期刊
CATALYSIS TODAY
卷 143, 期 3-4, 页码 347-354出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2008.09.037
关键词
TiO2; Photo-catalytic activity; Wetting angle; Thin films
资金
- Spanish ministry for Science and innovation [MAT2007-65764]
- Junta de Andalucia [TEP2275]
- EU [NATAMA 032583]
TiO2 thin films have been prepared by physical vapour deposition (PVD) and plasma enhanced chemical vapour deposition (PECVD) to study the UV-induced photo-activity of this material. Wetting angle variations and photo-catalytic activity for the degradation of dyes upon UV illumination have been compared for thin films with different crystalline structure (amorphous, rutile and anatase), microstructure (columnar, compact, etc.) and porosities as estimated from the Values of their refraction indices and their direct assessment with a quartz crystal monitor. The surface of the thin films became superhydrophilic upon UV light irradiation and then it recovered its original state by keeping the samples in the dark. Wetting angle decays follow very similar kinetics for amorphous and crystalline films, independently of their actual porosities. By contrast the photo-catalytic activity was very dependent on the crystalline structure of the films (anatase > rutile > amorphous) and on their porosities. The different behaviour depicted by the films with regard to these two properties suggests that they respond to different though related mechanisms and that they cannot be considered as equivalent when trying to prove the photo-activity of TiO2. (C) 2008 Published by Elsevier B.V.
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