Images of the other kind of nanopillar. (a) AFM image of the other kind of nanopillar. (b, c) Enlarged image of the marked pattern in (a) along different directions. (d, e) The corresponding cross sections of (b) and (c).
Zhang et al. Nanoscale Research Letters 2013 8:280 doi:10.1186/1556-276X-8-280