Kinetics of titania nanotube formation by anodization of titanium films

被引：19
|
作者：
Butail, Gorun [1 ]
Ganesan, P. G. [1 ]
Raddiar, M. [1 ]
Teki, R. [1 ]
Ravishankar, N. [1 ]
Duquette, D. J. [1 ]
Ramanath, Ganpati [1 ]
机构：
[1] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA
来源：
THIN SOLID FILMS | 2011年 / 519卷 / 06期
基金：
美国国家科学基金会;
关键词：
Titanium anodization; Kinetics; Activation energy; Oxygen diffusion; Titania; TIO2; NANOTUBES; ARRAYS; GROWTH; OXIDE;
D O I：
10.1016/j.tsf.2010.10.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report the kinetics of titania nanotube length evolution during anodization of titanium films. Our results show that the nanotube length increase is thermally activated, and governed by voltage-dependent activation energy 0.6 eV <= E-eff <= 1.1 eV expressed by E-eff = E-0-alpha V-anod where alpha is a constant and E-0=1.6 eV is a voltage-independent term. The proximity of E-0 to that of oxygen diffusion in titania suggests that oxygen transport across the titania walls at the pore bottoms is the rate-limiting step. These results provide insights into the mechanism of titania nanotube formation and a framework for their rational synthesis for applications. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：1821 / 1824
页数：4
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