Highly stretchable, sensitive and healable polyurethane-urea/graphene nanocomposite sensor for multifunctional applications
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Date
2024
Authors
Yu, Y.
Xu, Z.
Xu, L.
Li, Y.
Liu, T.
Meng, Q.
Su, X.
Kuan, H.C.
Dai, J.
Ma, J.
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Journal article
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Thin-Walled Structures, 2024; 198(111660):1-13
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Flexible wearable electronic devices offer promising potential for monitoring physiological signals. However, creating a single sensor that integrates high tensile strength, sensitivity, self-healing capabilities and a wide working range presents a significant and multifaceted challenge. This study reports a novel nanocomposite consisting of polyurethane-urea elastomer (PUU) and graphene nanoplatelets (E-GNPs) that are mechanochemically modified with diethyltoluene diamine ethacure 100. A low electrical percolation threshold was observed at 4.17 vol% E-GNPs. The sensor based on the PUU nanocomposite at 7 vol% of E-GNPs has revealed a gauge factor up to 17.57 and a wide working range of 361.76 % with high tensile strength of 19.73 MPa. It can withstand 20,000 cycles at 50 % strain. The sensor exhibits negative temperature dependence at 20–100 °C, with a resolution of 0.01/°C at 36–40 °C. Treatments with solvents and heat enable a healing efficiency for sensitivity of up to 70.46 %. The healable sensor enables real-time monitoring of temperature and strain signals, making it ideal for wearable devices in human health and sports monitoring.
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Copyright 2024TheAuthors.Published by Elsevier Ltd. This is an open access article under the CCBY license (http://creativecommons.org/licenses/by/4.0/)