Titanium dioxide thin films have been prepared from the solution of TTIP (Titanium Tetra Isopropoxide), Acetic acid and Ethanol on the glass substrates by sol-gel spin coating technique. In the present work, the TiO 2 thin films have been analyzed for different coating cycles which were annealed at 450° C for one hour. The annealed films were characterized by X-Ray diffraction (XRD) method, UV-Visible & Photoluminescence (PL) spectroscopy, Field Effect Scanning Electron Microscopy (FESEM) and Energy Dispersive X-Ray Analysis (EDAX).The XRD results show that the crystallite size increases from 6.3 nm to 35.5 nm with increase in number of coating cycles. The transmittance of the film and the optical band gap are found to decrease with increase in number of coating cycles. The room temperature PL spectra of TiO 2 thin films show blue and green emissions at 485 nm and 530 nm with excitation at 410 nm. The surface morphology shows rough surface with irregular particles. The stoichiometric ratio of the film was confirmed by EDAX analysis. The results of structural and optical characteristic study suggest that the sol-gel spin coated nanocrystalline TiO 2 thin films can have high potential application in photo catalytic activities.

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Titanium Dioxide (Ti02) thin films have been prepared from solution of TTIP (Titanium Tetra Isopropoxide), acetic acid and ethanol on glass substrates by sol-gel dip coating technique. The films coated for different coating cycles were annealed at a temperature of 450·C for one hour. The annealed films were characterized by X -Ray diffraction (XRD) method, UV -Visible and Photoluminescence (PL) spectroscopy, Field Effect Scanning Electron Microscopy (FESEM) and Energy Dispersive X -Ray Analysis (EDAX). From XRD analysis, the crystallite size was found to increase from 19.4 nm to 71.3 nm and the phase changes from anatase to rutile with increase in the number of coating cycles. The Ti02 thin films have high transparency in the visible range.The transmittance and the optical band gap found to reduce with increase in number of coating cycles. The PL spectra of Ti02fi1ms have two peaks at 485 nm and 530 nm and intensity increases with increase in coating cycles. Surface morphology from FESEM images reveal that the films are becoming denser and roughness increases with increase in the number of coating cycles. These results suggest that the nanocrystalline Ti02 thin films are attractive material for photo catalytic applications.