掺Ti对ZnO纳米颗粒的微观结构与光学特性的影响

本研究利用溶胶凝胶法制备了Ti_xZn_(1-x)O纳米粒子,并且分析了Ti掺杂对ZnO纳米粒子晶体结构与光学特性的影响.微观结构分析得知Ti掺杂会使ZnO结晶较差,晶格常数与压缩应力增大,但可使晶粒缩小至5 nm左右.光致发光(PL)光谱分析得出Ti掺杂会造成氧空位缺陷减少,近带边发光(NBE)峰值蓝移,但NBE峰值强度增幅变化却不大.拉曼光谱分析表明Ti_xZn_(1-x)O的结晶品质不佳且NBE峰值强度的增幅未完全依循多声子模态信号减弱而增强的规律,其原因是NBE峰值强度除受多声子模态信号影响外还受其它因素的影响.TC(002)值越高时样品的多声子模态信号会越弱,而NBE峰值强度增幅越大.

Effects of Ti doping on microstructure and optical property of ZnO nanoparticles

The TixZn1-xO nano-particle are prepared by sol-gel method and the effects of Ti doping on their lattice structure and optical property are studied in this paper. The analysis of microstructure shows that the crystallization of ZnO is poor, lattice constants become larger and compressive stress increases, due to Ti doping. However, the grain size decreases to be about 5 nm. The PL spectra reveal that Ti doping leads to the oxygen vacancy defects reduced and then the NBE peak is blue shift, but the growth of NBE peak intensity is little. The Raman spectrum indicates that the crystalline quality of TixZn1-xO is poor and the growth of NBE peak intensity is not enhanced with multi-phonon modal signals becoming weak. And the reason is the NBE peak intensity is influenced by multi-phonon modal signals and other factors. In addition, the TC(002) value be higher, the multi-phonon modal signals be weak, but the growth of NBE peak intensity be larger.