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. 2019 Apr 6;19(7):1656. doi: 10.3390/s19071656

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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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The mechanical response of the GNP sheets and the graphene sensors. (a) The relationship of the resistance ratio of the GNP sheet with the applied pressure. (b) The relationship of the resistance ratio of the GNP sheet with its stretching strain. (c) The relationship of the resistance ratio of the GNP sheet packed with PU film with its stretching strain. (d) Hysteresis performance of the graphene sensor. R₀ is the initial resistance value. R is an instantaneous resistance value. L₀ is the length of the GNP sheet. L is the instantaneous length of the GNP sheet.