Thermal Evaporation Method Zno One-dimensional Nanomaterials And Characterization

Due to its unique and novel optical, photoelectricity, catalysis, piezoelectricity properties of the semiconductor oxide, many attentions have been paid to their synthesis and applications. Since the discovery of semiconductor nanobelts in 2001 by Professor Zhonglin Wang, one-dimensional semiconductor oxide nanomaterials received intensive interests. ZnO as a typical Ⅱ - Ⅵ semiconductor material, espiceally its nano structures which possessed of many peculiar properties, have received wide interests for potential applications.In this paper, 1D ZnO nanostructures synthesized by various methods have been summarized. Then we have successfully fabricated many kind of one-dimensional ZnO nanostructures by thermal evaporation method. The growth mechanism of the nanostructures has been proposed. And the optical properties of the nanostructures have been investigated. The main results achieved in this paper are given as below:(1) The ZnO nanowires, comb-like ZnO nanowires, dendrite ZnO nanowires, local aligned ZnO nanowires and other particular ZnO structures have been synthesized by using the as-synthesized ZnO nanostructures and C as source materials at 1100℃.(2) Two different types of aligned ZnO nanowires have been successfully synthesized at similar conditions by using the Si substrate covered by a layer of ZnO film deposited by radio-frequency magnetron sputtering method. Thereby substrate is proved to be very importmant for the synthesizing of aligned ZnO nanostructures. We found that the release rate of Zn ions plays a crucial role on the diameter of the as-synthesized nanowires through the study on the influence of gas flux, temperature and source materials.(3) The comb-like, needle-like and belt-like ZnO nanostructures have been synthesized by using Zn powder as source material at low temperature of 500℃. Altering the reactant temperature, we may get different structures, and the size of ZnO structures become small as the reactant temperature decreases. So it also proved that the release rate of Zn ions plays a crucial role on the size of as-synthesized ZnO nanostructures. Zn/ZnO compound nanostructures and ZnO nanotubes have also been obtained.