Controlled interconversion of nanoarray of ta dimples and high aspect ratio ta oxide nanotubes.

@article{Elsayed2009ControlledIO,
  title={Controlled interconversion of nanoarray of ta dimples and high aspect ratio ta oxide nanotubes.},
  author={H. A. El-sayed and Viola I. Birss},
  journal={Nano letters},
  year={2009},
  volume={9 4},
  pages={
          1350-5
        }
}
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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