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采用溶胶-凝胶法制备了不同掺杂Sn的TiO2纳米粒子,并主要利用表面光电压谱(SPS)和电场诱导表面光电压谱(EFISPS)对样品进行了表征,重点探讨了焙烧温度和掺Sn量对TiO2光生电荷性质的影响.同时揭示了样品结构与表面光生束缚激子的关系及其特性.结果表明:与束缚激子相关的光伏响应只在含有金红石相的TiO2样品中出现,且在混晶相中表现得更加显著.掺杂适量Sn不仅提高了纳米TiO2的与带带跃迁相关的SPS响应强度,同时也使与束缚激子相关的SPS响应明显增强.
Different doped Sn nanoparticles were prepared by sol-gel method. The samples were characterized by surface photovoltage spectroscopy (SPS) and electric field induced surface photovoltage spectroscopy (EFISPS). The effects of calcination temperature and Sn content On the charge-generating properties of TiO2. The relationship between the structure of the sample and the surface photo-generated bound exciton and its properties were also revealed. The results show that the photovoltaic response associated with the bound exciton appears only in the TiO2 sample containing rutile phase, And the crystal phase is more significant.Doping Sn with appropriate amount not only improves the SPS response strength of the nanosized TiO2 which is related to the band transition but also significantly increases the SPS response associated with the bound exciton.