Ultrasensitive mechanical/thermal response of a P(VDF-TrFE) sensor with a tailored network interconnection interface

Bo Li (), Chuanyang Cai, Yang Liu, Fang Wang, Bin Yang, Qikai Li, Pengxiang Zhang, Biao Deng, Pengfei Hou () and Weishu Liu ()
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Bo Li: Southern University of Science and Technology
Chuanyang Cai: Xiangtan University
Yang Liu: Huazhong University of Science & Technology
Fang Wang: Chinese Academy of Sciences (CAS)
Bin Yang: Southern University of Science and Technology
Qikai Li: Southern University of Science and Technology
Pengxiang Zhang: Southern University of Science and Technology
Biao Deng: Southern University of Science and Technology
Pengfei Hou: Xiangtan University
Weishu Liu: Southern University of Science and Technology

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Ferroelectric polymers have great potential applications in mechanical/thermal sensing, but their sensitivity and detection limit are still not outstanding. We propose interface engineering to improve the charge collection in a ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) copolymer (P(VDF-TrFE)) thin film via cross-linking with poly(3,4-ethylenedioxythiophene) doped with polystyrenesulfonate (PEDOT:PSS) layer. The as-fabricated P(VDF-TrFE)/PEDOT:PSS composite film exhibits an ultrasensitive and linear mechanical/thermal response, showing sensitivities of 2.2 V kPa−1 in the pressure range of 0.025–100 kPa and 6.4 V K−1 in the temperature change range of 0.05–10 K. A corresponding piezoelectric coefficient of −86 pC N−1 and a pyroelectric coefficient of 95 μC m−2 K−1 are achieved because more charge is collected by the network interconnection interface between PEDOT:PSS and P(VDF-TrFE), related to the increase in the dielectric properties. Our work shines a light on a device-level technique route for boosting the sensitivity of ferroelectric polymer sensors through electrode interface engineering.

Date: 2023
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DOI: 10.1038/s41467-023-39476-4

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