Figure 3.

FESEM images of close-packed monolayer PS sphere arrays. With various diameter fabrication by (a) 3-min (sample A) and (b) 6-min O2 (sample B) plasma etching and then Ar plasma etching.

Hsu et al. Nanoscale Research Letters 2013 8:224   doi:10.1186/1556-276X-8-224
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