掺杂纳米TiO2粉体的制备及其光电性能研究

Study on Preparation and Optoelectronic Properties of Doped TiO2 Nano-sized Powder

利用Zn2＋离子掺杂纳米二氧化钛，以提高其光电转化性能，通过溶胶一凝胶法制备了Zn2＋离子掺杂的纳米二氧化钛粉体，采用X射线衍射、扫描电镜、紫外可见光谱和光诱导产生光电流法对掺杂二氧化钛的物相、形貌、光吸收性能和光电性能进行了表征。研究发现，Zn2＋掺杂有利于锐钛矿的结晶，掺杂二氧化钛较纯二氧化钛的紫外吸收边红移了约10nm，当Zn2＋掺杂量为Ti物质的量的1％时光电转化性能最佳。

In oder to endence the photoelectronic performance of TiO2, Zn2＋ doped TiO2 nano-sized powder was synthesized by sol-gel method. The characterizations of the synthesized samples were performed by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, ultraviolet visi- ble spectroscopy（UV-vis）and UV-light induced photoelectric-current. The results showed that the samples calcined at 400℃ were all anatase and the doping was propitious to crystallizing of TiO2 by XRD and SEM. The TiO2 samples exhibited enhanced absorption at the ultraviolet range and the ab- sorption-edge of doped samples red shitted 10 nm in the UV-vis spectra doping were found to significantly enhance the photoelectronic perfor- mance of TiO2 and the best doping rate was n（Ti4＋） ： n（Zn2＋）=100 ： 1.