Figure 3.

SEM images of nanopillars formed from the highly doped Si after 10-min etching. In (a) λ1, (b) λ2, (c) λ3, and (d) λ4 solutions. The distance mark in (d) indicates the range of the nanoporous base layer under the Au film and nanopillars.

Wang et al. Nanoscale Research Letters 2013 8:42   doi:10.1186/1556-276X-8-42
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