Raman study of surface optical phonons in ZnO(Co) nanoparticles prepared by hydrothermal method

Abstract

Raman scattering spectra of nanocrystalline samples of ZnO(Co) prepared by microwave-assisted hydrothermal synthesis were obtained and surface optical phonons (SOP) where observed in the range of 519-572 cm-1. The mean crystalline size (33-300 nm) as well as the phase composition of obtained samples (ZnO and ZnCo2O4) were determined by X-ray diffraction measurements. These measurements allowed us to study the change of SOP modes position with crystalline size and how the change in concentration of doping component CoO affects the change of SOP modes intensity.