Hierarchically Branched Titania Nanotubes with Tailored Diameters and Branch Numbers
Hierarchically Branched Titania Nanotubes with Tailored Diameters and Branch Numbers
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DOI：
10.1021/la204154h
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发表时间：
2012-02-07
期刊：
影响因子：
3.9
通讯作者：
Lu, Kathy
中科院分区：
文献类型：
--
作者：
Chen, Bo;Lu, Kathy
在过去的十年中，自组织TiO2纳米管的电化学阳极氧化得到了广泛的研究，主要集中在沿TiO2纳米管深度方向的均匀直径上。在本研究中，通过调整阳极氧化电压，成功地获得了具有定制直径和分支数的分层分支TiO2纳米管。当外加电压降低1/根号n时，一个主干纳米管会发散成n个分支的TiO2纳米管，其直径为主干纳米管直径的1/根号n （n为整数）。当外加电压以1/根号n的倍数进一步降低时，将支链纳米管进一步分割，可以得到多层支链TiO2纳米管。当阳极氧化电压增加根n倍时，TiO2纳米管发生放大和终止。施加电压的交替增加和减少导致TiO2纳米管的层次结构更加复杂。讨论了对这些过程的基本理解。
Over the past decade, electrochemical anodization of self-organized TiO2 nanotubes has been studied intensively with the main focus being on uniform diameters along the TiO2 nanotube depth direction. In the present work, hierarchically branched TiO2 nanotubes with tailored diameters and branch numbers are successfully achieved by adjusting the anodization voltage. Reducing the applied voltage by a factor of 1/root n causes a one trunk nanotube to diverge into n-branched TiO2 nanotubes, whose diameters are 1/root n of the trunk nanotube diameter (n is an integer). Multiple layers of branched TiO2 nanotubes are also obtained by further dividing the branched nanotubes when the applied voltage is further reduced step-by-step with a 1/root n factor. Enlargement and termination of TiO2 nanotubes occur when the anodization voltage increases by root n times. Alternating increase and decrease in the applied voltage lead to a more sophisticated hierarchical structure of TiO2 nanotubes. The fundamental understanding of these processes is discussed.