Abstract
A novel nanostructured sandwich PAA/Al/PAA (PAA: porous anodic alumina) wassuccessfully designed and fabricated by anodic oxidation on both sides of an Al foil. Thepore size of the PAA membranes was controlled by choosing appropriate voltage, lengthof anodic oxidization time, temperature and electrolytes. The thickness of thecentral Al layer was varied by changing the anodic oxidization time. We showthat the nanostructured sandwich PAA/Al/PAA can be used as a template infabricating homogeneous or heterogeneous nanostructured sandwiches by depositingthe same kind of material or different materials into the PAA membranes of thesandwich. We also show that it can be used to prepare nanowires and bipolarelectrodes. In addition, Al nanosheets or Al nanowalls were produced by removingthe PAA films completely or partially. Nanogaps between the PAA films werealso formed by etching away the centre Al layer of the sandwich structures. Thethickness of these nanosheets, nanowalls and nanogaps was controlled by choosingappropriate electrolytes and electrochemical parameters during the anodic oxidationof Al. All these nanostructures offer novel opportunities for both fundamentalresearch and technological applications of low dimensional nanostructure systems.
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