||Our laboratory had grown zinc oxide (ZnO) nano-materials successfully in many cases in the past. In this study, ZnO nano-materials were grown on (100) LiGaO2 (LGO) substrate by chemical vapor deposition. Argon and oxygen are used as the carrier gas and reaction gas, repectively. The mixture powders of ZnO and graphite are used as the reaction sources. ZnO nano-materials were grown by vapor-liquid-solid method. LGO substrates were coated with Au before experiment and use Au as catalyst. Growth mechanism of ZnO nano-materials is investigated by varied growth parameters.|
After the reaction of ZnO nano-materials grown, we used scanning electron microscope, x-ray diffractometer, transmission electron microscope, photoluminescence spectroscope, cathodoluminescence and Raman spectroscope to analyze the characteristics of ZnO nano-materials, such as crystal structure, surface morphology, growth mechanism and optical properties.
The experiment has three parts. First, the dependence of the catalyst of Au thickness was investigated. Second, different soure ratio of ZnO and graphite (ZnO:C) was discussed. The last, the different reaction temperature in different ratio of ZnO and graphite was examined.
There are two differenctt structures on the crystal structure and surface morphology of the Zinc oxide nano-materials can be observed, which are ZnO nano-belts structure with growth direction of [1-100]ZnO and [11-20]ZnO showed on the Sample A3 and the ZnO rods structure with branches showed on Sample D3. The analytic results of photoluminescence and cathodoluminescence showed near band edge of sample A3 and D3 are both stronger than deep-level emission. The results of Raman analysis demonstrated that sample A3 and D3 both had some compressive stress in the structure.