中文摘要：

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.

英文摘要：

Li＋ doped TiO2 nanoparticles were prepared by a sol-gel method, and also characterized by XRD, XPS, UV-Vis and surface photovoltage spectroscopy. Their properties such as crystal structure, crystallize sizes, optical and photoelectricity performance were investigated. The effects of annealed temperatures and Li＋ doping on the properties of surface photovoltage were mainly investigated. The modification mechanisms of the effects of Li＋ doped TiO2 on the properties of surface photovoltage were discussed. The results showed that Li＋ doped TiO2 nanoparticles annealed at 600 ℃ were completely become to rutile phase; by contrast to pure TiO2, Li＋ doping decreased the temperature of phase transformation; when 1% Li＋ doped TiO2 nanoparticles annealed at 500 ℃, the surface photovoltage was remarkably increased, which may be attributed to the enhanced capability of light absorption and defects by Li＋ doping.