SELF-ORGANIZED FORMATION OF HEXAGONAL NANOPORE ARRAYS IN ANODIC ALUMINA |
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Authors: | Zhou Wei-y Li Yu-bao Liu Zu-qin Tang Dong-sheng Zou Xiao-ping and Wang Gang |
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Institution: | Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China |
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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. |
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Keywords: | anodic alumina nanochannel array self-organization porous film |
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