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采用溶胶-凝胶法制备了纯的和掺Li+的TiO2纳米粒子,利用XRD、XPS、UV-Vis和表面光电压谱(SPS)测试技术对样品结构进行了表征.分析了不同退火温度及不同Li+掺杂量对TiO2纳米粒子表面光电性能的影响,讨论了Li+掺杂对TiO2纳米粒子表面光电性能影响的机制.实验结果表明:Li+掺杂TiO2在退火温度600℃时已完全转化为金红石相,相对于纯TiO2而言,Li+掺杂降低了相转化温度;退火温度为500℃,Li+掺杂量为1%的TiO2纳米粒子的表面光电压显著增强,这可能与Li+掺杂所引起的光吸收能力的提高以及缺陷有关.
The pure and Li + -doped TiO2 nanoparticles were prepared by sol-gel method and their structures were characterized by XRD, XPS, UV-Vis and surface photovoltage spectroscopy (SPS). The effects of different annealing temperature and different Li + Doping amount on the surface of the electro-optical properties of TiO2nanoparticles, the mechanism of Li + doping on the surface electro-optical properties of TiO2nanoparticles was discussed.The experimental results show that Li + doped TiO2 has completely transformed into rutile phase at 600 ℃, Compared with pure TiO2, Li + doping reduced the phase transition temperature; the surface photovoltage of TiO2 nanoparticles with the annealing temperature of 500 ℃ and Li + doping amount of 1% increased significantly, which may be related to the light absorption caused by Li + doping Ability to improve and defects related.