The Synthesis And Field-emission Characteristics Of ZnO Nanostructures

The differences and superiorities of zinc oxide nanomaterials in their properties comparing with their corresponding bulk counterparts have made the nanoscience and nanotechnology come into being, which are promoting the development of each other. As the integration of the nanomaterial and a kind of wide-band semiconductor, the wide-band semiconductor nanostructures have received great attention. For example, ZnO has become the research focus including its growth methods and applications. One of the potential applications of ZnO is to be used as the cold cathode of field emission display(FED). Because the morphologies and size of the materials which to some extent rely on the growth method of the materials may have great influences on the FE properties, the main results are listed as below:1) Different morphologies and size of ZnO nanostructures have been synthesized via controlling the relative content of oxygen and using different sources by thermal evaporation method, XRD and SEM were used to study the structures and morphologies of the products. It was shown that the relatively smaller oxygen content comparing with that of the nitrogen could be helpful. The different growth mechanisms of VLS and VS may have respectively taken part in the growing processes of the different morphologies of ZnO products. At last, the FE properties were revealed;2) ZnO nanostructures have been synthesized by hydrothermal method and the growth mechanism has been discussed. The results showed that PH value, the concentration, etc, of the solution, and other factors such as the reaction time had effects on the size and morphologies of the products. The FE properties revealed that among the three morphologies of the balls, the belts and the rods, the nanorods had the best FE properties with the turn-on and threshold voltages of respectively 3.01V/μm and 5.47V/μm;3) Using the gold thin films and Au colloids as the catalyst respectively, ZnO nanostructures have been fabricated through thermal evaporation method. The...