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anodic oxidation.  As a result,
one can obtain amorphous barrier-type oxides, crystalline barrier-type oxides or amorphous nanoporous oxides.  Currently, highly-ordered nanoporous anodic aluminum oxides (AAO) are obtained with various electrolytes to form nanostructures with a range of geometrical features.  This material can serve as a template for nanofabrication of variety of nanowires, nanotubes and nanodots.  In this way, porous alumina can be fabricated electrochemically through anodic oxidation of aluminum, yielding highly ordered arrays of nano-holes several hundreds down to several tens of nanometers in size.
Sol-gel chemistry offers a flexible approach to obtain a diverse range of materials.  It allows differing chemistries to be achieved as well as the ability to produce a wide range of nano-/micro-structures.  ....

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