Abstract

Anodic TiO2 nanotubes have attracted intense attention in the research field of anodization due to their potential applications. Similar structures have been reported also for various transition metals. One of the important keys to grow such oxide nanostructure on the metals is the addition of adequate amount of fluorides into electrolyte used for anodization. However, recently, the formation of nanopores and nanotubes have reported on a few transition metals such as Ti, Nb and W by anodization in some fluoride-free electrolytes at elevated temperatures. In the present work, we report anodization of pure titanium in concentrated sulfuric acid electrolytes at elevated temperatures.

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