High crystalline tungsten trioxide thin layer obtained by SPD technique

A nanostructured layer of tungsten oxide, WO3, was prepared by a spray pyrolysis deposition (SPD) method using (NH4)2WO4 precursor. The films were investigated in order to determine the electrical behaviour (impedance, Mott–Schottky and I–V) and the morphological characteristics (SEM). The XRD analysis reveals that tungsten oxide is present in monoclinic phase but the orthorhombic phase is also expected to be present in the structure of WO3 crystals. Changes in conductivity of the WO3 films have been observed after immersion in water.