The Mechanisms on the Transmittance and Photo-Catalytic Activity of TiO2 Film Doped with SiO2/PEG

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TiO2 sol was doped with SiO2 and modified by adding PEG. Using the sol the self-cleaning antireflective films were prepared with dip-pulling method. Field emission scanning electron microscope (FESEM) test results showed that the TiO2-SiO2 film surface distributed a large number of pores and grooves. The visible spectrophotometer testing found that the transmittance showed a decreasing trend with the increase of TBTT: TEOS ratio. Meanwhile, the photo-catalytic efficiency showed an increase firstly and then decreased with the TBTT: TEOS ratio increasing. When the ratio of TBTT: TEOS was 1:5, the films transmittance and the photo-catalytic efficiency can reach up to 97.1% and 13.5% respectively. The mechanisms on the transmittance and photo-catalytic activity of PEG-modified TiO2-SiO2 films were studied. It was found that PEG-modified TiO2-SiO2 films have higher porosity, transmittance and hydrophilicity than pure TiO2 film. Furthermore, photo-catalytic activity of the TiO2-SiO2 film was enhanced.

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435-438

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September 2013

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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