Self-Ordering Behavior of Anodic Porous Alumina Formed in Malonic Acid Solutio

摘要

Anodic porous alumina, having highly self-ordered nanohole array, is a promising candidate for template to produce new nanoschale devices. However, highly ordered porous alumina takes place only at the limited anodizing voltage which is specific to the electrolyte used for anodizing: i.e., sulfuric acid at 25V, oxalic acid at 40V and phosphoric acid at 195V, corresponding to the pore intervals of 63nm, 100nm, and 500nm, respectively. To expand application field of anodic porous alumina, the fabrication of ordered porous alumina with arbitrary pore interval is required. In the present study, we examined the formation behavior of anodic porous alumina in malonic acid solution with focusing on the effect of anodic conditions on self-ordering of cell array. In the malonic acid electrolyte, the porous alumina having pore intervals between 200nm to 400nm would be obtainable because of achievable anodizing voltage.