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    • Investigation of superhydrophilic mechanism of titania nano layer thin film—Silica and indium oxide dopant effect

      Akbar Eshaghi Ameneh Eshaghi

      Volume 35 Issue 2 April 2012 pp 137-142

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/035/02/0137-0142

    • Keywords

       

      TiO2; sol–gel method; surface acidity; superhydrophilicity.

    • Abstract

       

      In this paper, TiO2–SiO2–In2O3 nano layer thin films were deposited on glass substrate using sol–gel 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–O–Si, Si–O–Ti and Ti–O–Ti bands formed in TiO2–SiO2–In2O3 sample. According to XPS, the hydroxyl content for TiO2, TiO2–SiO2 and TiO2–SiO2–In2O3 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.

    • Author Affiliations

       

      Akbar Eshaghi1 Ameneh Eshaghi2

      1. Faculty of Materials Science and Engineering, Maleke Ashtar University of Technology, Isfahan, Shahinshahr, Iran
      2. Sari branch, Islamic Azad University, Sari, Iran

    • Dates

       
      Published
      April 2012
      Manuscript received
      2 March 2011
      Manuscript revised
      9 May 2011

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