively estimated from the ratio of the peak areas. EXAFS curve-fitting analysis also evaluated the fractions of Ga(t) and Ga(o) and they were in good agreement with those obtained by XANES analysis. It was revealed that the fraction of Ga(t) increased with the decrease in the loading amount of Ga2O3 due to the interaction of Ga species with Al2O3. The fractions of Ga(t) and Ga(o) might relate to the photocatalytic activity for CO2 reduction with H2O over the Ga2O3/Al2O3 samples.

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  69. XAFS study on a photodeposition process of Pt nanoparticles on TiO2 photocatalyst

    Yoshida T., Minoura Y., Nakano Y., Yamamoto M., Yagi S., Yoshida H.

    16TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS16)   Vol. 712 ( 1 )   2016

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    A photodeposition process of Pt metal particles on anatase TiO2 in the aqueous solution of H2PtCl6 (precursor) and methanol (reductant) was studied using transmission electron microscopy, UV-vis spectroscopy and X-ray absorption fine structure spectroscopy. These analyses proposed the photodeposition mechanism of Pt on TiO2 by the photogenerated electrons: the photo-assisted adsorption of Pt4+ complexes on TiO2 through the ligand exchange at the initial stage, followed by the successive rapid reduction of Pt4+ to Pt0 to grow the Pt metal particles, which gives small and almost uniform size of Pt metal nanoparticles.

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

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

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS   Vol. 365   page: 79 - 81   2015.12

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    A nitrogen doped TiO2 as a visible-light response photocatalyst was prepared by N+ implantation technique. N+-implanted TiO2 samples promoted the photocatalytic activity for degradation of methylene blue under visible-light irradiation. XANES and XPS analyses indicated two types of chemical state of nitrogen, one photo-catalytically active N substituting the O sites and the other inactive NOx (1 ≤ x ≤ 2) species. In the valence band XPS spectrum of the high activity sample, the additional electronic states were observed just above the valence band edge of a TiO2. The electronic state would be originated from the substitutional nitrogen and be responsible for the band gap narrowing, i.e., visible light response of TiO2 photocatalysts.

    DOI: 10.1016/j.nimb.2015.04.010

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

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

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS   Vol. 365   page: 35 - 38   2015.12

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    We investigated the photocatalysis of dendritic nanostructured WO3/W composite materials fabricated by He plasma irradiation to tungsten plates, followed by the surface oxidation. The samples promoted the decolorization reaction of methylene blue (MB) aqueous solution under near infrared (NIR) light irradiation. To verify the MB molecule is actually decomposed by the photocatalysis of the samples, reaction products were analyzed by S K-edge XANES measurements for the MB solution kept with the samples under the light irradiation or in the dark. By the light irradiation, the σ∗(S-C) peak in the XANES spectra reduced and a new peak originated from SO42- species was clearly observed, suggesting that S-C bonds in a MB molecule are broken by the NIR light irradiation and finally the sulfur species exists in the solution in the state of SO42- ion. After the adsorption reaction in the dark, the XANES spectra of the sample surfaces showed a sharp π∗(S-C) peaks, indicating that MB molecules are adsorbed on the sample surfaces and stacked each other by the π-π interaction. These results demonstrate that the photocatalytic decomposition of MB molecules really proceeds over WO3/W composite materials even under NIR light irradiation.

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  72. In situ UV-vis investigation of growth of gold nanoparticles prepared by solution plasma sputtering in NaCl solution

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

    APPLIED SURFACE SCIENCE   Vol. 354   page: 397 - 400   2015.11

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    Gold nanoparticles are prepared in various concentrations of NaCl solutions by solution plasma sputtering. The absorption spectra of these solutions during and after the plasma process are measured by in situ ultraviolet-visible (UV-vis) spectroscopy to estimate the particle diameters and concentrations of gold. The distributions of particle diameters are obtained by transmission electron microscope (TEM) observations. These experiments indicate the gold nanoparticles with about 2.2 nm are directly formed by plasma phase and the diameters are increasing over time. These increases of particle diameters are caused by Ostwald ripening of gold nanoparticles in NaCl solution. We estimate the equilibrium diameter at which the gold nanoparticles are not solved in NaCl solution using in situ UV-vis spectroscopy. These diameters are about 5, 7 and 10 nm in 3, 5 and 10 mM NaCl solution, respectively. We make it possible to control the diameter of gold nanoparticles prepared by solution plasma sputtering in NaCl solution.

    DOI: 10.1016/j.apsusc.2015.04.139

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

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

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   Vol. 40 ( 35 ) page: 11895 - 11901   2015.9

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    The hydrogen storage property of the binary nanoparticles composed of Mg and Pd has been investigated by the QCM technique without the exposure to the air. The two types of nanoparticles have been fabricated by the gas evaporation method with the He gas. The one is the nanoparticles composed of the both Mg and Pd atoms (Mg-Pd NPs) and the other one is the composite of the Mg and Pd nanoparticles (Mg NPs-Pd NPs). Both the Mg-Pd NPs and the Mg NPs-Pd NPs can absorb the hydrogen under the room temperature and 1 atm of H2 gas. However, the desorptions of the hydrogen have not been observed about the both samples. We have also studied the chemical state of the NPs by XPS and XAFS. The XAFS analyses have revealed that the MgH2 in the NPs can not be dehydrogenated at the room temperature even if the catalytic effect of the Pd.

    DOI: 10.1016/j.ijhydene.2015.04.087

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

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

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   Vol. 40 ( 35 ) page: 11890 - 11894   2015.9

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    We have fabricated the materials composed of the Mg and the Ni nanoparticles and clarified the hydrogen storage property by using TEM, XPS and QCM. The Mg and the Ni nanoparticles have been fabricated by gas evaporation method and been mixed. The diameters of the Mg and the Ni nanoparticles have been estimated as 20.0 ± 8.4 and 4.7 ± 2.0 nm, respectively. And the Mg and the Ni nanoparticles as prepared sample possess almost clean surface. This sample can absorb the hydrogen under atmospheric pressure at 30 °C before completely oxidized. However, the hydrogen storage ability of this sample has been lost by the adsorption of residual gases even under vacuum condition in several hours after the end of fabrication. Due to the Mg oxide shell on the surface of the Mg nanoparticles is formed by the residual gases, the hydrogenation of the Mg nanoparticles are hindered.

    DOI: 10.1016/j.ijhydene.2015.05.031

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  75. The loading effect of silver nanoparticles prepared by impregnation and solution plasma methods on the photocatalysis of Ga2O3

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

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS   Vol. 359   page: 64 - 68   2015.9

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    Ag loaded Ga2O3 (Ag/Ga2O3) photocatalysts for the reduction of CO2 with water have been prepared by impregnation (IMP) and two types of solution plasma methods (SPM1 and SPM2). Using X-ray absorption near edge structure (XANES) and Fourier transform infrared (FT-IR) spectroscopies, we have investigated the local electronic structures of Ag/Ga2O3 photocatalysts as well as the adsorption behaviors of CO2 during the reaction. Both Ag L3-edge and O K-edge XANES analyses reveal the Ag-Ga2O3 interaction, i.e., the charge-transfer from O atoms to Ag atoms, by demonstrating the decrease in the unoccupied Ag 4d-state density and increase in the unoccupied O 2p-state density. The strength of the interaction depends on the preparation method, and increases in the order of Ag/Ga2O3 (SPM2), Ag/Ga2O3 (SPM1) and Ag/Ga2O3 (IMP). In addition, FT-IR measurements have disclosed that Ag/Ga2O3 (IMP) obtains a larger amount of strongly basic sites as a result of the strongest interaction between Ag and Ga2O3. Although the amount of the adsorbed CO2 is different in each Ag/Ga2O3 sample, in the following formation process of bidentate formate species, no remarkable difference is detected among all samples. The bidentate formate species are likely to interact with H2O molecules to produce CO under photoirradiation, and this process would be affected by the strength of the Ag-Ga2O3 interaction, because this reaction hardly proceeds over Ag/Ga2O3 (SPM2) having the weakest Ag-Ga2O3 interaction.

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

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

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   Vol. 447   page: 278 - 281   2015.6

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    The thickness-controlled TiO2 thin films are fabricated by the pulsed laser deposition (PLD) method. These samples function as photocatalysts under UV light irradiation and the reaction rate depends on the TiO2 thickness, i.e., with an increase of thickness, it increases to the maximum, followed by decreasing to be constant. Such variation of the reaction rate is fundamentally explained by the competitive production and annihilation processes of photogenerated electrons and holes in TiO2 films, and the optimum TiO2 thickness is estimated to be ca. 10nm. We also tried to dope nitrogen into the effective depth region (ca. 10nm) of TiO2 by an ion implantation technique. The nitrogen doped TiO2 enhanced photocatalytic activity under visible-light irradiation. XANES and XPS analyses indicated two types of chemical state of nitrogen, one photo-catalytically active N substituting the O sites and the other inactive NOx (1≤x≤2) species. In the valence band XPS spectrum of the high active sample, the additional electronic states were observed just above the valence band edge of a TiO2. The electronic state would be originated from the substituting nitrogen and be responsible for the band gap narrowing, i.e., visible light response of TiO2 photocatalysts.

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

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

    E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY   Vol. 13 ( 0 ) page: 343 - 346   2015

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

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  78. 金属ナノ粒子を用いた水素吸蔵材料の分光学的手法による化学状態分析 Reviewed

    小川智史, 内山直樹, 藤本大志, 金井友美, 八木伸也

    日本金属学会誌   Vol. 79 ( 3 ) page: 118-123   2015

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  79. Vulcanization reaction of squalene and S-8 powder studied by Sulfur K-edge NEXAFS under liquid phase

    Yagi S., Menjo Y., Tsukada C., Ogawa S., Kutluk G., Namatame H., Taniguchi M.

    INTERNATIONAL CONFERENCE ON SOLID FILMS AND SURFACES (ICSFS 2014)   Vol. 76 ( 1 )   2015

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    Vulcanized rubber materials are useful in our surroundings. However, detail structure and reaction are not revealed even in present. Since squalene molecule possesses some same properties compared with natural rubber, we have prepared the samples of vulcanized squalene at 140 ° C for several hours. To understand the vulcanization reaction,sulfur K-edge NEXAFS measurements have been carried out for the vulcanized squalene under liquid phase with He-path system and fluorescence detection mode. Moreover, we have tried curve fitting analysis of NEXAFS spectra. The results indicate that the squalene has been vulcanized by the S8 molecule at 140 ° C and the S8 molecule length is shortened from 8 to 5-6 after the vulcanization reaction.

