中文摘要：

以ZnO纳米柱阵列为模板,采用溶胶-凝胶法制备出TiO2/ZnO和N掺杂TiO2/ZnO的复合纳米管阵列.扫描电镜（SEM）、X射线光电子能谱（XPS）和紫外-可见漫反射吸收光谱（UV-Vis）的结果表明：两种阵列的纳米管均为六角形结构,直径约为100nm,壁厚约为20nm;在N-TiO2/ZnO复合纳米管阵列中,掺入的N离子主要是以N-Ox、N-C和N-N的形式化学吸附在纳米管表面,仅有少量的N离子以取代式掺杂的方式占据TiO2晶格O的位置;表面N物种形成的表面态能级和取代式掺杂导致带隙的窄化,增强了纳米管阵列的光吸收效率,促进了光生载流子的分离.光催化实验结果表明,N离子的掺杂有利于N-TiO2/ZnO复合纳米管阵列光催化活性的提高.

英文摘要：

TiO2/ZnO and N-doped TiO2/ZnO composite nanotube arrays were synthesized by the sol-gel method using ZnO nanorod arrays as a template.Scanning electron microscopy （SEM）,X-ray photoelectron spectroscopy （XPS）,and diffuse reflectance UV-Vis spectroscopy （UV-Vis） were used to characterize the samples.The nanotubes had a uniform hexagonal shape.The diameter and wall thickness of the nanotubes were about 100 nm and 20 nm,respectively.Some N dopants were substitutionally doped into the TiO2 lattice,while the N-Ox,N-C,and N-N were chemically absorbed onto the surface of the TiO2/ZnO composite nanotubes.Dopant-induced narrowing of the bandgap resulted from the doping of N ions into the TiO2 lattices.The surface N species enhanced the visible-light response and promoted the separation of photogenerated carriers.Compared with the TiO2/ZnO composite nanotube arrays,the NTiO2/ZnO composite nanotube arrays exhibited higher photocatalytic activity.