Figure 2.

SEM images of TNT grown on Ti wire using the anodisation technique. (a) The top surface showing cracks, (b) the entire structure showing TNT on Ti wire with dimensions, (c) the cross-section showing array of TNTs and (d) the hollow nanotubes.

Gulati et al. Nanoscale Research Letters 2011 6:571   doi:10.1186/1556-276X-6-571
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