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Electrochemical Tuning of Titania Nanotube Morphology in Inhibitor Electrolytes

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : Electrochimica Acta

Source : Electrochimica Acta, Volume 55, Number 11, p.3703-3713 (2010)

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Keywords : Anodizations, Aspect ratio, Electrochemical corrosion, Electrochemical impedance, Electrolytes, Ethylene, Ethylene glycol, Fluorine, Hydrofluoric acid, Morphology, Nanotubes, Pore diameters, Pressure drop, Solvents, TiO, TiO2 nanotubes, Titanium, Titanium dioxide

Campus : Kochi

School : Center for Nanosciences

Center : Amrita Center for Nanosciences and Molecular Medicine Move, Nanosciences

Department : Nanosciences and Molecular Medicine

Year : 2010

Abstract : The electrochemical behavior of fluorine containing electrolytes and its influence in controlling the lateral dimensions of TiO2 nanotubes is thoroughly investigated. Potentiostatic anodization is carried out in three different electrolytes, viz., aqueous hydrofluoric acid (HF), HF containing dimethyl sulphoxide (DMSO) and HF containing ethylene glycol (EG). The experiments were carried out over a broad voltage range from 2 to 200 V in 0.1-48 wt% HF concentrations and different electrolytic compositions for anodization times ranging from 5 s to 70 h. The chemistry that dictates how the nature of electrolytes influences the morphology of nanotubes is discussed. Electrochemical impedance spectra were recorded for varying compositions of all the electrolytes. It was observed that composition of the electrolyte and its fluorine inhibiting nature has significant impact on nanotube formation as well as in controlling the aspect ratio. The inhibiting nature of EG is helpful in holding fluorine at the titanium anode, thereby allowing controlled etching at appropriate voltages. Thus our study demonstrates that HF containing EG is a promising electrolytic system providing wide tunability in lateral dimensions and aspect ratio of TiO2 nanotubes by systematically varying the anodization voltage and electrolyte composition. © 2010 Elsevier Ltd. All rights reserved.

Cite this Research Publication : V. C. Anitha, Dr. Deepthy Menon, Nair, S. V., and Prasanth, R., “Electrochemical Tuning of Titania Nanotube Morphology in Inhibitor Electrolytes”, Electrochimica Acta, vol. 55, pp. 3703-3713, 2010.

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