Synthesis And Characterization Of ZnO Nanoparticles By Sol-Gel Method

Nanometer ZnO is a kind of the new pattern high-function abio-product in the 21st century. Compared with common ZnO, nanometer ZnO has more special capability such as piezoelectricity, fluorescence, no-transplant, absorb and scatter ultraviolet radiation and so on. So nanometer ZnO can be used as piezoelectricity resistance, piezoelectricity material, gas sensor, recording image material, catalyzer etc. There are several ways to prepare nanometer ZnO, the Sol-Gel method attracted many people because it tend to do modification and the reaction process can be easily controlled. The Sol-Gel also has advantages like low reaction temperature,high product uniformity and purity and so on.In this paper, ZnO nanoparticles modified by PEG-400 and (NH4)3C6H5O7 have been synthesized successfully from Zn(Ac)2?2H2O by Sol-Gel method. Effects of reactant concentration, amount of solvent and modifier, reaction temperature, kinds or peptizator, desiccation temperature and time, calcination temperature and time on the final product ZnO were also investigated. It had been indicated that: (1) When modified by PEG-400, the perfect prepare conditions were: the concentration of Zn(Ac)2?2H2O was 0.5 to 1 mol/L, the amount of C2H5OH was 1 to 3 times that H2O in volume, the amount of modifier was 130 to 200ml PEG-400 per mol Zn+; (2) When modified by (NH4)3C6H5O7, the concentration of Zn(Ac)2?2H2O was 0.5 to1.8 mol/L, the amount of C2H5OH was 1 to 2.5 times that H2O in volume, the ratio of mZ n(Ac2) ? 2H2O/m(NH4)3C6H5O7was 1.1 to 3.3. After desiccated at 80℃for 2h, and calcined at 600℃for 2h, ZnO nanoparticle was got.The precursor and Zn(OH)2 gel were analyzed by TGA (Thermo Gravimetric Analysis) method, the final product was proved to be ZnO, and the purity both of the two different ZnO nanoparticles were above 99%. The dispersed stability in ethanol and water of the ZnO nanoparticles were also tested, it turned out that the ZnO nanoparticles modified by PEG -400 had good dispersed stability in ethanol, and that modified by (NH4)3C6H5O7 had good dispersed stability in water. Mixed with ethanol, we tested the ultraviolet radiation absorb capability of the two kinds ZnO nanoparticles, it was found that both of them can absorb the UVB and UVC mostly, and the ZnO nanoparticles modified by PEG-400 can absorb UVA more effectively than that modified by (NH4)3C6H5O7.The shape and size of ZnO nanoparticles were observed by using Atomic Force...