Abstract
We report on an approach to obtain anodic self-organized TiO2 nanotube layers with a significantly improved tube morphology. Before the anodic tube growth, a rutile layer is formed on the Ti substrate by high temperature oxidation in air. This layer protects the tube tops during anodization against chemical etching in the fluoride-containing electrolyte. As a result, much longer (higher aspect ratio) nanotubes can be grown that still have an intact tube top (i.e., the formation of undesired etching-induced "nanograss" and "nanospikes" is suppressed). This technique is particularly significant for applications that require open tubes and coherent tube walls.
Original language | English |
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Pages (from-to) | C17-C20 |
Journal | Electrochemical and Solid-State Letters |
Volume | 12 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2009 |
Externally published | Yes |