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Preparation and Characterization of Sol–Gel Spin Coated Nanocrystalline TiO2 Films

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Abstract:

Titanium dioxide (TiO2 thin films with nanocrystallites have been prepared using sol–gel spin coating technique. HRTEM studies indicated that the films are composed of small grains having an average size of 20 nm. Transmittance spectra has been recorded for the spin coated TiO2 films and red shift of absorption edge on annealing has been observed. The optical band gap determined using the transmittance spectra revealed that the band gap decreased from 3.71 to 3.19 eV on annealing. The photoluminescence measurements of the TiO2 films showed a visible broad luminescence band in the region of 350 to 550 nm which can be ascribed to the presence of defect states.

Keywords: ELECTRON MICROSCOPY; SOL–GEL GROWTH; TIO2 THIN FILMS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/asl.2011.1913

Publication date: November 1, 2011

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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