自组织TiO2纳米管阵列的制备及形成机理

来源期刊:中国有色金属学报2010年第9期

论文作者:陈秀琴 张兴旺 雷乐成

文章页码:1724 - 1731

关键词:TiO2纳米管阵列;阳极氧化;形成机理;可见光

Key words:TiO2 nanotube array; anodic oxidation; formation mechanism; visible light

摘    要:采用电化学阳极氧化法,在纯Ti表面一步制得原位生长的自组织TiO2纳米管阵列。采用扫描电镜(SEM)、X射线光电子能谱(XPS)、紫外-可见光漫反射吸收光谱(UV-vis DRS)对煅烧后样品进行表征,并探讨纳米管阵列的形成机理。结果表明,在优化的制备参数条件下,所得TiO2纳米管排列整齐,平均管径约为150 nm, 平均管长约为400 nm,且对400~700 nm可见光有较大吸收。XPS分析发现,0.35%(摩尔分数)的F原子掺杂进入TiO2晶格中。可见光催化降解染料AO7的结果表明,673 K煅烧的F-TiO2纳米管对AO7的去除率达到37.2%。

Abstract: Self-organized TiO2 nanotube arrays were fabricated by a one-step electrochemical anodization process on a Ti sheet. The prepared samples were annealed in air and detected by SEM, XPS and UV-vis DRS spectrophotometry. And the possible formation mechanism was presented. The results show that the well ordered TiO2 nanotube arrays with the average tube diameter of 150 nm and the average tube length of 400 nm were fabricated under optimized electrolyte and oxidation conditions. The TiO2 nanotubes exhibit strong absorption in visible-light region of 400-700 nm. The fluorine with an molar fraction of 0.35% is doped into TiO2 nanotubes, as evidenced by XPS. The removal efficiency of AO7 by the F-TiO2 nanotube arrays annealed at 673 K reaches 37.2 % under visible light irradiation.

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