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  80. Spectroscopic Investigation of the Chemical State of the Hydrogen Storage Materials Composed of the Metal Nanoparticles

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

    Journal of the Japan Institute of Metals and Materials   Vol. 79 ( 3 ) page: 118 - 123   2015

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    &nbsp;&nbsp;We introduce the spectroscopic investigation of the nano-composite materials consisted of Mg and Pd. Mg is most promising material for the application of the hydrogen storage because of the high gravimetric hydrogen storage capacity up to 7.6 mass%. In spite of the advantage of the hydrogen storage capacity, the practical use of Mg has not been established due to the slow hydro-/dehydrogenation reactions and the high temperature required to store and release the hydrogen. Nano-sized Mg such as Mg nanoparticle is expected to store the hydrogen rapidly because of the high specific surface area of the nanoparticle. Moreover, addition of Pd decreases the temperature for the hydrogen storage of Mg because of the catalytic effect for the dissociation reaction of hydrogen molecules. We have fabricated the nanoparticles composed of the both Mg and Pd by the gas evaporation method using He gas. These nanoparticles can store the hydrogen at the room temperature. After the storage of the hydrogen, the release of the hydrogen has not been observed up to 100℃. The analyses of the X-ray absorption fine structure (XAFS) have revealed that the irreversible change of the chemical state during the hydrogen storage causes the inactivation of the surface of nanoparticles and inhibits the dehydrogenation reaction of the MgH<sub>2</sub>.<br>

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  81. Photocatalytic reduction of CO2 with water promoted by Ag clusters in Ag/Ga2O3 photocatalysts

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

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 3 ( 32 ) page: 16810 - 16816   2015

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    Ag loaded Ga2O3 (Ag/Ga2O3) photocatalysts were prepared by an impregnation method and examined for the photocatalytic reduction of CO2 with water where CO, H2 and O2 were formed as products. TEM and X-ray absorption near edge structure (XANES) measurements revealed that around 1 nm sized Ag clusters were formed predominantly in an active Ag/Ga2O3 sample while partially oxidized large Ag particles with the size of several-several tens of nm were observed in a less active Ag/Ga2O3 sample. Both Ag L3-edge and O K-edge XANES analyses suggested that the small Ag clusters accepted more electrons in the d-orbitals as a result of the strong interaction with the Ga2O3 surface. In situ FT-IR measurements of the Ag/Ga2O3 samples showed CO3 stretching vibration bands assignable to monodentate bicarbonate and bidentate carbonate species chemisorbed on the Ga2O3 surface, and to monodentate carbonate species on the large Ag particles. Among these chemisorbed species, the monodentate bicarbonate and/or the bidentate carbonate species changed to bidentate formate species, as the reaction intermediate, under UV light irradiation. The bidentate formate species was formed not by the plasmonic excitation of the Ag nanoparticles but by the photoexcitation of the Ga2O3 semiconductor, and the formation process would be promoted at the perimeter of the Ag clusters on the Ga2O3 surface by the effective separation of electron-hole pairs.

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

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

    SURFACE AND INTERFACE ANALYSIS   Vol. 46 ( 12-13 ) page: 1121 - 1124   2014.12

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    We have fabricated the Ni nanoparticles with a clean surface by the gas evaporation method and clarified the hydrogen storage property by using atomic forcemicroscope (AFM), X-ray photoelectron spectroscopy (XPS) and quartz crystal microbalance(QCM)measurements. The diameter has been estimated as 4.0 ± 1.5nm by AFM observation. The Ni nanoparticles possess a clean surface, because the surface chemical state has been confirmed asmainlymetallic state by XPS. The hydrogen storage property has been investigated by QCM fromthe vacuum to the atmospheric pressure of the hydrogen at 300 K. The plateau pressure of the Ni nanoparticles and amaximum hydrogen storage capacity are about 7 Torr and H/Ni = 0.56, respectively. And the hydrogen release from the Ni nanoparticles has not been observed by QCM. The hydrogen adsorption/desorption reaction have also been observed as the plateau like pressure by QCM. These results indicate that (i) the plateau pressure of Ni is decreased by the nanosizing of the material, (ii) the large specific surface area of the Ni nanoparticlesmakes it possible to observe the adsorption/desorption reaction and (iii) the Ni hydride is stable under the vacuum condition. The chemical shift of Ni 2p3/2 has not been observed in the XPS spectrum between before and after exposure to the hydrogen. This result implies that there is no strong chemical bonding between Ni and hydrogen or the hydrogen in the lateral surface has been released.

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  83. XAFS and XPS study of hydro-/dehydrogenation reaction of Mg-Pd nanoparticles

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

    SURFACE AND INTERFACE ANALYSIS   Vol. 46 ( 12-13 ) page: 1143 - 1146   2014.12

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    The nanoparticles composed of Mg and Pd atoms (Mg-Pd NPs) have been fabricated by the gas evaporation method, and the variation of the chemical state during hydro-/dehydrogenations has been investigated by X-ray photoelectron spectroscopy (XPS) and in-situ X-ray absorption fine structure (XAFS) analyses. Both XPS and XAFS spectra have indicated that the Mg-Pd NPs contain the chemical state of the metallic Pd and Mg-Pd alloy phases. The Mg-Pd alloy phase has been identified as MgPd and Mg6Pd by the Pd K-edge EXAFS analysis. The hydrogen release of the Mg-Pd NPs has not been observed after first hydrogenation due to the migration of Mg toward the surface of the Mg-Pd NPs during the hydrogen storage. This irreversible migration has led the inhibition of the hydrogen diffusion into the surface from the inside of the Mg-Pd NPs.

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  84. Preparation of gold nanoparticles included in anatase-phase titania by solution plasma method

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

    SURFACE AND INTERFACE ANALYSIS   Vol. 46 ( 12-13 ) page: 1125 - 1128   2014.12

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    The gold nanoparticles on titania support (AuNP/TiO2) has been paid attention as a catalyst and a photocatalyst. We perform the preparation of AuNP/TiO2, which is the combination of the sol-gel method and solution plasma method. In this method, we generate the plasma in the gelatinous peroxotitanic acid solution by the discharge between the gold electrodes, and then we synthesize the peroxotitanium gel containing gold nanoparticles. After drying and calcination process, we obtain the AuNP/TiO2 samples. The X-ray diffraction results show that the AuNP/TiO2 is constituted by the nanocrystalline gold and anatase-phase TiO2, and the lattice constant decreases by the embedded gold nanoparticles in the TiO2 matrix. Ultraviolet-Visible absorption spectroscopy shows that the AuNP/TiO2 samples absorb the visible light at about 630nm based on the localized surface plasmon resonance of gold nanoparticles embedded in the TiO2 matrix. The surface chemical states of the AuNP/TiO2 samples are analyzed by the X-ray photoelectron spectroscopy. The surface of AuNP/TiO2 is composed with the majority of oxidized gold and minority of metallic gold which interacted with the TiO2 surface. The Au L3-edge near edge X-ray absorption fine structure spectra indicate that the gold nanoparticles embedded in TiO2 have metallic chemical states. We successfully prepare the gold nanoparticles on the surface and in the matrix of anatase-phase TiO2.

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  85. In situ ultraviolet-visible absorbance measurement during and after solution plasma sputtering for preparation of colloidal gold nanoparticles

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

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 53 ( 11 )   2014.11

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    The absorption spectra of the HCl, NaCl, and NaOH solutions during and after the solution plasma sputtering for the preparation of gold nanoparticles are measured by in situ ultraviolet-visible (UV-vis) spectroscopy to determine the particle diameter and behavior. In the solution plasma sputtering, gold particles are directly formed from the plasma phase and not by the reduction of Au3+ ions dissolved from electrodes. The initial diameter and behavior differ according to the solution used. In HCl solution, gold nanoparticles are formed and dissolve into Au3+ ions. When the solution is saturated, the gold nanoparticles grow by the aggregation of Au3+ ions. Cluster-sized particles are formed in NaCl solution that constitute nanoparticles, which are very stable for several days. Gold nanoparticles of 3 nm diameter are formed in NaOH solution, which aggregate over several days. The contribution of chlorine ions to the day-order stability of gold nanoparticles is suggested.

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  86. Application of nanostructured tungsten fabricated by helium plasma irradiation for photoinduced decolorization of methylene blue

    Komori K., Yoshida T., Yagi S., Yoshida H., Yajima M., Kajita S., Ohno N.

    e-Journal of Surface Science and Nanotechnology   Vol. 12 ( 0 ) page: 343 - 348   2014.7

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    The dendritic nanostructure was fabricated on a surface of tungsten plate by helium plasma irradiation. The nanostructure consisting of W metal was partially oxidized to form WO3 on exposure to air, and the resulting surface exhibited a broad photoabsorption in the range from 1 to 5 eV. We examined photoinduced reaction of methylene blue (MB) on the material. It was found that the partially and fully oxidized surface nanostructures were able to promote a decolorization of MB under photoirradiation even with the near-infrared light (< 1:55 eV), whose energy is lower than the band gap of WO3. The reaction rate was varied with the fraction of W and WO 3 on the surface layers, that is, the partially oxidized sample promoted the reaction at a higher rate than the fully oxidized one. It is also found that the reaction rate decreased with time, which would be caused by the products accumulation on the surface and the surface oxidation. © 2014 The Surface Science Society of Japan.

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  87. In-situ FT-IR study on the mechanism of CO2 reduction with water over metal (Ag or Au) loaded Ga<inf>2O3</inf> photocatalysts

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

    e-Journal of Surface Science and Nanotechnology   Vol. 12 ( 0 ) page: 299 - 303   2014.6

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    Ag loaded Ga2O3 (Ag/Ga2O3) has exhibited photocatalytic activity for CO2 reduction with water to produce COas well as for water splitting to H2 and O2. In-situ FT-IR measurements have shown CO3 stretching vibration bandsassignable to carbonate and bicarbonate species when CO2 molecules chemisorbed on the catalyst surface. Thesespecies change to bidentate formate species under photoirradiation. It subsequently converts to CO by interactingwith water molecules, not chemisorbed OH on the catalyst surface. This result suggests that formate species isan intermediate of the photocatalytic CO2 reduction. On the other hand, Au loaded Ga2O3 (Au/Ga2O3) hasproduced H2 predominantly with a very small amount of CO formation, since the less amount of CO2 moleculeschemisorb on Au/Ga2O3. FT-IR measurements of the Ag/Ga2O3 with high Ag loading have shown carbonatespecies due to the adsorption of atmospheric CO2 on hydroxyl group. The carbonate species is too unstable underphotoirradiation to convert into formate species, but is stabilized as CO2-3 species by the reaction with water.XANES analysis has revealed that atomically dispersed Ag metal species may be effective for the adsorption ofCO2 and the subsequent conversion into formate species to promote the photocatalytic CO2 reduction. © 2014 The Surface Science Society of Japan.

