Novel nanobar Pt/ZnO thin films produced by spin — Coating and the effect of annealing on structural and optical properties

Novel nanobar Pt/ZnO thin films were prepared by the sol-gel technique associated with spin coating onto glass substrates. The as-prepared samples were annealed and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and UV-vis absorption spectroscopy (UV-vis). The results indicate that the Pt/ZnO thin films consist of nanobars with diameters about 58 nm. By increasing the annealing temperature from 723 K to 823 K, nanobar is converted to polycrystalline with a hexagonal wurtzite structure with diameters about 75 nm.