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Multiform Nanostructure Formation on Pure Aluminum Surface During Electrochemical Oxidation in a Fluorine-Based Electrolyte

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Multiform alumina nanostructures including nanopores, nanotubes, nanosprings, and nanoribbons are obtained on the surface of pure aluminum in a solution containing sodium fluoride and orthophosphoric acid. Nanopores generated first due to the oxide film breakage under the fluorine ion attack at high anodic potentials. With the deep penetration of the fluorine ions, nanotubes formed. The wall of the tubes was dissolved in part by the electrolyte, resulting in the formation of nanosprings. Nanoribbons were obtained in the regions with severe pre-deformation such as surface scratching and indentation. It is deduced that the dynamic balance between the aluminum substrate oxidation and the surface oxide film dissolution by the fluoride is the reason for generating the multiform nanostructures. The mechanical deformation state and/or the surface conditions of the aluminum also affect the morphology of the nanostructures.
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Document Type: Short Communication

Publication date: 2012-01-01

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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