    DOI: 10.1380/ejssnt.2014.299

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  88. The inuence of the preparing method of a Ag/Ga<inf>2</inf>O<inf>3</inf> catalyst on its activity for photocatalytic reduction of CO<inf>2</inf> with water

    Yamamoto N., Yoshida T., Yagi S., Like Z., Mizutani T., Ogawa S., Nameki H., Yoshida H.

    e-Journal of Surface Science and Nanotechnology   Vol. 12 ( 0 ) page: 263 - 268   2014.6

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    We have prepared silver-loaded gallium oxide (Ag/Ga2O 3) photocatalysts by the solution plasma method (SPM) and impregnation method (imp), and investigate the effects of the chemical states and the size of the Ag nanoparticles on their photocatalytic activities. The photocatalytic reduction of CO2 with water proceeds over all the Ag/Ga2O3 photocatalysts to produce CO, however the CO production rates decrease during photocatalytic reaction. Measurements of UV-VIS diffuse reflectance spectra, XANES spectra and TEM images reveal the followings: the Ag oxide nanoparticles in the as-prepared Ag/Ga 2O3 (imp) samples exist and their size distribution is wide from 5 to 10 nm. They become a lot of metallic nanoparticles by UV light-irradiation, and become larger particles with the size of ca. 20 nm during the photocatalytic reaction. On the other hand, the Ag nanoparticles in the as-prepared Ag/Ga2O3 (SPM) samples are metallic with the size of less than 10 nm. The size does not change under UV light irradiation, while become larger particles during the photocatalytic reaction as similar to the case of the Ag/Ga2O3 (imp) samples. Such small metallic Ag nanoparticles with the size of 5-10 nm are suitable for CO production. However, they aggregate during the reaction for 5 h to degrade the photocatalytic activity. © 2014 The Surface Science Society of Japan.

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  89. 29pAE-4 Photocatalysis of nanostructured tungsten materials irradiated by He plasma(29pAE Cross-disciplinary study of metallic surface nanostructures induced by the helium plasma irradiation)

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

    Meeting Abstracts of the Physical Society of Japan   Vol. 69 ( 0 )   2014

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    DOI: 10.11316/jpsgaiyo.69.1.2.0_270_1

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

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

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

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

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  91. XAFS and XPS study of hydro-/dehydrogenation reaction of Mg-Pd nanoparticles Reviewed

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

    Surf. Interface Anal.   Vol. 46   page: 1143-1146   2014

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

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

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

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

    DOI: 10.1384/jsa.20.230

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  93. Morphological and spectroscopic studies on enlargement of Pd anoparticle in l-cysteine aqueous solution by AFM and XPS Reviewed

    C. Tsukada, S. Ogawa, H. Niwa, T. Nomoto, G. Kutluk, H. Namatame, M. Taniguchi, S. Yagi

    Appl. Surf. Sci.   Vol. 267   page: 48-52   2014

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  94. Morphological and spectroscopic studies on enlargement of Pd nanoparticle in L-cysteine aqueous solution by AFM and XPS

    Tsukada C., Ogawa S., Niwa H., Nomoto T., Kutluk G., Namatame H., Taniguchi M., Yagi S.

    APPLIED SURFACE SCIENCE   Vol. 267   page: 48 - 52   2013.2

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    We have revealed the enlargement mechanism of Pd nanoparticles (NPs) on SiO 2 /Si by the AFM observation and the XPS measurement, when the Pd NPs react with the l-cysteine under water environment. Furthermore, the adsorbates on the Pd NPs/SiO 2 /Si have been confirmed by the XPS measurement. The Pd NPs with clean surface are fabricated and deposited on the SiO 2 /Si substrate by the gas evaporation method. In that aspect, the Pd NPs possess an interaction with the SiO 2 /Si surface. When the Pd NPs/SiO 2 /Si is reacted into the l-cysteine aqueous solution, the adsorbates originated from the l-cysteine exist on the Pd NPs surface. On the contrary, the l-cysteine hardly adsorb on the SiO 2 /Si. The enlargement of the Pd NPs is stimulated by the contributions of the H 2 O and/or the l-cysteine molecules because the Pd NPs can be more easily migrated on the SiO 2 /Si surface due to those contributions. © 2012 Elsevier B.V. All rights reserved.

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  95. Spectral studies on sulfur poisoning of Pd/Mg6Ni by NEXAFS and XPS

    Yagi S., Nambu M., Tsukada C., Ogawa S., Kutluk G., Namatame H., Taniguchi M.

    APPLIED SURFACE SCIENCE   Vol. 267   page: 45 - 47   2013.2

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    We have studied on the hydrogen storage materials based on Mg-Ni alloy and fabricated the sample constructed with the Pd thin layer (TL) on Mg 6 Ni alloy substrate. The adsorption behavior of the dimethyl disulfide (DMS) molecules on the sample has been measured to reveal the sulfur poisoning of the Pd TL/Mg 6 Ni by means of XPS and Sulfur K-edge NEXAFS techniques. The chemisorbed DMS, methanethiolate (MT) and atomic S have been observed on the surface. Especially, it is clear that some atomic S has been oxidized by air and detected the adsorbate of the SO 32- and SO 42- species. During exposure to the atmosphere, most of the adsorbed DMS and MT adsorbates desorb from the Pd TL surface. We thus conclude the Pd TL might be able to prevent the hydrogen storage materials from the sulfur poisoning. © 2012 Elsevier B.V. All rights reserved.

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  96. Adsorption reaction of L-cysteine on Au nanoparticle prepared by solution plasma

    Tsukada C., Mizutani T., Ogawa S., Nomoto T., Abe Y., Nameki H., Matsuo K., Kutluk G., Yagi S.

    e-Journal of Surface Science and Nanotechnology   Vol. 11 ( 0 ) page: 18 - 24   2013.2

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    We have investigated the L-cysteine adsorption reaction on the Au nanoparticles (NPs) prepared by means of the solution plasma method. The particle size of the Au NPs is estimated to be 2.4±1.0 nm as prepared. When the L-cysteine adds into the Au NPs colloidal solution, the solution color is quickly changed from red to dark blue. It is found that the adsorbates of L-cysteine thiolate, cystine and atomic sulfur exist on the Au NPs surface by sulfur K-edge NEXAFS. In addition, the Au NPs aggregate each other by the hydrogen bonding at carboxyl groups and produce the black colored precipitate. In this paper, we have revealed the adsorption behavior of the L-cysteine on the Au NPs by AFM, UV-vis, ζ-potential measurement and NEXAFS techniques. © 2013 The Surface Science Society of Japan.

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  97. NEXAFS Study of Air Oxidation for Mg Nanoparticle Thin Film

    Ogawa S., Murakami S., Shirai K., Akanishi K., Ohta T., Yagi S.

    15TH INTERNATIONAL CONFERENCE ON THIN FILMS (ICTF-15)   Vol. 417 ( 1 )   2013

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    The air oxidation reaction of Mg nanoparticle thin film has been investigated by Mg K-edge NEXAFS technique. It is revealed that MgO is formed on the Mg nanoparticle surfaces at the early stage of the air oxidation for Mg nanoparticle thin film. The simulation of NEXAFS spectrum using standard spectra indicates the existence of complex magnesium carbonates (x(MgCO 3).yMg(OH2).z(H2O)) in addition to MgO at the early stage of the air oxidation.

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  98. Spectral studies on sulfur poisoning of Pd/Mg6Ni by NEXAFS and XPS Reviewed

    S. Yagi, M. Nambu, C. Tsukada, S. Ogawa, G. Kutluk, H. Namatame, M. Taniguchi

    Appl. Surf. Sci.   Vol. 267   page: 45-47   2013

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  99. Adsorption behavior of L-cysteine on Ag nanoparticles under water environment studied by S K-edge NEXAFS

    Tsukada C., Yagi S., Nomoto T., Mizutani T., Ogawa S., Nameki H., Nakanishi Y., Kutluk G., Namatame H., Taniguchi M.

    APPLIED SURFACE SCIENCE   Vol. 262   page: 231 - 233   2012.12

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    We have focused on the biocompatibility of the Ag nanoparticles. In this paper, we have fabricated the Ag nanoparticles by means of the solution plasma method. Since this method does not need to use the surfactant molecule, such as the water soluble polymer, the fabricated nanoparticle might possess the clean surface. The average diameter of the Ag nanoparticles is estimated to be 5.0 ± 1.1 nm. NEXAFS spectra show l-cysteine thiolate adsorbs on the Ag nanoparticle surface and l-cystine is synthesized. Though this reaction behavior is similar to the result of Rh(PVP, polyvinylpyrrolidone) system, in our previous study, the reaction speed for the Ag nanoparticle is much faster than that for the Rh(PVP) nanoparticle. © 2012 Elsevier B.V. All rights reserved.

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  100. Aggregation mechanism of Pd nanoparticles in L-cysteine aqueous solution studied by NEXAFS and AFM

    Tsukada C., Ogawa S., Mizutani T., Kutluk G., Namatame H., Taniguchi M., Yagi S.

    APPLIED SURFACE SCIENCE   Vol. 262   page: 184 - 187   2012.12

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    We focus on the biocompatibility of Pd nanoparticles (NPs) from the point of microscopic view. Thus, as the basic research for the biocompatibility, we have investigated the adsorbates on the Pd NPs surface and the aggregation mechanism for the Pd NPs on Si substrate after dipping into l-cysteine aqueous solution by means of NEXAFS measurement and AFM observation. The Pd NPs have been fabricated and deposited on the Si wafer by the gas evaporation method. Judging from the results of NEXAFS measurement, it is clear that the l-cysteine thiolate and atomic S exist on the Pd NPs surface. The results of AFM observation show that the Pd NPs aggregate. It is thought that the aggregation of the Pd NPs occurs by both the migration of the Pd NPs on Si wafer and the cross-linked reaction. © 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.apsusc.2012.04.123

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  101. In-Situ XPS measurement of co nanoparticles fabricated by gas evaporation method

    Mizutani T., Ogawa S., Tsukada C., Nakanishi K., Ohta T., Yagi S.

    e-Journal of Surface Science and Nanotechnology   Vol. 10 ( 0 ) page: 351 - 354   2012.7

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    The cobalt and cobalt nitride nanoparticles (NPs) have been fabricated by gas evaporation method under helium or nitrogen gases environment. These chemical states and compositions have been investigated by in-situ XPS and those distributions have been estimated by AFM. It is found that both cobalt and cobalt nitride NPs are slightly oxidized by the residual gas in the chamber. The cobalt nitride NPs fabricated under nitrogen gas are including the nitrogen atoms at 4.7% and the nitrogen atoms have the chemical bonding with the cobalt atoms. © 2012 The Surface Science Society of Japan.

