Preparation and characterization of CdO-ZnO core shell nano particles: Prepared by two step wet chemical method

Abstract

CdO–ZnO core-shell nanoparticles (CSN) were successfully synthesized by two step assisted chemical sol gel method. The structural properties of synthesized CSN have been analyze by X-ray diffraction (XRD) method, XRD pattern shows a uniform, homogenous phase formation of nano crystals. Microstructural properties of prepared CSN have been analyze by FESEM and HRTEM methods, Surface morphology of the CSN was investigated using FESEM, which shows dense growth and thin layer of ZnO shell over CdO core where as crystallinity of the CSN have been observed from HRTEM images, HRTEM reassures the particle size as obtained from XRD analysis. The optical properties and optical band gap of CSN is obtained from UV–Visible spectroscopy. Raman modes obtained from Raman spectroscopy distinctly identify the CdO and ZnO phonon vibrational modes. The electrical properties have been investigated by temperature dependent dielectric measurement. Moreover, the impedance behavior at different temperature has been investigated by impedance spectroscopy.