科研之友
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摘要
ZnO microrods with inverted cone shape and nail- like shape were formed by thermal evaporation of ZnS powder and ZnS/Zn mixture under air atmosphere. No catalysts and substrates were used. When ZnS powder was used as a source material, ZnO crystals had an inverted hexagonal cone shape, where the diameter of the microrods increased gradually from about 10 mu m at the bottom to 35 mu m at the top. When a mixture of ZnS and Zn powders was used as a source material, the diameters of the ZnO microrods increased significantly up to 40 similar to 80 mu m at the top, which makes the ZnO microrods a nail-like shape. X-ray diffraction patterns showed that all the ZnO microrods had a wurtzite crystallographic structure. Two emission peaks were observed in the cathodoluminescence spectra at room temperature. One was a peak at around 380 nm ( ultraviolet) and the other was a peak at 510 nm ( green). The high intensity ratio of ultraviolet emission to green emission was obtained for the nail-shaped ZnO microrods, indicating the high crystalline quality of the ZnO microrods.
- 出版日期2017
