Structural, Morphological and Optical Properties of Co3O4 Thin Film


The sol-gel technique was used because it is simple, economic and less equipment. The films deposited by dip coating method on glass substrate. The effect of pH value and annealing temperatures on structural, morphological and optical properties of Co3O4 were studied by XRay diffraction (XRD), Scanning Electron Microscope (SEM) and UV-visible Spectroscopy(UV-VIS). XRD measurements show that all the films are nanocrystallized in the cubic spinel structure and the films quality improved with increase the pH value and annealing temperatures. SEM images shows that the films was discontinuous surface with spherically grains increase from (65 to 83 nm) with increase the pH from 10.5 to 11.5. the annealing temperature improved the surface morphology. The optical band gap Eg was decrease from 2.7to 2.4 eV when the pH alter from 9.5 to 11.5 while decrease from 2.5 to 2 eV with increase the annealing temperature from 300 to 600 °C .