Effect of Annealing Temperature on Structural and Optical properties of Fe Doped TiO2 Thin Films Prepared by Modified Sol-Gel Method

TiO2 anatase doped with 0.01wt% Fe were prepared by modified sol-gel method. Thin films were coated on the clean microscopic glass slide by doctor-blade method. The prepared films were annealed at different temperatures at 300 and 350 degrees C. The structural characterization was studied by X-ray diffraction (XRD). The morphology of the films are studied using Scanning Electron microscope. The optical properties were studied by a dual beam photo spectrometer in the wavelength range 300-850nm. The crystallite size is estimated to be in the range of 30-50 nm with annealing temperatures. The optical band gap is observed to be reduced significantly at 350 degrees C. The variation of the optical parameters like refractive index and extinction coefficient are studied.