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. 2019 Feb 21;19(4):899. doi: 10.3390/s19040899

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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General view and close-up view of s-PDMS semi-spheres peeled off from optimized molds (circles with a diameter of 200 µm, engraved with a laser power of 7.5 W and a laser speed of 0.254 m/s) with different pitches and with carbon coating only or with both PMMA and carbon coating. Below the SEM images are displayed the measurements of the real height, diameter, and pitch of the semi-spheres. Note that the values correspond to average values ± standard deviation of a minimum of three measurements.