Investigation of superhydrophilic mechanism of titania nano layer thin film—Silica and indium oxide dopant effect |
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| Authors: | AKBAR ESHAGHI AMENEH ESHAGHI |
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| Affiliation: | 1. Faculty of Materials Science and Engineering, Maleke Ashtar University of Technology, Isfahan, Shahinshahr, Iran
2. Sari branch, Islamic Azad University, Sari, Iran
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| Abstract: | In this paper, TiO2?CSiO2?CIn2O3 nano layer thin films were deposited on glass substrate using sol?Cgel dip coating method. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and water contact angle measurements were used to evaluate chemical structure, surface composition, hydroxyl group contents and superhydrophilicity of titania films. FTIR result indicated that Si?CO?CSi, Si?CO?CTi and Ti?CO?CTi bands formed in TiO2?CSiO2?CIn2O3 sample. According to XPS, the hydroxyl content for TiO2, TiO2?CSiO2 and TiO2?CSiO2?CIn2O3 films was calculated as 11·6, 17·1 and 20·7%, respectively. The water contact angle measurements indicated that silica and indium oxide dopant improved the superhydrophilicity of titania nano film surface especially in a dark place. The enhanced superhydrophilicity can be related to the generation of surface acidity on the titania nano film surfaces. In the present state, superhydrophilicity is induced by the simultaneous presence of both Lewis and Bronsted sites. |
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