Figure 2.

SEM images of Ni-doped TiO2 nanotubes. (a) After anodization. (b) Annealed at 525°C. (c) Annealed at 625°C. (d) Cross-section image of the nanotubes annealed at 525°C.

Li et al. Nanoscale Research Letters 2014 9:118   doi:10.1186/1556-276X-9-118
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