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Preparation and Characterization of Nanocrystalline TiO2 Thin Films Prepared By Sol-Gel Spin Coating Method

T.Ranganayaki, M.Venkatachalam, T.Vasuki , S. Shankar

Titanium dioxide(TiO2)thin films were synthesized via sol-gel spin coating method using titanium tetra isopropoxide (TTIP) as starting material. TTIP is dissolved in ethanol stabilized by glacial acetic acid. TiO2 thin films were prepared for different proportions of acetic acid. The prepared samples were dried at 250°C for 5minutes then annealed at 500°C for 1hr. The structural properties were investigated by using X-ray diffraction technique and grain size was calculated. Elemental analysis and surface morphology were studied using EDX spectrum and SEM micrograph. Absorbance spectra were measured by using UV-Vis spectrophotometer and the optical band gap was calculated. The crystalline size of TiO2 thin films obtained is ~19.67nm.