    DOI: 10.1380/ejssnt.2012.351

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  102. (CH3)2S adsorption behavior on Pd/Mg thin film surface studied by NEXAFS

    Shirai K., Tsukada C., Kutluk C., Namatame H., Taniguchi M., Yagi S.

    e-Journal of Surface Science and Nanotechnology   Vol. 10 ( 0 ) page: 194 - 197   2012.5

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    A dissociation reaction of (CH3) 2S (dimethyl sulfide*DMS) on a Pd capped Mg layer surface has been studied by using Sulfur K-edge Near Edge X-ray Absorption Fine Structure (NEXAFS) technique. The Pd thin film is prepared by two deposition methods, one is vacuum deposition, and the other is DC magnetron sputtering. The surface morphology is observed by Atomic Force Microscopy (AFM). The AFM observation reveals that there are many nano sized particles on the Pd/Mg surface, and an average size of the particle prepared by DC magnetron sputtering is obviously smaller than that prepared by vacuum deposition. NEXAFS analysis reveals that DMS dissociation is weakened on the Pd surface prepared by DC magnetron sputtering and promoted on the Pd surface prepared by vacuum deposition. It seems that any adsorption reactions are promoted on small sized metal particles, however, the DMS dissociation reaction is promoted on the Pd surface prepared by vacuum deposition, which has big sized Pd particles. © 2012 The Surface Science Society of Japan.

    DOI: 10.1380/ejssnt.2012.194

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  103. Generation of gaseous sulfur-containing compounds in tumour tissue and suppression of gas diffusion as an antitumour treatment

    Yamagishi Kazue, Onuma Kazuo, Chiba Yota, Yagi Shinya, Aoki Shigenobu, Sato Tomoyuki, Sugawara Yasushi, Hosoya Noriyasu, Saeki Yasutake, Takahashi Minoru, Fuji Masayoshi, Ohsaka Takeo, Okajima Takeyoshi, Akita Kenji, Suzuki Takashi, Senawongse Pisol, Urushiyama Akio, Kawai Kiyoshi, Shoun Hirofumi, Ishii Yoshimasa, Ishikawa Hiroya, Sugiyama Shigeru, Nakajima Madoka, Tsuboi Masaru, Yamanaka Tateo

    GUT   Vol. 61 ( 4 ) page: 554 - 561   2012.4

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    Background and aims: The mechanisms of cancer cell growth and metastasis are still not entirely understood, especially from the viewpoint of chemical reactions in tumours. Glycolytic metabolism is markedly accelerated in cancer cells, causing the accumulation of glucose (a reducing sugar) and methionine (an amino acid), which can non-enzymatically react and form carcinogenic substances. There is speculation that this reaction produces gaseous sulfur-containing compounds in tumour tissue. The aims of this study were to clarify the products in tumour and to investigate their effect on tumour proliferation. Methods: Products formed in the reaction between glucose and methionine or its metabolites were analysed in vitro using gas chromatography. Flatus samples from patients with colon cancer and exhaled air samples from patients with lung cancer were analysed using near-edge x-ray fine adsorption structure spectroscopy and compared with those from healthy individuals. The tumour proliferation rates of mice into which HT29 human colon cancer cells had been implanted were compared with those of mice in which the cancer cells were surrounded by sodium hyaluronate gel to prevent diffusion of gaseous material into the healthy cells. Results: Gaseous sulfur-containing compounds such as methanethiol and hydrogen sulfide were produced when glucose was allowed to react with methionine or its metabolites homocysteine or cysteine. Near-edge x-ray fine adsorption structure spectroscopy showed that the concentrations of sulfur-containing compounds in the samples of flatus from patients with colon cancer and in the samples of exhaled air from patients with lung cancer were significantly higher than in those from healthy individuals. Animal experiments showed that preventing the diffusion of sulfur-containing compounds had a pronounced antitumour effect. Conclusions: Gaseous sulfur-containing compounds are the main products in tumours and preventing the diffusion of these compounds reduces the tumour proliferation rate, which suggests the possibility of a new approach to cancer treatment.

    DOI: 10.1136/gutjnl-2011-300721

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  104. Adsorption behavior of l-cysteine on Ag nanoparticles under water environment studied by S K-edge NEXAFS Reviewed

    C. Tsukada, S. Yagi, T. Nomoto, T. Mizutani, S. Ogawa, H. Nameki, Y. Nakanishi, G. Kutluk, H. Namatame, M. Taniguchi

    Appl. Surf. Sci.   Vol. 262   page: 231-233   2012

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  105. Aggregation mechanism of Pd nanoparticles in l-cysteine aqueous solution studied by NEXAFS and AFM Reviewed

    C. Tsukada, S. Ogawa, T. Mizutani, G. Kutluk, H. Namatame, M. Taniguchi, S. Yagi

    Appl. Surf. Sci.   Vol. 262   page: 184-187   2012

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

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

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

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

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

    Tsukada Chie, Mizutani Tsuyoshi, Ogawa Satoshi, Nomoto Toyokazu, Nameki Hironori, Ueno Tetsuro, Sawada Masahiro, Kutluk Galif, Namatame Hirofumi, Taniguchi Masaki, Yoshida Tomoko, Yagi Shinya

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

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

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

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

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

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  109. IN-SITU MG K- AND PD L-3-EDGES NEXAFS INVESTIGATION OF MG-PD NANOPARTICLES

    Ogawa Satoshi, Mizutani Tsuyoshi, Ogawa Masahiro, Yogi Chihiro, Ohta Toshiaki, Yoshida Tomoko, Yagi Shinya

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

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  110. Characterization of nanoparticles fabricated by glow discharge during the solution plasma without surfactant molecule

    Mizutani T., Abe Y., Hamaguchi H., Nameki H., Yagi S.

    NANOCON 2012 - Conference Proceedings, 4th International Conference     page: 787 - 792   2012

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    The fabrication of nanoparticles by glow discharge during the solution plasma has been paid attention as a new fabrication method. However the fabrication mechanism of the nanoparticles by the solution plasma is still unknown. We fabricate gold nanoparticles under aqueous solution with various concentration of NaCl as an electrolyte. The diameters of the gold nanoparticles are estimated by AFM observation, and the dispersibility of the nanoparticles is analyzed by UV-Vis measurement. The NaCl concentration range from 0.1 to 10 mM is suitable for the fabrication of the gold nanoparticles with well dispersibility. The surface chemical state of the gold nanoparticle is revealed by the XPS and NEXAFS measurements. The surface of gold nanoparticles fabricated under NaCl aqueous solution possesses larger amount of Au3+ state and smaller of Au+ than that of the gold nanoparticles fabricated under deionized water. The Cl K-edge NEXAFS measurement suggests that there are no ligand ions in the gold nanoparticle colloidal solution.

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  111. CHARACTERIZATION OF NANOPARTICLES FABRICATED BY GLOW DISCHARGE DURING THE SOLUTION PLASMA WITHOUT SURFACTANT MOLECULE

    Mizutani Tsuyoshi, Abe Yoshitada, Hamaguchi Hiroaki, Nameki Hirofumi, Yagi Shinya

    NANOCON 2012, 4TH INTERNATIONAL CONFERENCE     page: 787 - 792   2012

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  112. Size dependence of air oxidation for Mg nanoparticle

    Ogawa S., Murakami S., Shirai K., Nakanishi K., Tsukada C., Ohta T., Yagi S.

    e-Journal of Surface Science and Nanotechnology   Vol. 9 ( 9 ) page: 315 - 321   2011.9

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    The size dependence of the air oxidation for Mg nanoparticles is studied by Mg K-edge NEXAFS and AFM techniques. In the case of the exposure to the air for 3 days, the degree of the air oxidation for Mg nanoparticles increases with reduction of the size of Mg nanoparticle. However, the opposite size dependence is observed in the case of the exposure to the air for 25 days, i.e. the air oxidation reaction for the smaller Mg nanoparticles is more inhibited in the case of long term exposure to the air. This size dependence is attributed to the occupation of the free spaces between Mg nanoparticles, which protects against the incursion of the air component molecules into the multilayer of Mg nanoparticles. © 2011 The Surface Science Society of Japan.

    DOI: 10.1380/ejssnt.2011.315

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  113. Origin of large thermoelectric power in off-stoichiometric Fe <inf>2</inf>VAl-based alloys

    Soda K., Harada S., Kato M., Yagi S., Sandaiji Y., Nishino Y.

    IOP Conference Series: Materials Science and Engineering   Vol. 18 ( SYMPOSIUM 9C )   2011.8

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    The valence-band and core-level soft x-ray photoelectron spectroscopy has been applied to investigate the origin of the large thermoelectric power in the off-stoichiometric and partially-substituted Fe-based Heusler-type alloys Fe2-x-yIryV1+xAl and Fe2-xV 1+x-yTiyAl. The non-rigid-band-like change in the valence-band electronic structure near the Fermi level EF is found for the off-stoichiometric change x in Fe and V concentrations, whereas the rigid-bandlike shift of EF is recognized on the Ir or Ti substitution y. The non-rigid-band-like change may be induced by the excess-V or Fe (anti-site defects)-derived states in the pseudogap of Fe2VAl, while the rigid-band-like shift may be caused by a common band formation, where the d states of the substituted elements are incorporated into the main Fe-V 3d bands. The V2p core-level spectra consistently show the satellite structure due to the excess V as the anti-site defect. A model electronic structure is presented for explaining the observed enhancement of their thermoelectric power. © 2011 Ceramic Society of Japan.

    DOI: 10.1088/1757-899X/18/14/142004

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  114. Adsorption reaction of amino acid molecule on pd thin layer surface constructed by nano-dots under water environment

    Tsukada C., Ogawa S., Niwa H., Yagi S., Nomoto T., Kutluk G., Namatame H., Taniguchi M., Nomoto T., Kutluk G., Namatame H., Taniguchi M.

    e-Journal of Surface Science and Nanotechnology   Vol. 9 ( 9 ) page: 289 - 292   2011.7

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    The adsorption reaction of L-cysteine on Pd thin layer surface constructed by nano-dots under water envi- ronment has been investigated by S K-edge NEXAFS with He-path system under atmospheric pressure. It is revealed that L-cysteine physisorbs on Pd/Al2O3/NiAl(111) substrate surface through the thiol group and the carboxyl one, and chemisorbed L-cysteine exists on the surface as L-cysteine thiolate. Before and after dipping the Pd/Al 2O3/NiAl(111) substrate into L-cysteine aqueous solution, the surface morphology is observed using AFM. The morphology of the Pd/Al 2O3/NiAl(111) substrate is composed of many nano-dots before dipping. After dipping, the nano-dots are enlarged. ©2011.289] 2011 The Surface Science Society of Japan.

