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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/).
(a) Sensing mechanism. When the fiber is stretched, the concentration of graphene per unit volume remains the same. (b) Scheme diagram of the fixation of PDMS fiber structure. (c) Optical setup for the strain test.