掺Ti对ZnO纳米颗粒的微观结构与光学特性的影响

摘要

The Tix Zn1-x O nano-particles 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 crys-tallization 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 va-cancy defects reduced and then the near band emission ( NBE) peak is blue shift, but the growth of NBE peak intensity is little. The Raman spectrum indicates that the crystalline quality of Tix Zn1-x O 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 high-erTC(002) value, the weaker the multi-phonon modal signals, and the larger the growth of NBE peak intensity.%本研究利用溶胶凝胶法制备了Tix Zn1-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Tix Zn1-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.