TiO2纳米管阵列具有比表面积大、吸附能力强和电子迁移率高等优点,在光催化降解有机污染物、染料敏化太阳能电池、光解水制氢、气敏元器件等领域具有广阔的应用前景,是当前人们的研究热点之一.对TiO2纳米管阵列的常见制备方法及其制备原理进行了综述,并分析了各种制备方法的优缺点.同时,TiO2由于是宽禁带半导体,其光吸收波长主要集中在紫外光区,光响应范围窄导致其对可见光的利用率较低.降低TiO2的禁带宽度、抑制光生载流子-空穴的复合,成为提高TiO2纳米管阵列的光催化效率及太阳能利用率的改性研究重点.着重阐述了国内外通过掺杂金属和非金属离子、沉积贵金属、复合半导体等方法来引入杂质或缺陷,使其光生载流子-空穴的复合减缓,或使其吸收光谱红移,从而达到提高光催化效果的相关研究进展,并指出了今后TiO2纳米管阵列在制备、改性和应用等方面的研究重点和方向.
Since TiO2 nanotube array feature in large specific surface area, strong adsorption capacity and high electron mo-bility, it has wide application prospect in fields including photocatalytic degradation of organic pollutants, dye sensitized solar cell, photolysis hydrogen production from water and gas sensitive components. It has become a research hotspot nowadays. Common preparation methods and preparation principles of TiO2 nanotube array were reviewed, advantages and disadvantages of these methods were also analyzed. Due to wide band gap, the light absorption wavelength of TiO2 was mainly in ultraviolet region, narrow photoresponse scope led to low utilization rate of visible light. Reducing the band gap of TiO2 and inhibiting re-combination of photo-generated electron-hole pairs have become the focus of modification research aiming to improve the pho-tocatalytic efficiency and utilization rate of solar energy of TiO2 nanotube arrays. Research progress on improving photocatalyt-ic efficiency of TiO2 nanotube arrays by slowing down the recombination of photo-generated electron–hole pairs or making the red-shift of absorption edge, which resulted from the introduction of impurities or defects by doping metal or non-metal ions, deposition of noble metals and semiconductor nanoparticle modification, was also emphasized. Moreover, the future research focus and areas of TiO2 nanotube arrays regarding preparation, modification and application were pointed out.
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