Self-ordering of anodic porous alumina formed in organic acid electrolytes

被引:289
作者
Ono, S [1 ]
Saito, M [1 ]
Asoh, H [1 ]
机构
[1] Kogakuin Univ, Fac Engn, Dept Appl Chem, Shinjuku Ku, Tokyo 1638677, Japan
关键词
anodic porous alumina; self-ordering; high-current-density; organic acid; pre-treatment;
D O I
10.1016/j.electacta.2005.05.058
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
New self-ordering porous alumina films were fabricated in organic acid electrolytes. Highly ordered cell arrangements of porous alumina films were realized in malonic acid at 120 V and tartaric acid at 195 V having 300 nm and 500 nm pore intervals, respectively. Self-organization was achieved at the maximum voltage required to induce high-current-density anodization while preventing burning, i.e., an extremely high-current flow concentrated at local points. The cells of the film grown at a high field must be pressed against each other, so that the self-ordering proceeds with the porous layer growth. When the self-ordering of cell arrangement proceeds, the cells became smaller. To improve the regularity of the cell configuration, a low electrolyte temperature and a relatively high electrolyte concentration were effective for maintaining a high-current-density to prevent burning. Surface flatness was an essential factor for self-ordering, however, the surface oxide film produced by electropolishing an aluminum substrate prevented quick pore growth in the organic acids having a low dissociation constant. It is confirmed that electropolishing followed by alkaline treatment was most appropriate as the pre-treatment in preparing flat Surfaces. (C) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:827 / 833
页数:7
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