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Preparation and Formation Mechanism of Al2O3 Nanowires by Electrochemical Oxidation Process

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Author(s): CHI Yong-Qing, CHEN Xu, LIU Shi-Bin, ZHANG Zhong-Lin, DUAN Dong-Hong, LI Yi-Bing, HAO Xiao-Gang

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 8;
Start page: 851;
Date: 2010;
Original page

Keywords: Al2O3 nanowires; electro-oxidation; preparation; mechanism

ABSTRACT
Al2O3 nanowires were prepared with the method of electrochemical oxidation followed by acid corrosion. The morphology and structure of Al2O3 nanowires were characterized by SEM, EDS and IR. The experimental results show that Al2O3 nanowires with hexagonal arrangement and large aspect ratio are formed from Al2O3 porous film by electro-oxidation of aluminum substrate. The diameter of the pure Al2O3 nanowires is from 16nm to 60nm, and decreases with the rising of electrolyte temperature, cell voltage and the prolonging of corrosion time. On the basis of characterization of nanowires on Al2O3 porous film, a possible formation mechanism was proposed.

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