    DOI: 10.1380/ejssnt.2011.289

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  115. Dependence of Si+ and Si2+ sputtering yields on residual oxygen impurity

    Sakuma Yasuhiro, Kato Masahiko, Yagi Shinya, Soda Kazuo

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS   Vol. 269 ( 9 ) page: 999 - 1002   2011.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms  

    The Si+ and Si2+ sputtering yields have been measured by time-of-flight (TOF) method under the bombardment of a pulsed 11 keV Ar 0 beam on a nominally clean Si(1 1 1) surface. Although the residual oxygen impurity is below the detection limit of Auger electron analysis (∼0.01 monolayer), the SiO+ ions are clearly observed and its yield can be regarded as a measure of the residual O impurity on the Si surface region. The Si+ TOF spectrum changes its shape and the Si+ yield increases linearly with the SiO+ yield, while the shape of the Si2+ TOF spectrum and the Si2+ yield remain almost unchanged. The change in the Si+ TOF spectrum is attributed to the increasing SiH+ yield, which may be caused by the H2O adhesion to the Si surface during the TOF measurement. The increase in the adsorbing H2O may also lead to the enhancement of SiO+ and Si+ yields; Si+ ions may be created through the charge exchange process between O and Si due to difference in their electron affinity. The insensitivity of the Si2+ yield to the residual O impurity is consistent with the Si2+ formation by the Auger ionization process of the excited Si+ having the 2p hole, which is produced in the collision cascades. © 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nimb.2010.12.028

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  116. Soft X-ray photoemission study of thermoelectric alloys Fe2-x-yIryV1+xAl and Fe2-xV1+x-yTiyAl

    Soda Kazuo, Harada Shota, Kato Masahiko, Yagi Shinya, Inukai Manabu, Miyazaki Hidetoshi, Sandaiji Yusuke, Tamada Yuko, Tanaka Suguru, Sugiura Takahiro, Nishino Yoichi

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   Vol. 184 ( 3-6 ) page: 236 - 239   2011.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Electron Spectroscopy and Related Phenomena  

    The valence-band and core-level photoemission spectra of n-type thermoelectric Heusler(L21)-type alloys Fe2 - x - yIr yV1 + xAl and p-type ones Fe2 - xV 1 + x - yTiyAl have been studied to clarify the origin of the enhancement of their thermoelectric power. It is found that the excess V content x (V-rich for x > 0 and Fe-rich for x < 0) causes the drastic change in the valence-band electronic structure within the binding energy of ∼0.7 eV near the Fermi level EF and the evolution of the satellite structures in the V 2p core-level spectra with x increased. These spectral features are ascribed to the formation of the Fe or V anti-site defects in the off-stoichiometric alloys with non-zero x. The shift of the valence-band and core-levels towards the high (low) binding energy side is observed on partial substitution y of Ir (or Ti) for Fe (or V), which is attributed to the EF shift due to the common band formation with the Ir 5d or Ti 3d states incorporated into the main Fe-V 3d bands. The enhancement of the thermoelectric power in those Heusler-type alloys can be explained in terms of the observed changes in the valence-band electronic structure near E F. © 2011 Elsevier B.V.

    DOI: 10.1016/j.elspec.2011.03.001

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  117. Ionization probability of secondary ions sputtered from Si(111) and Ge(111) surfaces

    Sakuma Yasuhiro, Kato Masahiko, Yagi Shinya, Soda Kazuo

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS   Vol. 269 ( 3 ) page: 257 - 262   2011.2

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    We have measured the energy distributions of the secondary ions sputtered from the Si(1 1 1) and Ge(1 1 1) surfaces and investigated the ionization probabilities of sputtered Si+ and Ge+ ions for clarifying their ionization mechanisms. The observed ionization probabilities depend on the velocity of Si+ and Ge+ ions. This velocity dependence can be successfully analyzed by a theoretical expression, which was proposed originally for the metal surfaces. This implies that the ionization mechanism of Si+ and Ge+ ions is the same as ions sputtered from the metal surface, i.e., the resonant electron transfer in the high velocity regime and the thermal excitation process in the low velocity regime. The difference in the ionization probability between Si+ and Ge+ ions is well explained by the difference in the band gap energy. © 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nimb.2010.11.020

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  118. Fabrication of Rh Nanoparticle and Adsorption Reaction with DMS Studied by NEXAFS and XPS

    Niwa H., Ogawa S., Nakanishi K., Kutluk G., Ohta T., Yagi S.

    Journal of Surface Analysis   Vol. 17 ( 3 ) page: 278 - 281   2011

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    We have studied the adsorption reaction of DMS on the Rh nanoparticle fabricated by the gas evaporation method by using AFM, XPS and NEXAFS techniques. The AFM result shows that we can fabricate the Rh nanoparticle which has a small diameter with a small distribution and high dispersion of it by the gas evaporation method with the Rh wire as an evaporation source. The Rh L<sub>3</sub>-edge NEXAFS spectra indicate that the surface and bulk of Rh nanoparticle is stable in the chemical state of Rh<sup>0</sup> despite the exposure to air. The Rh 3d XPS and S K-edge NEXAFS results show the lower degree of oxidized Rh nanoparticle has the stronger bonding with atomic S than the more oxidized one.

    DOI: 10.1384/jsa.17.278

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  119. The spectroscopic study on the chemical state at Pd/Mg interface

    Murakami S., Ogawa S., Shirai K., Tsukada C., Yagi S., Nakanishi K., Ohta T.

    e-Journal of Surface Science and Nanotechnology   Vol. 9 ( 9 ) page: 438 - 441   2011

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    The chemical state of interface between Pd and Mg layers has been investigated by XPS and NEXAFS methods. Since it is thought that the hydrogen storage ability strongly depends on the chemical state of the interface, we focus on the interface of the Pd-Mg. It is found that the different phase from bulk metal or oxide exists between Pd and Mg layers prepared by both DC magnetron sputtering and vacuum evaporation methods. From XPS and NEXAFS measurements, we have revealed that Pd loses the electron and Mg picks up one in this phase. It might be thought that the Pd-Mg alloy phase exists between Pd and Mg. © 2011 The Surface Science Society of Japan.

    DOI: 10.1380/ejssnt.2011.438

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  120. Spectroscopic Study on the Adsorption Reaction of L-Cysteine on Cu nanoparticle/Ag under <i>in vivo</i> condition

    Yamada Y., Kutluk G., Namatame H., Taniguchi M., Yagi S.

    Journal of Surface Analysis   Vol. 17 ( 3 ) page: 194 - 197   2011

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    We have studied the adsorption reaction of L-Cysteine on Cu nanoparticle by S K-edge NEXAFS measurement. The Cu nanoparticle used for the adsorption reaction is fabricated by the gas evaporation method. The results of the NEXAFS measurement are given as follows. The electron transfer between Cu nanoparticle and substrate changes the chemical state of Cu nanoparticle. The behavior of adsorbed L-Cysteine is influenced by the electron transfer between Cu nanoparticle and substrate. This result suggests the possibility that the catalytic activity of nanoparticle can be controlled by the electron transfer between nanoparticle and substrate.

    DOI: 10.1384/jsa.17.194

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  121. Spectroscopic study of Ni-rich Al-Co-Ni quasicrystal

    Soda K., Inukai M., Kato M., Yagi S., So Y. -G., Edagawa K.

    PHILOSOPHICAL MAGAZINE   Vol. 91 ( 19-21 ) page: 2510 - 2518   2011

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    The valence-band electronic structure of a decagonal Ni-rich Al-Co-Ni quasicrystal, Al72Co8Ni20, was investigated using soft X-ray photoelectron spectroscopy. In particular, the energy distributions of the transition metal 3d bands were determined from the Co and Ni 2p-3d resonance photoemission and compared with those calculated by the discrete variational Xα method for a model cluster based on a proposed Ni-rich Al-Co-Ni approximant, as well as the 3d band observed in the Co-rich Al-Co-Ni quasicrystal, Al72Co16Ni12. In the Ni-rich Al-Co-Ni, the transition metal 3d band exhibits a peak at a binding energy, EB, of 2.3 eV, which is higher than that of the Co-rich Al-Co-Ni. The observed Ni 3d band has a single-peaked distribution around EB ∼2.4 eV, in contrast to the calculated bimodal and wide-spread distribution for the proposed Ni-rich Al-Co-Ni model cluster, whereas the Co 3d band is located at EB ∼1.7 eV, consistent with the model calculation. © 2011 Taylor & Francis.

    DOI: 10.1080/14786435.2010.526651

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  122. Influence of CO<sub>2</sub> and H<sub>2</sub>O on Air Oxidation of Mg Nanoparticles Studied by NEXAFS

    Ogawa S., Niwa H., Nakanishi K., Ohta T., Yagi S.

    Journal of Surface Analysis   Vol. 17 ( 3 ) page: 319 - 323   2011

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    Publishing type:Research paper (scientific journal)   Publisher:一般社団法人 表面分析研究会  

    Influence of CO<sub>2</sub> and H<sub>2</sub>O on the air oxidation reaction of Mg nanoparticles has been investigated by Mg K-edge NEXAFS technique. The water vapor in the air causes rapid progression on the air oxidation reaction of the Mg nanoparticles. The basic magnesium carbonate (4(MgCO<sub>3</sub>).Mg(OH<sub>2</sub>).4(H<sub>2</sub>O) : BMC) is formed by the long term exposure to air. The NEXAFS analysis shows an existence of several intermediates of the BMC formation reaction.

