Preparation And Optical Properties Study Of ZnO And ZnO-based Nanomaterials

As an important wide band gap semiconductor nanomaterials, Nano ZnO shows its excellent physical and chemical properties, what make it to be favored by the majority of researchers. ZnO-doped and ZnO-based nanostructures have shown great potential applications in so many fields, and given a very broad prospects for development. A variety of morphologies ZnO nanostructures were prepared by thermal evaporation in this paper, and the effects on the quality of steam source and reaction temperature were compared. ZnO nanorods arrays were successfully fabricated by electrochemical deposition method, and a series of Al3+ doping experiments were carried out. The ZnO-Cd S composite nanomaterials were synthesized successfully by using the basal of prepared nanorods arrays. The prepared samples were characterized by XRD, EDS and FESEM, and tested by Raman spectra, PL spectra and UV-vis spectra, to analyz the morphology and optical properties of the samples.What research contents we have done and what we can conclud from this paper are as follows:1、ZnO nano structures were successfully prepared by controlling the quality of the reactive source and reaction temperature of the rang 1050℃ to 1200℃ by using the method of low vacuum thermal evaporation. The size of ZnO nanostructures becomes larger with the increasing of temperature. And we find the growth of ZnO nanostructures is not complete while the source is not enough.It is found that the higher temperatures would increase the crystallinity of ZnO nanostructures through the analysis of Raman Spectra, PL Spectra.degree of crystallization will be worse if the evaporation sources is not enough.2、ZnO nanorod arrays were prepared on ITO conductive glass through the low temperature constant current electrochemical deposition method.A series of Al-doped ZnO nanostructures were successfully prepared by controlling the concentration of Al3+ with the ZnO nanorod arrays as the substrate. With the Al3+ concentration increasing, the ZnO nanorod arrays finally became sparse and disorder,and finally changed into ZnO nanoflower. When the doping concentration is low, little effect could effect the crystal structure of ZnO. And the higher the concentration we doped, the more the impact came out.With the higher Al3+ doping concentration, the defects level of ZnO turned higher.3、ZnO nanorod arrays were prepared by the low temperature constant current electrochemical deposition method on ITO conductive glass. A layer of Cd S film was deposited by a low temperature constant voltage electrodeposition on ZnO nanorod arrays, and formed the ZnO-Cd S heterojunction.