Synthesis and Characterization of (TiO2)1-x(WO3)x Composites

Abstract

We report about multilayer (TiO₂)_1-x(WO₃)_x thin films with various tungsten oxide concentration deposited on glass substrate via  pulsed laser deposition (PLD) technique method. The structural, optical and dielectric properties of the prepared thin films were characterized using x-ray diffraction method (XRD) and UV-Visible absorption spectrometry and LRC meter. The x-ray results showed a polycrystalline structure of pristine titanium oxide and the peaks are identical with the rutile phase and trace of the anatase phase. These peaks are identical with titanium oxide and triclinic tungsten oxide as WO₃ is added to TiO₂ while it was observed that all peaks belong to tungsten oxide at x=1.0. The optical measurements showed a direct E_g^opt energy gap of 3.0 eV of the pristine titanium oxide, which showed a non-regular reduction to 1.2 eV with an increase in the content from x = 0.0 to x = 0.6. The “s’’ value and the density of states at the Fermi level were found to be increased by increasing the tungsten oxide content up to x=0.8 and then changed and vice versa.