    DOI: 10.1384/jsa.17.319

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  123. Influence of CO2 and H2O on Air Oxidation of Mg Nanoparticles Studied by NEXAFS Reviewed

    S. Ogawa, H. Niwa, K. Nakanishi, T. Ohta, S. Yagi

    Journal of Surface Analysis   Vol. 17   page: 319-323   2011

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Books 3

  1. 機能材料に使われる放射光

    曽田一雄、八木伸也( Role: Joint author)

    日本工業出版「光アライアンス」  2005 

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  2. *内殻分光 -元素選択性をもつX線内殻分光の歴史・理論・実験法・応用-

    太田俊明、横山利彦(編著)、その他執筆分担者(25名)( Role: Joint author)

    アイピーシー  2007.3 

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    Language:Japanese

    元素選択性をもつX線内殻分光の歴史・理論・実験法・応用について

  3. 自動車触媒の最新技術および劣化対策と貴金属低減

    共著( Role: Joint author)

    情報機構  2010.12 

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    Language:Japanese

    自動車に搭載されている排気ガス浄化触媒について多くの専門家による解説書です。特に白金族元素を利用した触媒(ナノ材料)の被毒や劣化、そして回復および金属使用量の削減について取り上げています。

MISC 12

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

    Muneaki Yamamoto, Shinya Yagi, Tomoko Yoshida

    Catalysis Today   Vol. 303   page: 334 - 340   2018.4

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)   Publisher:Elsevier B.V.  

    Ag species in the Ag loaded Ga2O3 (Ag/Ga2O3) photocatalysts were investigated with regard to changes in their structures and the chemical states before and after the photocatalytic CO2 reduction with water. Ag clusters with the size of around one nanometer in as prepared 0.1 wt% Ag/Ga2O3 sample became larger metallic Ag nanoparticles with the size of several nanometers after the reaction. In the 1.0 wt% Ag/Ga2O3 sample, Ag nanoparticles having the AgGaO2 interface structure decomposed to aggregated Ag metal particles after the reaction. Such transition in the morphology and chemical states of Ag species could explain the variations in photocatalytic activities of these samples during the reaction, and suggested that at least metallic Ag particles would function as effective co-catalysts. In-situ FT-IR measurements of the Ag/Ga2O3 samples before and after the reaction, we could not detect CO2 molecules adsorbing on metallic Ag nanoparticles in dark. Under light irradiation, however, the absorption bands originated from the photo-adsorbed CO2 species on Ag metal nanoparticles appeared. Thus, we detected the interaction of CO2 molecules and metallic Ag nanoparticles as the effective co-catalysts for CO2 reduction.

    DOI: 10.1016/j.cattod.2017.09.025

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

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

    Catalysis Today   Vol. 303   page: 320 - 326   2018.4

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    Silver nanoparticles (Ag NPs) were synthesized by a solution plasma method (SPM) in an aqueous solution of ammonia. Optical emission spectra of the plasma revealed that Ag NPs are fabricated with the sputtering of Ag rods as electrode by the produced energetic plasma particles such as H, OH and O radicals. In-situ optical absorption measurements of the solution during the discharge directly presented the concerted formation and aggregation processes of the Ag NPs, which controlled the size of Ag NPs. The synthesized Ag NPs were loaded on gallium oxide (Ga2O3) photocatalyst, and the photocatalytic activities of the obtained Ag loaded Ga2O3 (Ag/Ga2O3) samples were evaluated. Although the photocatalytic reaction proceeded over all the samples to produce CO, the CO production rates decreased with the reaction time. Measurements of DR UV–vis spectra and TEM images revealed that a part of the Ag NPs migrated and aggregated on the photocatalyst surface to become larger particles during the photocatalytic reaction, which would be related to the decrease of the photocatalytic activity. It was also found that the photoirradiation treatment on the prepared Ag/Ga2O3 sample before the use for the photocatalytic reaction improves the photocatalytic performance.

    DOI: 10.1016/j.cattod.2017.08.047

    Scopus

  3. Robust Binding between Carbon Nitride Nanosheets and a Binuclear Ruthenium(II) Complex Enabling Durable, Selective CO2 Reduction under Visible Light in Aqueous Solution

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

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 56 ( 17 ) page: 4867 - 4871   2017.4

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    Carbon nitride nanosheets (NS-C3N4) were found to undergo robust binding with a binuclear ruthenium(II) complex (RuRu') even in basic aqueous solution. A hybrid material consisting of NS-C3N4 (further modified with nano-particulate Ag) and RuRu' promoted the photocatalytic reduction of CO2 to formate in aqueous media, in conjunction with high selectivity (approximately 98%) and a good turnover number (&gt; 2000 with respect to the loaded Ru complex). These represent the highest values yet reported for a powder-based photocatalytic system during CO2 reduction under visible light in an aqueous environment. We also assessed the desorption of RuRu' from the Ag/C3N4 surface, a factor that can contribute to a loss of activity. It was determined that desorption is not induced by salt additives, pH changes, or photoirradiation, which partly explains the high photocatalytic performance of this material.

    DOI: 10.1002/anie.201701627

    Web of Science

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

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

    INTERNATIONAL CONFERENCE ON SOLID FILMS AND SURFACES (ICSFS 2014)   Vol. 76   page: 012001   2015

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    The gold nanoparticles (Au NPs) colloidal solution and the phosphatidylcholine (PC) liposome aqueous solution are fabricated by the solution plasma method and the extrusion procedure, respectively. When the Au NPs colloidal solution and the PC liposome aqueous solution are mixed, considering the TEM image, we think that the Au NPs firstly are covered with the PC molecules, which do not contribute to form the PC liposome, and subsequently the Au NPs covered with the PC adsorb on the PC liposome surface. We propose that the PC molecule adsorbs on the Au sheet surface at the methyl group of N-CH3 and the oxygen atoms of P-O, P=O, C-O and C=O bonds, because each peak intensity of N, O and P K-edges NEXAFS spectra for the PC/Au sheet is reduced in comparison with that for the PC multilayer. Furthermore, the Au NPs covered with PC seem to be aggregated each other through the hydrophobic groups of PC on Au NPs.

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

    Web of Science

  5. 金属ナノ粒子を用いた水素吸蔵材料の分光学的手法による化学状態分析 Reviewed

    小川智史, 内山直樹, 藤本大志, 金井友美, 八木伸也

    日本金属学会誌   Vol. 79 ( 3 ) page: 118-123   2015

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  6. Vulcanization reaction of squalene and S8 powder studied by Sulfur K-edge NEXAFS under liquid phase Reviewed

    S. Yagi, Y. Menjo, C. Tsukada, S. Ogawa, G. Kutluk, H. Namatame, M. Taniguchi

    IOP Conference Series: Materials Science and Engineering   Vol. 76   page: 0120004   2015

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    DOI: 10.1088/1757-899X76/1/012004

  7. XAFS and XPS study of hydro-/dehydrogenation reaction of Mg-Pd nanoparticles Reviewed

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

    Surf. Interface Anal.   Vol. 46   page: 1143-1146   2014

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  8. Morphological and spectroscopic studies on enlargement of Pd anoparticle in l-cysteine aqueous solution by AFM and XPS Reviewed

    C. Tsukada, S. Ogawa, H. Niwa, T. Nomoto, G. Kutluk, H. Namatame, M. Taniguchi, S. Yagi

    Appl. Surf. Sci.   Vol. 267   page: 48-52   2014

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  9. Spectral studies on sulfur poisoning of Pd/Mg6Ni by NEXAFS and XPS Reviewed

    S. Yagi, M. Nambu, C. Tsukada, S. Ogawa, G. Kutluk, H. Namatame, M. Taniguchi

    Appl. Surf. Sci.   Vol. 267   page: 45-47   2013

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  10. Adsorption behavior of l-cysteine on Ag nanoparticles under water environment studied by S K-edge NEXAFS Reviewed

    C. Tsukada, S. Yagi, T. Nomoto, T. Mizutani, S. Ogawa, H. Nameki, Y. Nakanishi, G. Kutluk, H. Namatame, M. Taniguchi

    Appl. Surf. Sci.   Vol. 262   page: 231-233   2012

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  11. Aggregation mechanism of Pd nanoparticles in l-cysteine aqueous solution studied by NEXAFS and AFM Reviewed

    C. Tsukada, S. Ogawa, T. Mizutani, G. Kutluk, H. Namatame, M. Taniguchi, S. Yagi

    Appl. Surf. Sci.   Vol. 262   page: 184-187   2012

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  12. Influence of CO2 and H2O on Air Oxidation of Mg Nanoparticles Studied by NEXAFS Reviewed

    S. Ogawa, H. Niwa, K. Nakanishi, T. Ohta, S. Yagi

    Journal of Surface Analysis   Vol. 17   page: 319-323   2011

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▼display all

Presentations 74

  1. 小型放射光源と固体表面に吸着した分子の表面XAFS

    八木伸也

    『超小型放射光源とその産業応用に関する研究会』(科学技術交流財団)第8回研究会 

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    Event date: 2001.6

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

    Country:Japan  

    固体表面に原子や分子が吸着した時の構造を調べることは、原子・分子サイズでの表面制御につながる知見が得られると考えられる。本講演では、まず広島大学放射光科学研究センターに設置された「小型放射光源:HiSOR」に接続された、「二結晶分光ライン」の設計・立ち上げ調整について述べる。そして小型放射光源でも「表面の研究ができるんだ」ということについて、硫黄原子を含んだ分子が遷移金属単結晶表面に吸着した場合の表面XAFS法の結果について発表する。

  2. 小型放射光源に適したビームラインの立ち上げ:HiSORの例

    八木伸也

    第7回「超小型放射光源とその産業応用に関する研究会」 

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    Event date: 2001.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  3. 分子吸着系材料と原子力産業の接点

    八木伸也

    北陸原子力懇談会 

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    Event date: 2002.11

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

    Country:Japan  

  4. 高性能自動車触媒を求めて--HiSORの例--

    八木伸也

    第4回日比科学技術振興財団講演会 

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    Event date: 2003.11

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

    Country:Japan  

  5. 小型放射光源の産業利用ーー谷口・マツダプロジェクトーー

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    Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  6. 貴金属ナノ粒子を用いた触媒の評価

    八木伸也、Galif Kutluk、住田弘祐、生天目博文

    電気学会・原子力研究会 

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    Event date: 2005.9

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

    Country:Japan  

  7. XPS及びNEXAFSを用いたRh(100)基板加熱温度に依存した(CH3)2Sの吸着反応に関する研究

    野本豊和、八木伸也、アーリップ・クトゥルク、曽田一雄、橋本英二、谷口雅樹

    第96回触媒討論会 

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    Event date: 2005.9

    Language:Japanese   Presentation type:Poster presentation  

    Country:Japan  

  8. 広島大学放射光科学研究センター(HSRC)BL11における軟X線蛍光X線分析・XAFS測定

    早川慎二郎,江角 拓,牧山勇介,八木伸也,馬込栄輔,森吉千佳子,喬 山,森川敦史,東野 達,生天目博文,廣川 健

    第14回X線分析講習会・第41回X線分析討論会 

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    Event date: 2005.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  9. 広島大学放射光科学研究センター(HSRC)BL11における軟X線蛍光X線分析・XAFS測定

