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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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Fabrication process of an e-skin piezoresistive sensor. (a) Laser engraving cavities on a hard polydimethylsiloxane (h-PDMS) mold. (b) Standard PDMS (s-PDMS) spin-coating on the engraved mold. (c) Peeling off the flexible s-PDMS film from the mold. (d) Poly(methyl methacrylate) (PMMA) spin-coating on the s-PDMS film. (e) Carbon coating spin-coating on the previous film. (f) Final micro-structured film after curing of carbon coating. (g) Final device with a silver-ink stripe on the smooth edge of each film. None of the steps are to scale.