A quick and dependable technique has been developed that allows us to selectively produce anodized TiO2 in the form of nanotubes. The process employs mild chemical conditions and ambient temperature. The method can consistently produce nearly 100% surface coverage of nanotubes within 10 min of anodizing. Anodizing in relatively high pH electrolytes for 1 hour permitted us to produce nanotubes of 2μm length. We attribute the repeatability of our results to a brief pre-anodizing etching step that consistently leads to excellent anodizing results. Without this etching step, we experienced very poor consistency in that only small patches of titania nanotubes were formed.
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Sklar, G.P., Singh, H., Mahajan, V. et al. Nanoporous Titanium Oxide Morphologies Produced by Anodizing of Titanium. MRS Online Proceedings Library 876, 12 (2005). https://doi.org/10.1557/PROC-876-R1.2