SEM images of size-reduced PS and porous and nanoporous Bi thin films. (a, c, e) SEM images (top view) of size-reduced PS of 200, 290, and 750 nm, respectively. (b, d, f) SEM images (top view) of porous Bi thin films using PS of 200, 290, and 750 nm, respectively. SEM images (tit view) of nanoporous Bi thin films shown in (f) before (g) and after (h) 100-nm-thick amorphous silicon oxide deposition.
Kim et al. Nanoscale Research Letters 2013 8:371 doi:10.1186/1556-276X-8-371