Figure 2.

SEM image of a carbon nanotube nanoneedle. (a) A tungsten tip and (b) an AFM tip. Scale bar: 10 μm. Insets show a magnified view (scale bar: 1 μm).

An et al. Nanoscale Research Letters 2011 6:306   doi:10.1186/1556-276X-6-306
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