Figure 5.

Surface roughness by AFM. (a) 2D and (b) 3D AFM images of the smooth surface, and (c) 2D and (d) 3D AFM images of the self-assembled nanotip W BE surface.

Prakash et al. Nanoscale Research Letters 2013 8:527   doi:10.1186/1556-276X-8-527
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