Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 157, Issue 5, Pages E69-E74Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3308599
Keywords
anodisation; nanofabrication; semiconductor growth; semiconductor materials; semiconductor nanotubes; semiconductor thin films; titanium compounds; transparency
Funding
- National Danish Research Council
- Danish Innovations consortium
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We demonstrate how the anodization direction and growth rate of vertically aligned, highly ordered TiO2 nanotube (NT) arrays can be controlled and manipulated by the local concentration of O-2 in the electrolyte. This leads to the growth of highly active TiO2 NT arrays directly on nonconducting substrates in a single step. By controlling the oxygen concentration, the electrical contact to the titanium film can be preserved until the entire film is anodized. This approach to growing transparent TiO2 NT films yields possibilities for using glass without any transparent conducting oxide coating as substrates. The role of molecular oxygen on the anodization and the means necessary for controlling the growth direction were investigated through the use of labeled oxygen and concentration gradient experiments.
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