甘氨酸燃烧法合成纳米ZnO-MgO及其紫外光发射  

Preparation and Ultraviolet Emission of ZnO-MgO Nanocomposite by Glycine-Nitrate Combustion Process

作　　者：董伟伟[1] 杨碚芳[1] 傅正平[1] 王震[1] 杨应岭[1] 左健[2] 

机构地区：[1]中国科学技术大学材料科学与工程系,合肥230026 [2]中国科学院结构分析开放实验室,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2005年第3期395-400,共6页化学物理学报（英文）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChinaandtheYoungScientistsFoundationofUSTC.

摘　　要：利用甘氨酸燃烧法制备了ZnOMgO纳米复合材料,并在不同温度进行热处理.通过X射线衍射、扫描电子显微镜和傅里叶变换红外吸收谱,对其升温过程中的结构变化进行了表征,研究了热处理温度对样品室温光致发光行为的影响.结果表明,复合材料的发光性能与纯ZnO相比有很大改善,经900℃热处理的纳米复合材料,其发射谱由一个强紫外发射带(峰值385nm)构成;当热处理温度低于900℃时,发光强度随热处理温度的升高而增强,进一步将热处理温度升至1000℃时发光强度又明显降低.发光强度主要受ZnO、MgO纳米晶的粒子尺寸、结晶完善程度,尤其是受两相纳米粒子之间相互作用的影响.同时发现选择合适的甘氨酸与硝酸根离子的摩尔比,对改善样品紫外发光特性也很重要.ZnO-MgO nanocomposite was prepared by glycine-nitrate combustion method. Its photoluminescence property, the structure and annealing temperature dependence was studied by XRD, FTIR and SEM. The results show that the photoluminescence property of ZnO-MgO nanocomposite is greatly improved compared with that of pure ZnO. Under 325 nm laser excitation, the emission spectra of the 900 degrees C treated composite sample had an obviously enhanced ultraviolet (UV) band centered at 385 nm at room temperature. The luminescence intensity of the UV band became stronger with the increase of annealing temperatures and reached a maximum at 900 degrees C but decreased at 1000 degrees C. The photoluminescence intensity was mainly affected by the grain size, the crystallization and the action between ZnO and MgO nanoparticles. In addition, an appropriate G/N value was favorable for improving the UV-PL properties of the nanocomposite samples.

关 键 词：ZNO MGO 纳米复合 甘氨酸燃烧法 紫外光发射 

分 类 号：TB383[一般工业技术—材料科学与工程]