    早川慎二郎,江角 拓,牧山勇介,八木伸也,馬込栄輔,森吉千佳子,喬 山,森川敦史,東野 達,生天目博文,廣川 健

    第41回X線分析討論会 

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    Event date: 2005.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  10. AFM,XPS,NEXAFSを用いた金属表面粗さに依存した(CH3)2S吸着反応の研究

    野本豊和、八木伸也、アーリップ・クトゥルク、曽田一雄、橋本英二、谷口雅樹

    第25回表面科学講演大会 

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    Event date: 2005.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  11. 金属ナノ粒子を用いたナノホール薄膜とその医療応用の可能性

    八木伸也

    新材料システム研究会・JST東海 

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    Event date: 2006.2

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

    Country:Japan  

  12. Molecular adsorption system on transition metal surface studied by NEXAFS and XPS International conference

    Shinya YAGI

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    Event date: 2006.7

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

  13. 貴金属ナノ粒子から成る薄膜とその応用

    八木伸也

    第16回『ナノテク部会』研究会 

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    Event date: 2007.1

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

    Country:Japan  

  14. 酸素修飾Rh(111)表面に吸着した(CH3)2SのNEXAFS及びXPSによる研究

    野本豊和,八木伸也,曽田一雄,生天目博文,谷口雅樹

    第10回XAFS討論会 

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    Event date: 2007.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  15. 硫黄K吸収端XAFSによる同位体水分子環境におけるヘモグロビンと硫化水素の反応に関する研究

    八木伸也,朴三用,山岸一枝,生天目博文,谷口雅樹

    第10回XAFS討論会 

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    Event date: 2007.7

    Language:Japanese   Presentation type:Poster presentation  

    Country:Japan  

  16. 水同位体を用いた貴金属ナノ粒子の作製とその化学状態分析

    櫻井陽子、八木伸也

    第6回同位体科学研究会 

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    Event date: 2008.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  17. XAFS measurement system under atomospheric pressure for materials science in soft X-ray energy region

    11th HiSOR International Symposium 2007 

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    Event date: 2007.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  18. The adsorption reaction of (CH3)2S on clean and oxygen modified Rh(111) studied by XPS and NEXAFS

    11th HiSOR International Symposium 2007 

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    Event date: 2007.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  19. NEXAFS and XPS studies of (CH3)2S and H2O coadsorption on Rh(100) surface

    11th HiSOR International Symposium 2007 

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    Event date: 2007.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  20. Characterization of PVP-stabilized rhodium nanoparticles studied by Cl K-edge and Rh L3-edge NEXAFS

    11th HiSOR International Symposium 2007 

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    Event date: 2007.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  21. Natural oxidization of Pd nanoparticles fabricated by gas evaporation method

    11th HiSOR International Symposium 2007 

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    Event date: 2007.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  22. Reaction between L-cysteine and Rh(PVP) nanoparticle studied by S-K and Cl-K edges NEXAFS

    12th HiSOR International Symposium 2008 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  23. Adsorption reaction of (CH3)2S on Pd nanoparticles with clean surface studied by in-situ XPS

    12th HiSOR International Symposium 2008 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  24. Decomposition of ethanol by alumina-supported Pd nanoparticle catalyst

    12th HiSOR International Symposium 2008 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  25. Fabrication and characterization of Rh(PVP) nanoparticle with isotope water (D2O)

    12th HiSOR International Symposium 2008 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  26. NEXAFS and XPS studies of bimetal Rh-Pd(PVP) nanoparticle

    12th HiSOR International Symposium 2008 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  27. Influence of coadsorbed water isotopomeres (H2O or D2O) on the adsorption behavior of (CH3)2S on Rh(100)

    12th HiSOR International Symposium 2008 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  28. XPS and AFM study of Rh deposited on Al2O3 thin film/NiAl(100)

    12th HiSOR International Symposium 2008 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  29. NEXAFS and EXAFS studies of Er nano structures on InP

    12th HiSOR International Symposium 2008 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  30. Overview of XAFS at HiSOR

    International Symposium on HiSOR 2008 

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    Event date: 2008.3

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

  31. 軟X線XAFSのナノ材料への応用

    八木伸也

    立命館大学SRセンター研究成果報告会 

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    Event date: 2008.6

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

    Country:Japan  

  32. Fabrication of metal nanoparticles and its characterization with synchrotron radiation International conference

    Pre-International Conference of 14th Congress on Catalysis 

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    Event date: 2008.7

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

  33. ビームラインワーキンググループの検討状況

    渡邉信久、八木伸也

    第4回シンクロトロン光利用者研究会企業とシンクロトロン光利用技術を繋ぐ ~コーディネーターの視点から~ 

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    Event date: 2008.9

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

    Country:Japan  

  34. 大気圧条件XAFS測定による生体アミノ酸と貴金属ナノ粒子の反応研究

    八木伸也

    第二回量子ビームによるナノバイオエレクトロニクス技術調査専門委員会 

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    Event date: 2008.11

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

    Country:Japan  

    軟X線領域のX線は大気成分によって大きく減弱する。よって、そのようなX線を利用する場合は超高真空条件での実験系を組む必要がある。しかしながら軽元素で、かつ系に対して不活性な希ガスのHeを用いた場合、大気圧条件下でのX線吸収微細造測定(XAFS)を実施することが可能である。このシステムにより、これまで軟X線領域での測定が困難とされていた「液相」のXAFS測定が簡単に行えるようになった。本公演では、生体アミノ酸であるシステインとRhナノ粒子の液相中での吸着反応について紹介した。さらに現在、愛知県で計画している「

  35. 大気圧条件XAFS測定によるそのまま試料、ウェット系試料の分析

    八木伸也

    シンクロトロン光利用者研究会(XAFSグループ) 

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    Event date: 2009.7

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

    Country:Japan  

    軟X線領域の放射光を利用したXAFS測定について、特にウェットな系に対しての測定手順や工夫について、最近得られたデータを織り込みながら解説した。

  36. 軟X線領域の放射光を用いた材料分析:中部シンクロトロンで何ができるか?

    八木伸也

    全豊田材料検討会分析部会表面分析ネットワーク 

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    Event date: 2008.12

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

    Country:Japan  

  37. 金属ナノ粒子の作製と軟X線領域の放射光を用いた化学状態分析

    八木伸也、小川智史、丹羽悠登、野本豊和、中西康次、太田俊明、アーリップ・クトゥルク、生天目博文、谷口雅樹

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    Event date: 2009.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  38. NEXAFS and XPS Studies of (CH3)2S Adsorption on Rh(PVP) Nanoparticle International conference

    ALC'09 (international symposium on atomic level characterization) 

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    Event date: 2009.12

    Language:English   Presentation type:Poster presentation  

  39. Fabrication and Characterization of Magnesium Nanoparticle by Gas Evaporation Method International conference

    ALC'09 (international symposium on atomic level characterization) 

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    Event date: 2009.12

    Language:English   Presentation type:Poster presentation  

  40. Surface Reaction of Ethanol on Alumina-supported Pd Nanoparticle Catalyst Studied by Pd L3-edge NEXAFS International conference

    ALC'09 (international symposium on atomic level characterization: Maui, Hawaii, 12/6-11) 

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    Event date: 2009.12

    Language:English   Presentation type:Poster presentation  

  41. 軟X線領域の放射光を用いてわかること --超高真空から大気圧条件まで--

    八木伸也

    知的クラスター創成事業 基礎教育プレセミナー 

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    Event date: 2009.3

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

    Country:Japan  

  42. Dissociation reaction of (CH3)2S on Rh(PVP) nanoparticlestudied by NEXAFS and XPS

    13th HiSOR international symposium 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  43. NEXAFS and XPS studies on sulfur poisoning of Pd/Mg6Ni

    13th HiSOR international symposium 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  44. Fabrication of Pd nanoparticle with clean surface and the dissociation reaction of dimethyl sulfide studied by in-situ XPS

    13th HiSOR international symposium 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  45. The reaction of L-cysteine in Rh(PVP) nanocolloidal solution studied by the He-path NEXAFS and CD

    13th HiSOR international symposium 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  46. Thermal behavior of Rh on θ-Al2O3/NiAl(100) studied by NEXAFS, XPS and AFM

    13th HiSOR international symposium 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  47. In-situ and ex-situ studies in surface reaction of (CH3)2S on Rh/Al2O3/NiAl(100)

    13th HiSOR international symposium 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  48. Atmospheric pressure XAFS measurements with He-path for industrial approaches

    13th HiSOR international symposium 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  49. 金属ナノ粒子の作製と軟X線XAFSによる分析

    八木伸也、小川智史、丹羽悠登、中西康次、野本豊和、Galif Kutluk、生天目博文、谷口雅樹、太田俊明

    第23回日本放射光学会年会(イーグレ姫路:1/6-9) 

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    Event date: 2010.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  50. Mgナノ粒子の作製及びその大気酸化による影響のXAFS分析

    小川智史、丹羽悠登、野本豊和、八木伸也、中西康次、太田俊明

    第23回日本放射光学会年会 

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    Event date: 2010.1

    Language:Japanese   Presentation type:Poster presentation  

    Country:Japan  

  51. Rh(PVP)ナノ粒子と硫化ジメチルの吸着反応に関する研究

    丹羽悠登、小川智史、八木伸也、Galif Kutluk、生天目博文、谷口雅樹

    第23回日本放射光学会年会 

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    Event date: 2010.1

    Language:Japanese   Presentation type:Poster presentation  

    Country:Japan  

  52. Adsorption reaction of L-Cysteine on Cu nanoparticle studied by S K-edge NEXAFS under water environment

    14th HiSOR international symposium 

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    Event date: 2010.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  53. Poisoning reaction of hydrogen storage material studied by NEXAFS

    14th HiSOR international symposium 

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    Event date: 2010.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  54. NEXAFS and XPS analyses of adsorption reaction of dimethyl sulfide on the Rh(PVP) nanoparticle surface

    14th HiSOR international symposium 

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    Event date: 2010.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  55. K- and L-edges NEXAFS measurements under atmospheric pressure condition at BL-3

