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Visible-Light Photocatalysis in Nitrogen-Doped Titanium Oxides
R. Asahi,*T. Morikawa,T. Ohwaki,K. Aoki,Y. Taga
To use solar irradiation or interior lighting efficiently, we
sought a photocatalyst with high reactivity under visible light.Films
and powders of TiO2-xNx
have revealedan improvement over titanium dioxide
(TiO2) under visible light(wavelength < 500 nanometers) in optical absorption and photocatalyticactivity
such as photodegradations of methylene blue and gaseousacetaldehyde
and hydrophilicity of the film surface. Nitrogendoped into
substitutional sites of TiO2 has proven to be indispensablefor band-gap narrowing and photocatalytic activity, as assessedby
first-principles calculations and x-ray photoemission spectroscopy.
Toyota Central R&D Laboratories, Nagakute, Aichi 480-1192, Japan.
*
To whom correspondence should be addressed. E-mail:
rasahi{at}mosk.tytlabs.co.jp
The editors suggest the following Related Resources on Science sites:
In Science Magazine
LETTERS
Shinri Sato;, R. Asahi, T. Morikawa, T. Ohwaki, K. Aoki, and Y. Taga (25 January 2002) Science295 (5555), 626.
[DOI: 10.1126/science.295.5555.626] |Full Text »
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Visible-Light-Induced Bactericidal Activity of a Nitrogen-Doped Titanium Photocatalyst against Human Pathogens.
