Figure 1.

SEM images of TiO2 nanotubes. (a) Top view and (b) side view before TiCl4 treatment, and (c) top view and (d) side view after TiCl4 treatment.

Meen et al. Nanoscale Research Letters 2012 7:579   doi:10.1186/1556-276X-7-579
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