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SYNTHESIS AND CHARACTERIZATION OF THIN FILMS OF PURE TIO 2 AND SR-DOPED TIO 2 PREPARED BY SPIN COATING TECHNIQUE

ABSTRACT: Transparent thin films of pure TiO2 and 3% Sr-doped TiO2 (Ti0.97 Sr0.03O2) were prepared by spin coating technique onto well-cleaned glass substrate. These films were annealed at different temperatures. The structural analysis by GIXRD and Raman Spectroscopy confirms the anatase phase of TiO2. The study also shows dependence of structural parameters and crystallinity on the annealing temperature of films. Surface morphology of the prepared films studied using Atomic Force Microscopy (AFM) exhibits a homogeneous globular structure. The UV-Visible analysis shows decrease in the optical band gap of the films annealed at higher temperatures. The UV spectra also show good absorbance of UV radiation in the wavelength range of 300 nm to 400 nm. Photoluminescence (PL) study shows variation in the emission peaks for films annealed at different temperature and for those with different concentrations of strontium (Sr). The dielectric properties, gas sensitivity, wettability and self-cleaning property of the prepared films were also studied and the results are discussed in details.