論文

• KENICHI OZAWA, Susumu Yamamoto, Kazuhiko Mase, Iwao Matsuda. A Surface Science Approach to Unveiling the TiO2 Photocatalytic Mechanism: Correlation between Photocatalytic Activity and Carrier Lifetime, e-Journal of Surface Science and Nanotechnology, Japan Society of Vacuum and Surface Science, Vol. 17, pp. 130-147, Sept. 2019.
• Y. Yokoyama, K. Kawakami, Y. Hirata, K. Takubo, K. Yamamoto, K. Abe, A. Mitsuda, H. Wada, T. Uozumi, S. Yamamoto, I. Matsuda, S. Kimura, K. Mimura, H. Wadati. Photoinduced valence dynamics in EuNi2(Si0.21Ge0.79)2 studied via time-resolved x-ray absorption spectroscopy, Physical Review B, 100, 115123, Sept. 2019.  公式リンク  
  
• Roya Liu, KENICHI OZAWA, Naoya Terashima, Yuto Natsui, Baojie Feng, Suguru Ito, Wei-Chuan Chen, Cheng-Maw Cheng, Susumu Yamamoto, Hiroo Kato, Tai-Chang Chiang, Iwao Matsuda. Controlling the surface photovoltage on WSe2 by surface chemical modification, Applied Physics Letters, American Institute of Physics, Vol. 112, May 2018.
• Kenichi Ozawa, Susumu Yamamoto, Ryu Yukawa, Ro-Ya Liu, Naoya Terashima, Yuto Natsui, Hiroo Kato, Kazuhiko Mase, Iwao Matsuda. Correlation between Photocalatytic Activity and Carrier Lifetime: Acetic Acid on Single-Crystal Surfaces of Anatase and Rutile TiO2, Journal of Physical Chemistry C, American Chemical Society, Vol. 122, pp. 9562-9569, Apr. 2018.
• Kenichi Ozawa, Susumu Yamamoto, Ryu Yukawa, Roya Liu, Masato Emori, Koki Inoue, Taku Higuchi, Hiroshi Sakama, Kazuhiko Mase, Iwao Matsuda. What Determines the Lifetime of Photoexcited Carriers on TiO2 Surfaces?, The Journal of Physical Chemistry C, American Chemical Society, Vol. 120, pp. 29283-29289, Dec. 2016.  公式リンク  
  
• Y Kubota, K Murata, J Miyawaki, K Ozawa, MC Onbasli, T Shirasawa, B Feng, Sh Yamamoto, RY Liu, S Yamamoto, SK Mahatha, P Sheverdyaeva, P Moras, CA Ross, S Suga, Y Harada, KL Wang, I Matsuda. Interface electronic structure at the topological insulator–ferrimagnetic insulator junction, Journal of Physics: Condensed Matter, IOP Publishing, Vol. 29, No. 5, Dec. 2016.  公式リンク  
  
• R. Yukawa, KENICHI OZAWA, S. Yamamoto, H. Iwasawa, K. Shimada, E. F. Schwier, K. Yoshimatsu, H. Kumigashira, H. Namatame, M. Taniguchi, I. Matsuda. Photon-dressed two-dimensional carriers on the ZnO surface, Physical Review B - Condensed Matter and Materials Physics, American Physical Society, Vol. 94, p. 165313, Oct. 2016.  公式リンク  
  
• Ryu Yukawa, Susumu Yamamoto, Kazuma Akikubo, Kaori Takeuchi, Kenichi Ozawa, Hiroshi Kumigashira, Iwao Matsuda. Tailoring Photovoltage Response at SrRuO3/SrTiO3 Heterostructures, Advanced Materials Interfaces, John Wiley & Sons, Inc., Vol. 3, No. 22, Sept. 2016.  公式リンク  
  
• Kenichi Ozawa, Susumu Yamamoto, Ryu Yukawa, Kazuma Akikubo, Masato Emori, Hiroshi Sakama, Iwao Matsuda. Capturing transiently charged states at the C60/TiO2(110) interface by time-resolved soft X-ray photoelectron spectroscopy, Organic Electronics, Elsevier B.V., Vol. 31, pp. 98-103, Jan. 2016.  公式リンク  
  
• R. Yukawa, K. Ozawa, S. Yamamoto, Roya Liu, I. Matsuda. Anisotropic effective mass approximation model to calculate multiple subband structures at wide-gap semiconductor surfaces: Application to accumulation layers of SrTiO3 and ZnO, Surface Science, Elsevier B.V., Vol. 641, pp. 224-230, July 2015.  公式リンク  
  
• R. Yukawa, S. Yamamoto, K. Ozawa, M. Emori, M. Ogawa, Sh. Yamamoto, K. Fujikawa, R. Hobara, S. Kitagawa, Hiroshi Daimon, H. Sakama, I. Matsuda. Electron-hole recombination on ZnO(0001) single-crystal surface studied by time-resolved soft X-ray photoelectron spectroscopy, Applied Physics Letters, AIP Publishing, Vol. 105, p. 151602, Oct. 2014.  公式リンク  
  
• KENICHI OZAWA, Masato Emori, Susumu Yamamoto, Ryu Yukawa, Shingo Yamamoto, Rei Hobara, Kazushi Fujikawa, Hiroshi Sakama, Iwao Matsuda. Electron-Hole Recombination Time at TiO2 Single-Crystal Surfaces: Influence of Surface Band Bending, Journal of Physical Chemistry Letters, American Chemical Society, Vol. 5, pp. 1953-1957, May 2014.  公式リンク  
  
• R. Yukawa, S. Yamamoto, K. Ozawa, M. D'Angelo, Manami Ogawa, M.G. Silly, F. Sirotti, I. Matsuda. Electronic structure of the hydrogen-adsorbed SrTiO3(001) surface studied by polarization-dependent photoemission spectroscopy, Physical Review B, American Physical Society, Vol. 87, p. 115314, Mar. 2013.  公式リンク  
  
• M. D'Angelo, R. Yukawa, K. Ozawa, S. Yamamoto, T. Hirahara, S. Hasegawa, M.G. Silly, F. Sirotti, I. Matsuda. Hydrogen-induced surface metallization of SrTiO3(001), Physical Review Letters, Vol. 108, p. 116802, Mar. 2012.  公式リンク  
  

国際会議発表 (査読有り)

• KENICHI OZAWA, Susumu Yamamoto, Marie D'angelo, Yuto Natsui, Naoya Terashima, Kazuhiko Mase, Iwao Matsuda. Enhanced Photoresponsivity of Fullerene in the Presence of Phthalocyanine: A Time-Resolved X-ray Photoelectron Spectroscopy Study of Phthalocyanine/C60/TiO2(110), Journal of Physical Chemistry C, America Chemical Society, Vol. 123, pp. 4388-4395, Jan. 2019.

研究ハイライト

• 小澤健一, 松田巌, 山本達, 坂間弘. 二酸化チタンの光触媒活性を決める因子を発見 －高効率光触媒開発に新たな指針－. 2012～2016. ●背景
  　光触媒材料として利用される二酸化チタン（TiO2）には，ルチル型とアナターゼ型がある。このうちアナターゼ型はルチル型より触媒活性が高いことが知られているが，その違いを生み出す要因は不明だった....
  

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