Publication Details (including relevant citation information):
Chem. Mater., 2008, 20 (20), pp 6477–6481
We report for the first time synthesis of high-aspect-ratio tantalum oxide nanotube arrays via one-step anodization of Ta foil. The use of aqueous electrolytes containing HF:H2SO4 in the volumetric ratios 1:9 and 2:8 results in formation of ordered nanodimpled surfaces with 40−55 nm pore diameters over the potential range 10−20 V. The addition of 5−10% of either ethylene glycol (EG) or dimethyl sulfoxide (DMSO) to the HF and H2SO4 aqueous electrolytes resulted in the formation of Ta oxide nanotube arrays up to 20 μm thick, either securely anchored to the underlying Ta film or as robust free-standing membranes, as dependent upon the anodization time and applied voltage.
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