Synthesis And Characterization Of Zinc Oxide Micro-Nano Materials From Liquide Phase Method

Micro-nano scale ZnO mateirals，due to their unique properties, such as non-toxic andnon-transfer, fluorescence, piezoelectricity, absorption and scattering ultraviolet properties, showoutstanding performances in the optical，electrical, magnetic aspects，and have attracted people’sconcern and attention in recent years. As constantly studying, micro-nano scale ZnO materials areused as photocatalysts，image recording materials and wave absorbing materials in energy,chemical industry and pharmaceutical fields.In order to meet the different use in many ifelds，ZnO micro-nano materials must havedifferent properties. While the properties of ZnO micro-nano materials are greatly affected bytheir morphologies, the utilities of ZnO micro-nano materials base on their preparation. Althoughpeople have been able to prepare different morphologies through a variety of methods，it isdifficult to effectively control the growth of ZnO micro-nano structures. Therefore, theirpreparation is still important for ZnO research in the future.In this article，based on the review of ZnO and its material property, preparation andapplication，ZnO micro-nano spheres, nano rods and nano rod array were prepared by liquidphase method. The characterization instruments, including field emission scanning electronmicroscope, X-ray difrfaction，UV-visible spectrophotometer and fluorescence spectrometer,were used for the test and analysis of corresponding samples. Their growth mechanism are alsodiscussed. This paper was divided into three parts:ZnO micro-nano spheres, with regular morphology and uniform size were prepared by theultrasonic assisted deposition and hydrothermal method, respectively. Both samples have a strongUV-vis absorption peak at about364nm，suggesting that the ZnO micro-nano spheres preparedby the two methods have a higher utilization rate for solar light when used as photocatalyst. Their growth mechanism are also discussed.The six corners of wurtzite type nano ZnO mateials were prepared by hydrothermal methodadding Cd2+，including two kinds of morphology: nano rods and flower-like clusters composed ofnano rods. By changing reaction time and metal ion concentration, the length-diameter ratios ofZnO nano rods were controlled. With the increasing of metal ion concentration(l:0.02；1:0.04;1:0.06;1:0.08;1:0.1) and the prolonging reaction time(7h,9h，llh，13h，15h) in water bath,their length-diameter ratios decreased. As the length-diameter ratios became small，ZnO nanorods became short and thick. It is easily to form a cluster structure.Using spin coating-calcination method and successive ionic layer adsorption and reactionmethod, ZnO nano rod arrays were prepared. We also studied on the impact of different growthconditions on the crystallization and morphology of ZnO nano rod arrays. The prepared ZnOnano rod arrays have excellent crystallinity and show preferred orientation of c axis. But ZnOnano rod arrays, prepared by different methods and different conditions, have differentmorphologies. The method of successive ionic layer adsorption and reaction can provide moreadequate zinc source for ZnO nano rod，arrayss growth.