Journal
CURRENT NANOSCIENCE
Volume 11, Issue 5, Pages 560-571Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/1573413711999150608144742
Keywords
Aluminum; anodic oxide film; anodizing; electrolyte; porous aluminum oxide; self-ordering
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Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI
- Kurata Memorial Hitachi Science and Technology Foundation
- Toyota Physical & Chemical Research Institute Scholars
- Japan Aluminum Association
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Anodizing of aluminum and its alloys is widely investigated and used for corrosion protection, electronic devices, and micro-/nanostructure fabrication. Anodizing of aluminum in acidic solutions causes formation of porous aluminum oxide films, which consists of numerous hexagonal cells perpendicular to the aluminum substrate, and each cell has nanoscale pores at its center. Recently, highly ordered porous aluminum oxide has been widely investigated for various novel nanoapplications. In this review article, we introduce the fundamentals of anodic oxide films including barrier and porous oxides. Then, we summarize the electrolyte species used so far for porous oxide fabrication and describe the self-ordering conditions during anodizing in these electrolyte solutions. Fabrication of highly ordered porous oxides through the vertical section can be achieved by a two-step anodizing and nanoimprint technique. Various nanoapplications based on the ordered porous oxide are also introduced.
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