Abstract
To characterize a photo-catalytic SiO2/TiO2 multilayer film prepared by vacuum-deposition method, kinetic measurements of the photo-catalytic activity were carried out, and the interface structure and photo-conductivity of the film were also investigated. By the kinetic analyses of self-cleaning of stearic acid and de-colorization of methylene blue, it was proved that the SiO2/TiO2 multilayer film with the 20nm set-thick SiO2 overlayer exhibited an improved photo-catalytic activity as compared to the TiO2 film. The multilayer film had a heterogeneous interface structure, whereas the photo-catalytic reaction seemed to occur on the photo-catalytically inactive SiO2 surface. A sufficient overlaying by the SiO2 thin film on the TiO2 film improved the photo-catalytic properties of the film. The multilayer film with improved photo-catalytic activity exhibited a significantly increased photocurrent compared to a TiO2 film. Both improved photo-catalytic activity and photocurrent amplification of the multilayer film might be strongly correlated to an increase of photo-generated carriers at the interface of the film. A nanometer-sized insulating overlayer can synergistically form integration to improve photo-catalytic activity, an attractive function for photocurrent amplification of the multilayer film.
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