Comparative optical studies of ZnO and ZnO-TiO2 - Metal oxide nanoparticle

A comparative study was carried out to show the enhancement in optical activity of bimetal oxide nanoparticle (ZnO – TiO2) than metal oxide nanoparticle (ZnO), which can preferably be used for optical applications. The samples were prepared by wet chemical method and crystalline structure of the samples as hexagonal – primitive for ZnO and tetragonal – bcc for ZnO-TiO2 was confirmed by XRD measurements. The average grain size of ZnO – 19.89nm and ZnO–TiO2− 49.89 nm was calculated by Debye- Scherrer formula. The structure and particle size of the sample was analyzed by FESEM images. The direct band gap energy of ZnO (3.9eV) and ZnO – TiO2(4.68eV) was calculated by Kubelka-Munk Function, from which it is clear that the band gap energy increases in bimetal oxide to a desired level than in its pure form. The photoluminescence study shows that the emitted wavelength of the samples lies exactly around the visible region.