Initiation and growth of self-organized TiO2 nanotubes anodically formed in NH4F/(NH4)2SO4 electrolytes
Initiation and growth of self-organized TiO2 nanotubes anodically formed in NH4F/(NH4)2SO4 electrolytes
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DOI：
10.1149/1.2008980
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发表时间：
2005-01-01
影响因子：
3.9
通讯作者：
Schmuki, P
中科院分区：
文献类型：
--
作者：
Taveira, LV;Macák, JM;Schmuki, P
在含有0.5 wt % NH4F的1 M (NH4)(2)SO4电解质中，用电位扫描至20 V-SCE，研究了自组织多孔TiO2在钛上的阳极形成。通过电化学、形态和成分信息的结合，我们发现扫描速率对多孔结构的形成和生长有显著的影响。在阳极氧化过程的第一阶段，形成前驱体阻挡型氧化膜；在这层薄膜下面，毛孔开始随机生长，然后自我组织。在优化的电化学条件下，可以获得高纵横比的TiO2纳米结构。这些纳米管状氧化层的单孔直径为90 ~ 110 nm，平均间距为150 nm，孔隙率为37 ~ 42%。目前的工作表明，初始屏障型层的性质对建立优化的孔隙生长条件有很大的影响。(c) 2005电化学学会。
The anodic formation of self-organized porous TiO2 on titanium was investigated in 1 M (NH4)(2)SO4 electrolytes containing 0.5 wt % NH4F by potential sweeps to 20 V-SCE. By a combination of electrochemical, morphological, and compositional information we show that the sweep rate has a significant influence on the initiation and growth of the porous structures. In the first phase of the anodization process, a precursor barrier type of oxide film is formed; underneath this film pores then start growing first randomly and then self-organize. High-aspect-ratio TiO2 nanostructures can be obtained under optimized electrochemical conditions. These nanotubular oxide layers have single-pore diameter ranging from 90 to 110 nm, average spacing of 150 nm, and porosity in the order of 37 - 42%. The current work indicates that the nature of the initial barrier-type layer has a strong influence on establishing optimized pore growth conditions. (c) 2005 The Electrochemical Society.