Controlled interconversion of nanoarray of ta dimples and high aspect ratio ta oxide nanotubes.
Nano Lett
; 9(4): 1350-5, 2009 Apr.
Article
em En
| MEDLINE
| ID: mdl-19245238
ABSTRACT
We report the controlled formation of either high-aspect-ratio Ta(2)O(5) nanotubes or an organized nanoarray of Ta dimples by Ta anodization in a single H(2)SO(4) + HF solution. Dimpled Ta is the stable surface morphology in the first few seconds, followed by the growth of dense and fully vertically aligned Ta(2)O(5) nanotubes (up to 2.5 microm long). After 2 min, the dimpled surface morphology reappears, related to the build-up of a resistive Ta fluoride surface layer.
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MEDLINE
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En
Ano de publicação:
2009
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Article