Simple fabrication of highly ordered AAO nanotubes

Abstract

In this paper, simple fabrication of hexagonally well-ordered Anodic Aluminium Oxide (AAO) nanotubes with high aspect ratio was reported. AAO nanotubes were obtained by two-step anodization. High purity aluminium foils were anodized in oxalic acid solution by applying 40 V constant voltage at 0 degrees C for 30 min. Removing of AAO barrier layer was discussed in details. AAO nanotubes were characterized by Scanning Electron Microscopy (SEM). SEM micrographs show that fabricated AAO nanotubes are approximately 70 nm in diameters and 9 mu m in lengths with 90 nm interpore distances in a relatively large area of about 2 cm(2). Fabricated AAO nanotubes have high aspect ratio approximately 130.