Keisuke Asai

Band gap narrowing of titanium dioxide by sulfur doping

T. Umebayashi, Tetsuya Yamaki, H. Itoh et al. · Applied Physics Letters · 2002 · 1.4K citations

Materials Science, Oxide Heterostructures, Materials Engineering +11

Preparation of S-doped TiO2 photocatalysts and their photocatalytic activities under visible light

Teruhisa Ohno, Miyako Akiyoshi, T. Umebayashi et al. · Applied Catalysis A General · 2004 · 1.3K citations

Materials Science, Chemical Engineering, Photocatalytic Activities +12

Visible Light-Induced Degradation of Methylene Blue on S-doped TiO2

T. Umebayashi, Tetsuya Yamaki, Sigeru Tanaka et al. · Chemistry Letters · 2003 · 524 citations

Materials Science, Engineering, Titanium Dioxide +14

Electronic structures of lead iodide based low-dimensional crystals

T. Umebayashi, Keisuke Asai, Takashi Kondo et al. · Physical review. B, Condensed matter · 2003 · 519 citations

Materials Science, Transition Metal Chalcogenides, Engineering +13

Sulfur-doping of rutile-titanium dioxide by ion implantation: Photocurrent spectroscopy and first-principles band calculation studies

T. Umebayashi, Tetsuya Yamaki, Shunya Yamamoto et al. · Journal of Applied Physics · 2003 · 300 citations

Rutile-titanium Dioxide, Optical Materials, Engineering +19