The Influences Of Haloid On The Morphology Of ZnO,PbO Prepared By Solid State Reaction

Solid state reaction at room temperature is the reaction of solid with solid at roomtemperature or near room temperature, also called the low heating solid state reaction. Thismethod is simple and easy to operate, and the ratio of production is high, and does not requirethe solvent, and consequently introducing a series of advantages such as being pollution-freeor low pollution of solvent, and energy-saving as well.Based on nanometer ZnO and PbO have been prepared by one-step solid state reaction atroom temperature via sodium hydroxide with zinc salt and lead salt, the influences of chlorideion on the morphology of ZnO and PbO have been studied. Influences of chloride ion on thegrowth mechanism of ZnO nanorods and PbO nanorods was discussed. The productions havebeen characterized by X-ray diffractomer(XRD) and transmission electron microscope(TEM).The properties of ZnO nanostuctured materials have also been studied.The haloid have important effects on the morphologies of ZnO and PbO nanosructures. Using zincsulfate with sodium hydroxide have obtained the spherical ZnO of diameters 20~30nm, If addsodium chloride to the zinc sulfate, the spherical ZnO turn into the ZnO nanorods of diameter10nm and lenghts 150nm. Using lead acetate with sodium hydroxide have obtained thespherical PbO of diameters 10~20nm, If add sodium chloride to the lead acetate, the sphericalPbO turn into the PbO nanorods of diameter 70~100nm and lenghts 3200nm.UV-vis absorption spectra of the as-synthesized ZnO nanorods and spherical weremeasured. There are strong UV absorptions at ~362 nm for all the samples, which is wellconsistent to the theoretic value (370 nm). Room-temperature photoluminescence propertiesof the as-synthesized ZnO nanorods and spherical were also measured. A UV emission andblue-green emissions were observed in the PL spectra when the samples were excitated by aXe lamp using an excitation wavelength of 325 nm at room temperature. The UV emissioncorresponds to the near band edge emission of the wide band gap of ZnO due to theannihilation of excitons, and blue-green emissions result from the recombination ofphotogenerated hole with the singly ionized oxygen vacancy in ZnO. So the ZnOnanoparticles are promising as high-performance optical materials due to their excellent UVemission properties.