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. 2018 May 23;10(6):573. doi: 10.3390/polym10060573

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© 2018 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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Digital images of conductive three-dimensional sponges with working LEDs on the surface at various strains and shapes: (A) twisted (B) bended (C) stretched at 30% strain (D) compressed at 30% strain [39].