The Preparation Of Nanometer Zno And Zao And Performance Research

ZnO is a direct and wide band gap semiconductor of II-VI group,compared with common ZnO, nanometer ZnO have many special properties butmany macroscopic materials do not, and it is used for piezoelectricity resistance,piezoelectricity material, UV shielding material, gas sensor, radar absorbingmaterials, cosmetic,efficient catalysts and photo-catalyst, magnetic materialsetal.(1) In the paper, the pure nanometer ZnO powder were modified byZn(Ac)22H2O, PEG-400, C2H5OH and NH3H2O by Sol-Gel method. The XRDof nanomete ZnO average grain size is45nm around. With the heat treatmenttemperature is increaseing, the average diameter of ZnO decreases first andincreases. When the calcination temperature is550℃around, the minimum sizeof the ZnO is35.1nm.(2) In the paper, the nanometer ZnO and Al3+doped nanometer ZnOpowder were modified by Zn(NO3)2,CO(NH2)2,AlCl3,C2H5OH,C18H9NO3S andNH3H2O by the homogeneous precipitation method. Al3+doping does notchange nanometer ZnO crystal system structure. The XRD of nanometer ZnOaverage grain size is36.2nm around. With the heat treatment temperature isincreaseing, the average diameter of ZnO decreases first and increases.When thecalcination temperature is550℃around, the minimum size of the ZnO is35.1nm.(3) The research about dispersion and stability of nanometer ZnO had beenindicated that: The dispersion and stability of nanometer ZnO is better whichmodified of using C18H29NaO3S than using PEG-400as a modifier, thedispersion and stability of nanometer ZnO is better which Al3+doped than doesnot, and with the Al3+dope increasing, the dispersion and stability is better andbetter(doping from0to2%).With agglutination temperature increase from550to700℃, the dispersion and stability decreased.(4) When the length of waves is from250to390nm, the transmission is very low, it indicated that the solution has a good shielding properties in thewaves. When the length of wave is from400to700nm, it is in the scope ofvisible light. The transmission keeps90%around, it had been show that thesolution has a excellent light transmission. With Al3+concerntration increasing(doping from0to2%), the absorption edge of the nanometer ZnO change a blueshift to short waves. When Al3+concerntration reach to2%, the forbidden bandgap increases to the maximum, it had been show that when Al3+doped is2%,the carriers concentration are the highest.Both ultraviolet light absorbance andvisible light transmittance reach the maximum.