Abstract
Alumina nanowire arrays standing on the surface of a porous anodic alumina membrane
have been achieved by first forming a porous anodic alumina membrane with parallel
Y-branched nanochannels by reducing the applied anodizing voltage by a factor of 
in the anodization process of high-purity Al foil, and then chemically etching the
Y-branched nanochannel alumina membrane in an aqueous phosphoric acid solution. The
novel nanostructures may be used for two-dimensional photonic bandgap structural
materials.
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