    14th HiSOR international symposium 

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    Event date: 2010.3

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  56. 機能性ナノ粒子材料と放射光化学状態分析

    八木伸也

    HiSOR セミナー 

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    Event date: 2011.6

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

    Venue:広島大学放射光科学研究センター   Country:Japan  

  57. 大腸がんスクリーニングに向けたナノ粒子基盤材料の開発

    八木伸也

    第1回材料表面改質トライアルコア研究会 

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    Event date: 2012.1

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

    Venue:あいち産業科学総合技術センター(刈谷市)   Country:Japan  

  58. BL-10 水素吸蔵 Mg ナノ粒子のin-situ XAFS分析

    小川智史、八木伸也

    立命館大学SRセンター研究成果報告会 

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    Event date: 2012.6

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

    Venue:立命館大学びわこ・くさつキャンパス ローム記念館   Country:Japan  

  59. ナノ粒子の作製とその評価:アプリケーションへの展開を中心に

    八木伸也

    東北大学金属材料研究所研究会 

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    Event date: 2012.12

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

    Venue:東北大学金属材料研究所   Country:Japan  

  60. 軟X線XAFSを利用した材料開発研究について

    八木伸也

    シンクロトロン利用者研究会 

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    Event date: 2012.8

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

    Venue:あいちSRセンター会議室   Country:Japan  

  61. Fabrication and characterization of nanoparticles with synchrotron light International conference

    Shinya YAGI

    PIM International Conference 

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    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (keynote)  

    Country:Japan  

  62. 水素吸蔵材料への応用に向けたナノ材料の化学状態分析

    八木伸也、小川智史、塚田千恵、水谷剛士、藤本大志、金井友美、内山直樹

    第2回あいちSR成果報告会 

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    Event date: 2014.12

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

    Venue:あいち知の拠点   Country:Japan  

  63. He-pathを用いたNEXAFS法によるスクアレンの加硫反応に関する研究

    八木伸也

    第21回DV-Xα研究会 

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    Event date: 2014.8

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

    Venue:名古屋大学   Country:Japan  

  64. 非侵襲大腸がんスクリーニングキット開発に向けたRhナノ粒子の応用

    八木伸也

    第10回ナノ・バイオメディカル学会 

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    Event date: 2015.3

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

    Venue:名古屋大学エコトピア科学研究所会議室   Country:Japan  

  65. 非侵襲大腸がんスクリーニングキット開発に向けたRhナノ粒子の応用 International conference

    八木伸也

    第10回ナノ・バイオメディカル学会  2015.3.9  日本ナノ・バイオメディカル学会

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

    Venue:名古屋大学エコトピア科学研究所会議室  

  66. 水素吸蔵材料への応用に向けたナノ材料の化学状態分析 International conference

    八木伸也, 小川智史, 塚田千恵, 水谷剛士, 藤本大志, 金井友美, 内山直樹

    第2回あいちSR成果報告会  2014.12.5  愛知県

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

    Venue:あいち知の拠点  

  67. He-pathを用いたNEXAFS法によるスクアレンの加硫反応に関する研究 International conference

    八木伸也

    第21回DV-Xα研究会  2014.8.6  日本DV-Xα研究会

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

    Venue:名古屋大学  

  68. Fabrication and characterization of nanoparticles with synchrotron light

    Shinya YAGI

    PIM International Conference  2013.9.25 

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    Language:English   Presentation type:Oral presentation (keynote)  

  69. ナノ粒子の作製とその評価:アプリケーションへの展開を中心に International conference

    八木伸也

    東北大学金属材料研究所研究会  2012.12.17  東北大学金属材料研究所研究会

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

    Venue:東北大学金属材料研究所  

  70. 軟X線XAFSを利用した材料開発研究について International conference

    八木伸也

    シンクロトロン利用者研究会  2012.8.2  愛知県

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

    Venue:あいちSRセンター会議室  

  71. BL-10 水素吸蔵 Mg ナノ粒子のin-situ XAFS分析 International conference

    小川智史, 八木伸也

    立命館大学SRセンター研究成果報告会  2012.6.9  立命館大学SRセンター

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

    Venue:立命館大学びわこ・くさつキャンパス ローム記念館  

  72. 大腸がんスクリーニングに向けたナノ粒子基盤材料の開発 International conference

    八木伸也

    第1回材料表面改質トライアルコア研究会  2012.1.16  愛知県

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

    Venue:あいち産業科学総合技術センター(刈谷市)  

  73. 機能性ナノ粒子材料と放射光化学状態分析 International conference

    八木伸也

    HiSOR セミナー  2011.6.9  広島大学放射光科学研究センター

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

    Venue:広島大学放射光科学研究センター  

  74. 小型放射光源の産業利用ーー谷口・マツダプロジェクトーー

    広島大学

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

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Research Project for Joint Research, Competitive Funding, etc. 9

  1. 燃料電池材料の化学状態分析

    2015.7

    企業からの受託研究 

  2. 新規太陽電池材料のXAFS分析による開発

    2011.4 - 2014.3

    国内共同研究 

  3. 腸内ガス分析に適した貴金属ナノ粒子機能薄膜の医療応用

    2007.7 - 2008.2

    研究成果活用プラザ 

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    Grant type:Competitive

    地域イノベーション創出総合支援事業重点地域研究開発推進プログラム「シーズ発掘試験」

  4. 水素吸蔵合金材料の開発とその化学状態分析

    2007.4

    企業からの受託研究 

  5. 生体由来の含硫黄分子分析とガン検出に関する医療応用

    2006.8 - 2007.2

    研究成果活用プラザ東海 

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    Grant type:Competitive

    地域イノベーション創出総合支援事業重点地域研究開発推進プログラム「シーズ発掘試験、平成18年度」

  6. 貴金属超微粒子を用いたナノホール構造薄膜作製とディーゼル排ガス浄化触媒への応用

    2005.10 - 2006.2

    研究成果活用プラザ東海 

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    Grant type:Competitive

    プラザ育成研究調査課題採択(F/S研究調査)(平成17年度)  研究成果活用プラザ東海

  7. コロイド溶液中の貴金属ナノ粒子触媒の化学状態分析

    2005.4 - 2007.4

    企業からの受託研究 

  8. 研究成果活用プラザ広島における「事業化のための育成研究」: 『放射光を利用したガス吸脱反応の計測・制御による排ガス浄化触媒の高性能化』

    2002 - 2005

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    Grant type:Competitive

  9. Molecular Knife-Controlof Chemical Reaction by Core Excitation

    1998 - 2003

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KAKENHI (Grants-in-Aid for Scientific Research) 8

  1. 硫黄被毒したナノ粒子の水素吸放出特性のがん検知への応用

    2014.4 - 2017.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  2. 浄化機能を有した複合材料の創製を目指した有機分子/金属超微粒子の研究

    2003 - 2006

    科学研究費補助金  基盤研究(B),課題番号:15360358

    八木 伸也

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    Authorship:Principal investigator 

  3. Fabrication of novel nanoparticle with micro-bubble by solution plasma method

    2016.4 - 2018.3

    Grant-in-Aid for Scientific Research 

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    Authorship:Principal investigator 

  4. Synthesize of magnetic nano particles based on information of chemical reaction behavior by electron microscopy and synchrotron, characteristic prediction

    Grant number:21K04843  2021.4 - 2024.3

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

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    Authorship:Coinvestigator(s) 

  5. Fabrication of novel nanoparticles by solution plasma method and micro-bubbles

    Grant number:16K14402  2016.4 - 2018.3

    Yagi Shinya

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    Authorship:Principal investigator 

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

    In this year, we have produced "nano-bubbles" using oxygen gas and attempted to fabricate the gold nanoparticles under the environment existing oxygen nano-bubbles. Furthermore, we have found that the adsorbed oxygen on the gold nanoparticles prepared by the solution plasma method was in the ionic state by HAXPES measurement in SPring-8. However, an information on more oxygen atoms adsorbed on the surface of gold nanoparticles fabricated with oxygen nano-bubbles could not be obtained. In the future, we plan to optimize the solution temperature and/or the bubble density.

  6. Fabrication of novel nanoparticle with micro-bubble by solution plasma method

    2016.4 - 2018.3

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

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    Authorship:Principal investigator  Grant type:Competitive

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

    Grant number:26289255  2014.4 - 2017.3

    Yagi Shinya

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    Authorship:Principal investigator 

    Grant amount:\16120000 ( Direct Cost: \12400000 、 Indirect Cost:\3720000 )

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

  8. 硫黄被毒したナノ粒子の水素吸放出特性のがん検知への応用

    2014.4 - 2017.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    吉田朋子

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    Grant type:Competitive

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Industrial property rights 2

  1. X線吸収微細構造(XAFS)の測定法

    住田弘祐、三輪能久、アーリップ・クトゥルク、八木伸也、生天目博文、谷口雅樹

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    Application no:特願2004-111274  Date applied:2004.4

    Announcement no:特開2005-292085(P2005-292085A) 

    Patent/Registration no:特願2004-111274 

    Country of applicant:Domestic  

  2. 金属ナノ粒子作製方法

    八木伸也、アーリップ・クトゥルク、生天目博文、谷口雅樹、住田弘祐、定井麻子

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    Application no:特願2004-210618  Date applied:2004.7

    Announcement no:特開2006-26561(P2006-26561A) 

    Patent/Registration no:特願2004-210618 

    Country of applicant:Domestic  

 

Teaching Experience (On-campus) 10

  1. 量子ビーム物性工学特論

    2011

  2. 量子力学A

    2000

  3. 量子力学A

    2001

  4. 量子力学A

    2002

  5. 総合科目:ナノテクノロジー「基礎から最先端まで」

    2002

  6. 総合科目:ナノテクノロジー「基礎から最先端まで」

    2003

  7. 量子力学B

    2003

  8. 表面・界面制御工学Ⅱ

    2003

  9. 量子力学A

    2004

  10. First Year Seminar A

    2011

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Teaching Experience (Off-campus) 3

  1. 軟X線領域のシンクロトロン光を用いた産業応用へのヒント

    2007.4 - 2008.3 愛知県産業技術研究所・刈谷)

  2. 軟X線領域の放射光を如何に活用するか?

    2008.4 - 2009.3 全豊田表面分析ネットワーク講演会)

  3. 放射光科学特論

    2017.4 - 2018.3 Hiroshima University)

 

Social Contribution 2

  1. 高校出前講義

    2008.4

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    毎年1-2校の高等学校へ出向き、量子エネルギー工学コースの説明や自身の研究についての解説を行う。(物理工学科、量子エネルギー工学コース所属の教員で分担するものである)

  2. XAFS利用研究会

    2009.4

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    中部シンクロトロン光施設(仮称)のXAFSビームラインを使用することを検討されている企業の研究者を対象に、「XAFSでわかること」や「XAFS測定をするためには」等について座学と実習体験を行います。