R
Ryoji Asahi
Researcher at Toyota
Publications - 168
Citations - 20021
Ryoji Asahi is an academic researcher from Toyota. The author has contributed to research in topics: Thermoelectric effect & Thermoelectric materials. The author has an hindex of 36, co-authored 163 publications receiving 18376 citations. Previous affiliations of Ryoji Asahi include Toyota Technological Institute & Northwestern University.
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Visible-Light Photocatalysis in Nitrogen-Doped Titanium Oxides
TL;DR: Film and powders of TiO2-x Nx have revealed an improvement over titanium dioxide (TiO2) under visible light in optical absorption and photocatalytic activity such as photodegradations of methylene blue and gaseous acetaldehyde and hydrophilicity of the film surface.
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Nitrogen-doped titanium dioxide as visible-light-sensitive photocatalyst: designs, developments, and prospects.
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Optically tunable amino-functionalized graphene quantum dots
Hiroyuki Tetsuka,Ryoji Asahi,Akihiro Nagoya,Kazuo Okamoto,Ichiro Tajima,Riichiro Ohta,Atsuto Okamoto +6 more
TL;DR: Amino-functionalized graphene quantum dots with discrete molecular weights and specific edges were self-limitedly extracted from oxidized graphene sheet and exhibit bright colorful fluorescence under a single-wavelength excitation.
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Electronic and optical properties of anatase TiO 2
TL;DR: In this article, the full-potential linearized augmented plane-wave method has been used to investigate detailed electronic and optical properties of anatase in the structure, and the fully optimized structure obtained by minimizing the total energy and atomic forces are in good agreement with experiment.
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Band-Gap Narrowing of Titanium Dioxide by Nitrogen Doping
TL;DR: In this article, a significant shift of the absorption edge to a lower energy in the visible-light region has been observed, and the substitutional doping of N into the TiO2 lattice is found to be effective; its 2p states contribute to the band-gap narrowing by mixing with O 2p as shown in ab initio electronic structure calculations.