| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1488254 | Materials Research Bulletin | 2014 | 5 Pages |
•Porous anodic alumina (PAA) can be formed on unpolished Al substrate.•The interpore distance of PAA may extend to as large as 2036 nm.•The anodizing voltage can reach up to 800 V.•Fabrication of PAA under ultrahigh voltage does not need a very low temperature.
Fabrication of ordered porous anodic alumina (PAA) with ultra-large interpore distances (Dint) is still a great challenge because of the occurrence of the breakdown or burning during anodization under ultrahigh voltages. Herein, the anodizing of aluminum at ultrahigh voltages (600–800 V) is realized in a series of mixed electrolytes consisting of solutions of citric acid in ethylene glycol and aqueous phosphoric acid solutions. Ordered PAA and patterned Al substrate with ultra-large Dint (1400–2036 nm) have been fabricated by two-step anodization on unpolished substrates successfully.
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