Self-organized porous titanium oxide prepared in H2SO4/HF electrolytes
Self-organized porous titanium oxide prepared in H2SO4/HF electrolytes
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DOI：
10.1149/1.1545192
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发表时间：
2003-03-01
影响因子：
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通讯作者：
Schmuki, P
中科院分区：
文献类型：
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作者：
Beranek, R;Hildebrand, H;Schmuki, P
在含有低浓度 HF（0.05-0.4 wt%）的 H2SO4 电解质中研究了钛上多孔 TiO2 的形成。在优化的电解质条件和扩展的极化下，获得了高度有序的多孔TiO2，其由单孔径为140 nm、孔间距为150 nm的孔阵列组成。在形成过程中，观察到显着的电流振荡，其幅度很大程度上取决于电解质的 HF 含量。电化学、扫描电子显微镜和 X 射线光电子能谱研究表明，多孔层是在 TiO2 形成和氧化物溶解的竞争下形成的，极限厚度约为 500 nm，并且所研究的系统完全自排序的时间尺度约为几个小时。 (C) 2003 年电化学协会。
The formation of porous TiO2 on titanium was investigated in H2SO4 electrolytes containing low concentrations of HF (0.05-0.4 wt %). Under optimized electrolyte conditions and extended polarization, highly ordered porous TiO2 is obtained that consists of pore arrays with single pore diameter of 140 nm and a pore spacing of 150 nm. During the formation process, significant current oscillations are observed with an amplitude which depends strongly on the HF content of the electrolyte. Electrochemical, scanning electron microscope and X-ray photoelectron spectroscopy investigations show that the porous layer forms under a competition of TiO2 formation and oxide dissolution up to a limiting thickness of similar to500 nm, and that the time scale for complete self-ordering for the investigated systems is in the order of several hours. (C) 2003 The Electrochemical Society.