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Photocatalytic activity and photo-induced superhydrophilicity of sol–gel derived TiO2 films

Paper ID Volume ID Publish Year Pages File Format Full-Text
28535 44080 2006 12 PDF Available
Title
Photocatalytic activity and photo-induced superhydrophilicity of sol–gel derived TiO2 films
Abstract

TiO2 thin films have been deposited using various sol–gel routes. X-ray diffraction, ellipsometry, atomic force microscopy, and scanning electron microscopy characterizations show that the film morphology is strongly influenced by the sol nature and post-deposition heat-treatment temperature. Photo-induced properties of the films have been studied in relation to their morphology. In aqueous medium, photocatalytic properties are governed by a migration of photo-generated charge carriers, which occurs through the whole film thickness and closely depends on the film morphology, in particular the crystallization and densification degrees, as well as the primary and secondary particle sizes. Correlations between photocatalytic activity and photo-induced superhydrophilicity show that both properties are influenced by same mechanisms. Photo-wettability mechanisms are less critically influenced by morphologic properties because they only involve a very thin active surface layer.

Keywords
Sol–gel thin films; Titanium oxide; Photocatalysis; Photo-induced superhydrophilicity
First Page Preview
Photocatalytic activity and photo-induced superhydrophilicity of sol–gel derived TiO2 films
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 181, Issues 2–3, 31 July 2006, Pages 203–214
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering