Figure 3
From: Highly Stretchable Electrodes on Wrinkled Polydimethylsiloxane Substrates

Surface roughness characterizations of various PDMS surfaces.
(a) as prepared PDMS surface; (b) PDMS after 60 s plasma treatment; (c) PDMS after 20 s plasma treatment; (d) PDMS after plasma (20 s) and SDS joint treatment.