Abstract
Nanocrystalline thin films of TiO2 have been synthesized by sol gel spin coating technique Thin films of TiO2 annealed at 700 °C were characterized by X-ray diffraction(XRD), Atomic Force Microscopy, High resolution TEM and Scanning Electron Microscopy (SEM), The XRD shows formation of tetragonal anatase and rutile phases with lattice parameters a = 3.7837 A and c = 9.5087 A. The surface morphology of the TiO2 films showed that the nanoparticles are fine with an average grain size of about 60 nm. Optical studies revealed a high absorption coefficient (104 cm−1) with a direct band gap of 3.24 eV. The films are of the n type conduction with room temperature electrical conductivity of 10−6 (Ω cm)−1.
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