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Structures of TiO2 nanotubes on titanium (Ti-NTs). (A) SEM images of the Ti-NTs. Inset: cross-section view. Scale bar, 500 nm. (B) Pore size distribution of Ti-NTs determined by Nano Measurer. Error bars denote the standard deviations over triplicate measurements with the same implants. (C) XRD pattern of Ti-NTs before (bottom) and after (top) annealing treatment. A: anatase, R: rutile, and T: amorphous.
