Tio2纳米管的模板法制备及表征

TiO2纳米材料在太阳能的储存与利用、光电转换、光致变色及光催化降解大气和水中的污染物等方面具有广阔的应用前景，成为重点研究的课题之一1～5].目前，以TiO2纳米粉体和纳米膜的研究较为普遍，而TiO2纳米管的报道不多.由于纳米管比纳米膜具有更大的比表面积，因而具有较高的吸附能力，可望提高TiO2的光电转换效率.模板法(包括多孔阳极氧化铝膜(PAA)、光刻蚀制备的纳米模板、聚碳酸酯纳米滤膜等)在制备导电聚合物、金属、碳、无机半导体等纳米管或线型材料方面已得到广泛应用6～9]，在这些模板中，PAA膜具有均匀分布的垂直于表面的相互平行的密集纳米孔，且孔径、孔间距、膜厚可以通过电化学手段加以控制10～13].

Template Synthesis and Characterization of TiO2 Nanotubules

The template method for preparing nanostructures entails the synthesis of the desired material within the pores of a nanoporous membrane.In this work,TiO2 nanotubules of the anatase form have been synthesized by sol-gel chemical method using porous anodic alumina as the template.Transmission electron microscopy (TEM),scanning electron microscopy (SEM),infrared spectroscopy (IR) and X-ray diffraction were used to investigate the structure and morphology of the TiO2 nanotubules.The results showed that the diameter and length of the obtained nanotubules were determined by the pore size and length of the PAA template.It was founded that through control of immersion time,both tubules and fibrils can be prepared; in addition,the wall thickness of the nanotubules can be varied at will.The result indicated that the sol particles absorbed preferably to the pore walls of the PAA membrane due to the fact that the pore walls were negatively charged and the TiO2 particles were positively charged.