Preparation and characterization of nanocrystalline ZnO particles from a hydrothermal process |
| |
Authors: | Yi Hu Hung-Jiun Chen |
| |
Institution: | (1) Department of Materials Engineering, Tatung University, 40 Chungshan North Road, 3 sec., Taipei, 104, Taiwan, ROC |
| |
Abstract: | Rod-like ZnO nanoparticles were prepared by the hydrolysis of zinc acetate under heating in diethylene glycol (DEG). Structural
characterization of the synthesized powders was investigated by XRD, FT-IR, electron paramagnetic resonance (EPR) and transmission
electron microscopy (TEM). The size of the particles increased as the amount of H2O added increased in the nano size range. The average crystallite size calculated from the XRD patterns varied from 6 to 64 nm
corresponding to the amount of H2O added. The ZnO nanopartilces possess the wurtzite type crystallographic structure. It was found that these ZnO nanoparticles
had singly ionized oxygen vacancy defect () and superoxide ions from the EPR investigations. A strong near UV emission of the ZnO nanoparticles at about 380 nm was observed
and its intensity decreased as the amount of H2O increased. This emission of ZnO nanoparticles is found to be particles size dependent due to the confinement effect. A green
emission at about 540 nm due to the recombination of electrons trapped at singly ionized oxygen vacancies defect () appeared when the amount of H2O increased. The intensity of the green emission increases as the concentration of increases. |
| |
Keywords: | ZnO nanoparticles Hydrothermal Photoluminescence Defects Rod-like shape |
本文献已被 SpringerLink 等数据库收录! |
|