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Photocatalysis of Columnar TiO2 Thin Films

Published online by Cambridge University Press:  01 February 2011

Motofumi Suzuki ,
Kazuaki Kishimoto ,
Wataru Maekita ,
Kaoru Nakajima  and
Kenji Kimura
Motofumi Suzuki
Affiliation:
Department of Engineering Science and Mechanics, Kyoto University, Kyoto 606–8501, JAPAN
Kazuaki Kishimoto
Affiliation:
Department of Engineering Science and Mechanics, Kyoto University, Kyoto 606–8501, JAPAN
Wataru Maekita
Affiliation:
Department of Engineering Science and Mechanics, Kyoto University, Kyoto 606–8501, JAPAN
Kaoru Nakajima
Affiliation:
Department of Engineering Science and Mechanics, Kyoto University, Kyoto 606–8501, JAPAN
Kenji Kimura
Affiliation:
Department of Engineering Science and Mechanics, Kyoto University, Kyoto 606–8501, JAPAN
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Abstract

Photocatalysis of oblique columnar TiO2 thin films has been investigated as a function of thickness using photobleaching of methylene blue (MB). The degradation rate of MB depends on the thickness of the films, although no significant differences in the columnar morphology, crystallinity and optical absorption are found. The relation between the degradation rate and the thickness is well described by a simple model, in which the degradation rate at a certain depth is proportional to the intensity of ultra violet (UV) light. The photocatalytic active thickness is estimated at approximately 200 nm. Thus the interior surface of the oblique columnar TiO2 thin films works well as photocatalyst.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 849: Symposium KK – Kinetics-Driven Nanopatterning on Surfaces , 2004 , KK8.7
Copyright
Copyright © Materials Research Society 2005

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References

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