Synthesis of Laminated Alumina Films by AC Oxidation

Laminated alumina films, which resemble structures of shell nacre, have been fabricated via the ac oxidation of aluminum in different electrolytes. A variety of films composed of alumina layers of 50-200 nm thickness, were obtained by varying both the ac power supply and the type of electrolyte. The...

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Bibliographic Details
Published inJournal of the Electrochemical Society Vol. 160; no. 6; pp. D240 - D245
Main Authors Segawa, Hiroyo, Okano, Hironaga, Wada, Kenji, Inoue, Satoru, Byun, Ikjoo
Format Journal Article
LanguageEnglish
Published The Electrochemical Society 01.01.2013
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Summary:Laminated alumina films, which resemble structures of shell nacre, have been fabricated via the ac oxidation of aluminum in different electrolytes. A variety of films composed of alumina layers of 50-200 nm thickness, were obtained by varying both the ac power supply and the type of electrolyte. The total film thicknesses were observed to increase with total charge. The thickness of each layer increased with ac voltage, but the anodizing time had little effect on the film thickness. The rate of formation of these layers was also affected by the type of electrolyte employed. These results suggested that the laminated structures were formed by the repeated cycles of formation of an alumina film via the anode reaction and generation of hydrogen gas via cathode reaction.
Bibliography:108306JES
ISSN:0013-4651
1945-7111
DOI:10.1149/2.108306jes