Abstract
One-step synthesis of freestanding zirconium oxide nanotube (ZrO2-NT) membranes was obtained by direct electrochemical anodization of zirconium (Zr) substrates in aqueous electrolytes (mixture of 1 M (NH4)2SO4 and 0.75 M NH4F). The maximum membrane area was 9 cm2 and showed translucency from 400 to 700 nm. The ZrO2-NTs have an external diameter of ∼80 nm, an internal diameter of ∼55 nm, and a length of ∼22.5 μm. Moreover, the ZrO2-NTs showed a cubic crystal structure after anodization. The results are highly promising for applications requiring independent ZrO2 nanotube membranes.
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