From anodic TiO2 nanotubes to hexagonally ordered TiO2 nanocolumns |
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Authors: | T. RuffR. Hahn P. Schmuki |
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Affiliation: | Department of Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany |
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Abstract: | We report on the formation of hexagonally ordered TiO2 nanocolumnar layers by electrochemical oxidation in a fluoride containing electrolyte, using self-organizing nanotube formation conditions at elevated potentials and low temperatures. The influence of the substrate temperature on the nanocolumn morphology and composition is investigated and characterized by FE-SEM and EDX. The origin of these nanocolumns can be attributed to a thickening of the inner tube wall of the double wall structure of self-organized TiO2 nanotubes. Furthermore, a transition from nanocolumnar to nanotubular structure can be established by changing the applied voltage or applying a post-immersion treatment. |
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Keywords: | TiO2 Nanotubes Temperature Diameter Nanocolumns |
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