Abstract
Porous anodic aluminum oxide (AAO) membranes have been widely used as templates forgrowing nanomaterials because of their ordered nanochannel arrays with high aspect ratioand uniform pore diameter. However, the intrinsic growth behavior of an individualAAO nanochannel has never been carefully studied for the lack of a means tofabricate a single isolated anodic alumina nanochannel (SIAAN). In this study, wedevelop a lithographic method for fabricating a SIAAN, which grows into a poroushemispherical structure with its pores exhibiting fascinating morphological evolutionduring anodization. We also discover that the mechanical stress affects the growthrate and pore morphology of AAO porous structures. This study helps revealthe growth mechanism of arrayed AAO nanochannels grown on a flat aluminumsurface and provides insights to help pave the way to altering the geometry ofnanochannels on AAO templates for the fabrication of advanced nanocomposite materials.
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