Figure 5.
SEM top view of nanotubes obtained after an etching time of (a) 1.75, (b) 3.5, (c) 5.25 and (d) 7 h. The etching solution contains 0.5 wt% of NH3 and 0.5 wt% of CTAB. Inset: TEM images of the nanotubes (scale bar: 50 nm).
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