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(Color online) Schematic fabrication process to generate wrinkle patterns [(a)–(d)]. SEM and AFM images of surface patterns when stretching/release of PDMS film either sequentially [(e)] or simultaneously [(f)].
(Color online) Two sets of sequential optical microscope images of two equal-stretched PDMS samples (20% strain) subjected to two different stretch releasing processes: sequentially [(a)–(j)] and simultaneously [(m)–(r)], respectively, and their corresponding illustrative sketches, (k)–(l) and (s), respectively. Scale bar in (a) is applicable to all images.
(Color online) Characterization of ripple and herringbone structures formed under different conditions. The strains listed in the legends indicate the prestrain amount before oxygen plasma treatment. The straight lines in (a) and (b) are linear fitting of the data. (a) Final ripple width vs release strain at different oxygen plasma times and stretch amounts. (b) Log-log plot of final ripple and herringbone widths vs oxygen plasma time. (c) Final ripple and herringbone amplitude (left axis) and herringbone length (right axis) vs oxygen plasma time.
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