Abstract
ABSTRACT Transparent TiO 2 films in various thicknesses were prepared by sol‐gel and MOCVD method, respectively, and their photocatalytic activities in decomposing gaseous 2‐propanol were evaluated. The surfaces and grain structures of the prepared films were characterized by FESEM, XRD, and AFM. It was found that the photocatalytic activities of TiO 2 films were greatly dependent on the film thickness and surface roughness: The photocatalytic activity increases with the increase of film thickness, while it decreases with the increase of surface roughness. We have proposed that these phenomena originate from the transfer of photogenerated electron and hole pairs from the bulk to the surface of TiO 2 film. Several experimental evidences supporting this mechanism have also been provided. INTRODUCTION TiO 2 photocatalysts in thin film form have promising industrial applications for the elimination of organic pollutants in aqueous solution or in gas phase, and they are also well‐known as self‐cleaning and super‐hydrophilic smart materials working under an irradiation of light.
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