TiO2 nanotubes with tunable morphologies

Titanium anodic oxide layers with a bottle shaped nanotubular structure have been grown in an electrolyte containing NH 4 F, applying voltage steps. The grown layers were analyzed using scanning and transmission electron microscopy (SEM and TEM), and Rutherford backscattering spectroscopy (RBS). The...

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Bibliographic Details
Published in:RSC advances 2014-01, Vol.4 (17), p.62576-62585
Main Authors: Hernández-López, J. M, Conde, A, de Damborenea, J. J, Arenas, M. A
Format: Article
Language:English
Subjects:
Anodic
Bottles
Electric potential
Morphology
Nanostructure
Oxides
Titanium dioxide
Transmission electron microscopy
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Summary:Titanium anodic oxide layers with a bottle shaped nanotubular structure have been grown in an electrolyte containing NH 4 F, applying voltage steps. The grown layers were analyzed using scanning and transmission electron microscopy (SEM and TEM), and Rutherford backscattering spectroscopy (RBS). The results show that a concentration of 0.15 M of NH 4 F in the anodizing bath, and a step of 10 to 20 V produces an oxide with a double morphology comprised of nanotubes at the oxide/metal interface and nanopores at the oxide/electrolyte interface of the anodic layer. Higher concentration of F − in the bath, 0.3 and 0.45 M NH 4 F, enhanced the chemical dissolution of the anodic layer resulting in nanotubular structures along the oxide layer. Therefore, the bottle shaped nanotubular structures that show a well defined morphology are obtained in a bath containing a concentration of 0.3 M NH 4 F and applying a voltage step of 10-20 V. Titanium anodic oxide layers with a bottle shaped nanotubular structure have been grown in an electrolyte containing NH 4 F, applying voltage steps.
ISSN:2046-2069
DOI:10.1039/c4ra11457d