Abstract
The Fe2O3-TiO2 mixed nanostructure was grown from Fe/Ti metallic source using evaporation-condensation method. The formation of mixed Fe2O3-TiO2 nanostructures was confirmed by energy dispersive analysis of X-ray and X-ray diffraction analysis. The scanning electron microscopy showed that the samples consisted of large amounts of two kinds dispersed particulates. The small particulates had sizes in the range of 130-170 nm and the big particulates had sizes in the range of 300-800 nm. Optical properties including refractive index (n), extinction coefficient (k), energy band gap (E-g), and Urbach energy (E-u) of the mixed thin film were investigated by spectroscopic ellipsometer. The Fe2O3-TiO2 nanostructure had low n values compared to the previously reported values for Fe2O3 and TiO2, while the value of band gap (2.54 +/- A 0.02 eV) lied in between the band gap values of Fe2O3 and TiO2. The mixed Fe2O3-TiO2 nanostructures showed enhanced photocatalytic activities.