Abstract
The preparation of highly ordered anodic porous alumina through-hole membranes by two-layer anodization using concentrated sulfuric acid solution is described in detail. After the formation of a porous alumina layer in an oxalic acid solution, a highly soluble alumina layer was formed at the lower part of the first alumina layer by second anodization in a concentrated sulfuric acid solution. A porous alumina through-hole membrane was then obtained by selective dissolution of the second alumina layer in an appropriate etchant. The residual Al could be reused for the preparation of the ordered anodic porous alumina because an ordered concave array corresponding to the hole arrangement of the detached porous alumina membrane was maintained at the surface of the residual Al even after the etching treatment. The present process allows the high-throughput preparation of ordered anodic porous alumina through-hole membranes.
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