Self-organized porous TiO2 and ZrO2 produced by anodization
Self-organized porous TiO2 and ZrO2 produced by anodization
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DOI：
10.1016/j.corsci.2005.05.041
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发表时间：
2005-12
影响因子：
8.3
通讯作者：
H. Tsuchiya;J. Macák;Andrei Ghicov;L. Taveira;P. Schmuki
中科院分区：
文献类型：
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作者：
H. Tsuchiya;J. Macák;Andrei Ghicov;L. Taveira;P. Schmuki
本工作研究了自组织高深宽比二氧化钛和二氧化锆纳米管层的电化学形成。自组织多孔层的形成和生长可以直接通过阳极氧化实现，而不需要在含氟电解液中使用任何模板。多孔层的形貌受电解液组成、pH和准确的极化处理(如从开路电位到阳极氧化电位的电位扫描速度)等电化学条件的影响。对于钛，形成的纳米管层的直径约为。20 nm至100 nm，长度约为0.25μm至2.5μm取决于电解液和pH。另一方面，对于Zr，直径为50 nm的管子最大可达约50 nm。可以增长17μm的长度-在这种情况下，一个关键参数是潜在的扫描速率。钛和锆在纳米管层厚度上的巨大差异表明生长机制不同，这可能是由于电化学形成的氧化物的化学溶解速度不同所致。
The present work investigates the electrochemical formation of self-organized high aspect ratio TiO2and ZrO2nanotube layers. The formation and growth of a self-organized porous layer can be achieved directly by anodization without any templates in fluoride containing electrolytes. The morphology of the porous layers is affected by the electrochemical conditions such as the electrolyte composition, the pH and the exact polarization treatment (such as the potential sweep rate from the open-circuit potential to the anodizing potential). For Ti, nanotube layers are formed with diameters varying from approx. 20nm to 100nm and lengths from approx. 0.25μm to 2.5μm depending on the electrolytes and pH. On the other hand, for Zr, tubes of 50nm in diameter and up to approx. 17μm in length can be grown—a key parameter in this case is the potential sweep rate. The large difference between Ti and Zr in the achievable thickness of nanotube layers indicates a difference in the growth mechanism which may be based on the different chemical dissolution rates of electrochemically formed oxides.