Cu掺杂二氧化钛纳米管阵列的研究

Research on Cu-doped TiO_2 Nanotube Arrays

采用阳极氧化法在Ti表面构建出TiO2纳米管阵列,然后将材料完全浸没在硝酸铜溶液中制备出Cu掺杂TiO2纳米管阵列。利用场发射扫描电子显微镜(FE-SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和紫外可见漫反射吸收光谱(DRS)技术对材料结构特征进行表征,结果表明,钛表面均匀分布TiO2纳米管状阵列,管径50～90nm,管长约250nm;Cu元素在TiO2纳米管中部分取代TiO2晶格中的Ti元素以Cu2+形式存在,形成Cu-O;同时,Cu的掺杂使TiO2纳米管阵列的激发波长扩展到可见光的范围内,有助于提高TiO2纳米管阵列对可见光的利用效率。

TiO2 nanotube arrays were fabricated by anodic oxidation on the pure titanium, subsequently, the samples were fully dipped into copper nitrate solution in order to obtain Cu-doped TiO2 nanotube arrays. The Cu-doped TiO2 nanotube arrays were characterized using a field-emission scanning electron microscopy （ FE-SEM）, X-ray photoelectron spectroscopy （ XPS ）, X-ray diffractometer （ XRD ） and UV- vis diffuse reflectance absorption spectra（DRS） techniques. The research showed that the Cu-doped TiO2 nanotube arrays with 50-90 nm in diameter and approximate 250 nm in length were distributed uniformly on Ti substrate ; Cu element in the TiO2 nanotube was substituted for Ti element in TiO2 crystal lattice and formed Cu-O; photoabsorption of Cu-doped TiO2 nanotube array was enhanced in the visible-light region, it is helpful to improve the efficiency of absorbing visible-light.