Abstract
In this work, porous anodic aluminum oxide with crater nanochannels is discovered for the first time while Al is anodized in NH4F electrolyte at high voltages. The unique structure of crater nanochannels is distinctly different from that of general porous anodic aluminum oxide (AAO) and anodic TiO2 nanotubes. A central channel appears and a circle of nanopores surround the channel while there is only one kind of pore in typical AAO and anodic TiO2 nanotubes. This finding may significantly facilitate the fabrication of special structures in AAO and anodic TiO2 nanotubes.
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