规整TiO2纳米管阵列制备及其沉积改性研究进展

Research progress in preparation and deposition modification of ordered titanium dioxide nanotube array

TiO_2纳米管具有结构规整、比表面积大、催化活性高等优点,近年来受到越来越广泛的关注。然而受TiO_2纳米材料本身禁带宽度的限制,其仅在紫外光范围内有较高的催化效果,对太阳光谱的整体利用率很低。如何提高TiO_2纳米材料的光生电子利用率以及拓展其对可见光的吸收范围是目前研究领域内的热点,而采用元素掺杂可有效改善TiO_2纳米材料的能级结构。综述了金属元素、非金属、金属氧化物及半导体掺杂改性TiO_2纳米管的研究进展,为设计制备新一代TiO_2基高效催化剂以及加快TiO_2纳米材料的工业化应用进程提供依据。

In recent years TiO_2 nanotube have received more and more attention because of its regular structure,large surface area and high catalytic activity.However,TiO_2 materials can only be excited by UV light,so render the use of solar irradiation inefficient because of its wide band gap.Many researches have been reported on how to expand its absorption range of visible light and improve the utilization efficiency of photo-excited charge carriers.Doping is an efficient way to improve the band structure of TiO_2 nanomaterials.The research progress on TiO_2 nanotubes doped by metal elements,nonmetal elements and metal oxide semiconductors was overviewed to provide the basis for the design of a new generation of TiO_2 based catalyst with high efficiency and to accelerate the industrialization of TiO_2 nanomaterials.