Figure 5.

SEM images of Ni-coated needle electrodes. (a, b) Selective coating method and (c, d) selective etching method for a sharp needle electrode. Scale bars: 10 μm in (a, c) and 1 μm in (b, d).

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