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以氧化锌(Zn O)和二氧化钛(Ti O2)为原料,采用固相反应法制备了掺杂不同Ti4+摩尔分数(x)的Zn O复合粉体。Zn O复合材料在经过温度为500℃,时间为3 h的煅烧之后,通过X射线衍射仪(XRD)、拉曼光谱仪、紫外-可见(UV-Vis)吸收光谱仪、红外光谱仪(IR)和扫描电镜(SEM)对复合材料的结构和光学性能进行了表征。研究结果表明,所有的Zn O复合材料都保持了Zn O的纤锌矿晶体结构,而过量Ti的掺杂则会降低Zn O的结晶度。另外,Zn O复合材料的光学性能因为Ti的掺杂有了很大的改变。复合材料在IR图中的Zn-O的特征吸收峰位置与纯Zn O相比出现了明显的蓝移,且吸收峰随着Ti掺杂浓度的增大而逐渐变宽。与此同时,复合材料的UV-Vis吸光度较纯Zn O显著下降,但禁带宽度随着Ti掺杂浓度的增大而明显增大。当Ti掺杂摩尔分数x=20.17%时,Ti O2能很好的融入到Zn O粉体中,且粉体晶粒较小,结晶质量高,界面颗粒接触比较紧密。
Zinc oxide (ZnO) and titanium dioxide (Ti O2) were used as raw materials to prepare Zn O composite powders doped with different Ti4 + molar fractions (x) by solid-state reaction. Zn O composites were characterized by X-ray diffractometry (XRD), Raman spectroscopy, UV-Vis absorption spectroscopy, infrared spectroscopy (IR) and scanning after being calcined at 500 ℃ for 3 h. The structure and optical properties of the composites were characterized by SEM. The results show that all the Zn O composites maintain the wurtzite crystal structure of Zn O, whereas the excessive Ti doping reduces the crystallinity of Zn O. In addition, the optical properties of Zn O composites have been greatly changed due to the doping of Ti. The characteristic absorption peaks of Zn-O in the IR image of the composites show a clear blue shift compared with the pure Zn O, and the absorption peak broadens with the increase of Ti doping concentration. At the same time, the UV-Vis absorbance of the composites decreased significantly compared with pure Zn O, but the band gap increased obviously with the increase of Ti doping concentration. When Ti doping mole fraction x = 20.17%, Ti O2 can be well incorporated into Zn O powder, and the powder grains are small, the crystal quality is high, and the interface particles are in close contact.