中文摘要：

常压下,采用强碱熔融-水热法,制备了Ag修饰复合TiO2纳米管,并就材料的组织与形貌进行了表征。XRD表征显示复合TiO2纳米管由锐钛矿和金红石相组成。TiO2纳米管形貌清晰,较均匀整齐,管径约为3～5nm,由3～5层单壁组成,管壁壁厚约为0.5nm,其中,Ti和Ag纳米颗粒清晰地附着在纳米管之间以及最外层纳米管壁上。在350nm波长以内,均出现带-带跃迁。表面光电压谱（surface photovoltagespectroscopy,SPS）和场致诱导表面光电压谱（electricfield-induced surface photovoltage spectroscopy,FISPS）光伏响应强度随着外电场极性的改变作不对称变化,出现束缚激子亚带隙跃迁的特征。Ag修饰对TiO2纳米管光伏响应影响大。

英文摘要：

Ag-modified,composite TiO2 nanotubes were synthesized using molten alkali-hydrothermal method under an ambient atmospheric pressure.The organization and morphology of the composite TiO2 nanotubes were characterized.Nanotubes have clear,uniform and neat morphology with diameter of around 3 to 5nm,each nanotube composed of 3 to 5 layers and wall thickness of around 0.5nm.In particular,TiO2 and Ag nanoparticles clearly adhere in between nanotubes and at the exterior surface of nanotubes.XRD results display that,the composite TiO2 nanotubes from the single anatase phase to the anatase and rutile mixed phase.The band-band transition occurs within a wavelength span of 350nm.SPS（surface photovoltage spectroscopy）and FISPS（electric field-induced surface photovoltage spectroscopy） demonstrate the bound exciton sub-band-gap transition characteristics from its asymmetric changes corresponding to changes in polarity of the external electric field.Ag modifing has imposed considerable influence on both the photovoltaic response of composite TiO2 nanotubes and the separation of photoinduced electrons and holes at the surface of nanotubes.