Abstract Conditions for a self-organized formation of ordered hexagonal structure in anodic alumina were investigated, using oxalic or sulphuric acid as an electrolyte. Highly-ordered nanopore arrays with pore densities of 9×109-6.5×1010cm-2 and high aspect ratios over 3000 were fabricated by a two-step anodization process. The array exhibits characteristics analogous to a two-dimensional polycrystalline structure of a few micrometres in size. The interpore distance can be controlled by changing the electrolyte and/or the applied voltage. The formation mechanism of ordered arrays is consistent with a previously proposed mechanical stress model, i.e., the repulsive forces between neighbouring pores at the metal/oxide interface promote the formation of hexagonally ordered pores during the oxidation process.
Received: 30 September 2000
Accepted manuscript online:
Fund: Project supported in part by the National Natural Science Foundation of China (Grant No.59772026).
Cite this article:
Zhou Wei-ya (周维亚), Li Yu-bao (李玉宝), Liu Zu-qin (刘祖琴), Tang Dong-sheng (唐东升), Zou Xiao-ping (邹小平), Wang Gang (王刚) SELF-ORGANIZED FORMATION OF HEXAGONAL NANOPORE ARRAYS IN ANODIC ALUMINA 2001 Chinese Physics 10 218
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