Abstract
Titania [TiO2] thin films having different ratios of anatase and rutile crystalline phases were fabricated on glass substrates by sol-gel method by dip coating technique. The crystalline phase and microstructure were analyzed by X-Ray diffraction, Raman spectroscopy and Scanning Electron Microscopy. The crystalline phase of TiO2 is dependent on film thickness. Beyond a film thickness of ∼240nm, crystallization of small amounts of rutile phase is observed. Thin films containing different ratios of anatase and rutile phases were prepared by controlling the film thickness. The influence of film thickness on their photocatalytic activity was studied. The heterophase TiO2 thin films with a thickness of 450 nm and containing anatase: rutile ratio of 70:30 was found to exhibit highest photocatalytic degradation of methylene blue under UV light illumination.
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