Figure 5.

XRD of the nanotubes before and after annealing in air at 350 °C for 2 h. The anodzation time was 1 h. A, anatase form of TiO2; Si, silicon substrate; Ti, unanodized Ti.

Chappanda et al. Nanoscale Research Letters 2012 7:388   doi:10.1186/1556-276X-7-388
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