Synthesis and Characterization of ZnO Nanoparticles using Effective of Co Doped

Abstract

The pure and Co doped ZnO nanoparticles were synthesized by chemical precipitation method at room temperature. The pure and Co doped ZnO nanoparticles have been characterized by X-ray powder diffraction (XRD), Scanning Electron Microscopy (SEM), ultraviolet visible and photoluminescence (PL) spectroscopy, Fourier transform infrared spectroscopy (FTIR). The XRD influence of on crystallite size. The effect of Zn doping with shifting of the bands were observed by UV-Vis spectroscopy and also their optical band gap were determined. The emission spectra and energy band diagram of the pure and Co doped samples were derived from PL spectroscopy. The structural bond vibrations of pure and Co doped ZnO nanoparticles were analyzed by FTIR spectroscopy. I. INTRODUCTION Zinc oxide having interesting physical and chemical properties, together with its cost-effective manufacturing process and abundance in nature, is a promising material for different applications, which has been intensively studied in past decades. The interest in ZnO is fueled and motivated by its excellent properties such as wide direct band gap (Eg ~3.36 eV at 300 K), high exciton binding energy (60 meV), good piezoelectric characteristics, chemical stability, and biocompatibility which make it a good candidate for diverse application including light-emitting diodes, laser diodes, solar cells, optoelectronic switches, surface acoustic wave devices, hydrogen-storage devices, transparent electrodes, transparent thin-film transistors and sensors [1-4]. These properties makes ZnO attractive in places where high hygiene it´s necessary [5]. Therefore, several methods were used to prepare ZnO nanoparticles such as: radio frequency (RF) sputtering process [6], CVD methods [7], pulsed laser deposition [8], spray pyrolisis [9], atomic layer deposition [10], chemical bath deposition [11] or electrodeposition [12]. In sol-gel technique, needs expensive precursors such as alkoxide or organometallic compounds. Forced hydrolysis and hydrothermal synthesis require higher temperatures, pressures and longer reaction time. Microemulsion technique is an important method to preparing large sized monodispersed ZnO nanocrystallites. Among all of these methods, the precipitation technique is an easy way to synthesis the nanoparticles, because of its simple procedure, cheap precursors and easy scalable. In the present work, pure and Co-doped ZnO nanoparticles were synthesized using precipitation method. The crystalline phase and structure of pure and Co doped ZnO nanoparticles are identified using XRD. The morphology and size of the samples were characterized using Scanning Electron Microscopy (SEM). The optical properties of the nanoparticles were analyzed using, UV-Visible, photoluminescence spectroscopy.