Structural and Optical Properties of ZnO Nanostructures with Various Distance Condition by Vapor Phase Transport

Abstract

ZnO structures were grown on Au-catalyzed Si substrate with various distances between the source and substrate ranging from 5 to 50 mm by the vapor phase transport at the growth temperature of 900 degrees celcius in argon/oxygen ambient. The structural and optical properties of the ZnO structures were investigated by field-emission scanning electron microscopy, X-ray diffraction and photoluminescence. The ZnO structures exhibited different morphologies, such as nanowires and submicron particles. Particularly, when the distance from the source was 5 mm, it was observed the ZnO nanowires with diameters in the range of 70 to 250 nm and the narrowest full width at half maximum of X-ray diffraction and photoluminescence spectra with 0.061 degrees and 96 meV, respectively. Therefore, the ZnO nanowires had a high crystallinity and optical properties compared to the ZnO submicron particles.