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Photocatalytic activity of needle-like TiO2/WO3-x thin films prepared by chemical vapour deposition

Cabrera, RQ; Latimer, ER; Kafizas, A; Blackman, CS; Carmalt, CJ; Parkin, IP; (2012) Photocatalytic activity of needle-like TiO2/WO3-x thin films prepared by chemical vapour deposition. Journal of Photochemistry and Photobiology A: Chemistry , 239 pp. 60-64. 10.1016/j.jphotochem.2012.05.002.

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Abstract

The enhanced photocatalytic activity of needle-like TiO2/WO3−x (0 < x ≤ 0.3) composite thin films is demonstrated in the degradation of stearic acid, a model system for the organic pollutants typically present on window surfaces. The films were synthesised by atmospheric pressure chemical vapour deposition (APCVD) from reaction of tungsten and titanium chlorides with ethanol and ethyl acetate as oxygen sources, respectively, and characterised by X-ray diffraction, Raman spectroscopy, SEM and AFM. The increase in activity of films is explained in terms of an effective vectorial charge separation at the interface of the two oxide semiconductors. The interaction of water with the surface of the TiO2/WO3−x composite film is also discussed after water droplet contact angle measurements.

Type: Article
Title: Photocatalytic activity of needle-like TiO2/WO3-x thin films prepared by chemical vapour deposition
DOI: 10.1016/j.jphotochem.2012.05.002
Publisher version: http://dx.doi.org/10.1016/j.jphotochem.2012.05.002
Language: English
Keywords: Semiconductor photocatalyst, TiO2/WO3-x composite, Morphology control, Needles, Thin film, Chemical vapour deposition, VISIBLE-LIGHT IRRADIATION, WO3/TIO2 FILMS, STEARIC-ACID, TIO2, PRESSURE, WO3, GLASS, OXIDATION, PROPERTY, ANATASE
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
URI: http://discovery.ucl.ac.uk/id/eprint/1360585
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