A high-performance porous flexible composite film sensor for tension monitoring

Yuanyuan Feng, Rui Cai, Yi Zhou, Zonghao Hu, Yanlong Wang, Daiqiang Liu, Sensen Han, Jiankai Zhao, Lisheng Xu, Qingshi Meng

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Abstract

Flexible, wide strain sensing range and lightweight sensors are showing increasing significance in structural health monitoring compared with conventional hard sensors which typically have a small strain range, heavyweight, and large volume. In this work, salt particle precipitation and mechanical coating methods are used to fabricate porous graphene platelet (GNP)/polydimethylsiloxane (PDMS) flexible sensors for tension health monitoring. The signal transformation through the Back Propagation (BP) algorithm is integrated to allow the overall monitoring data comparable with other sensors. The results reveal that the flexible sensor with low content of GNP (0.1 wt%-0.25 wt%) leads to better flexibility, allowing tensile strains are all over 200%. In addition, due to the enhanced deformation capacity of the pore structures, it reaches high sensitivity (1-1000) under 65% strain and a fast response time (70 ms) under 5% strain at 60 mm/min. It also shows high performance through the fatigue test (20,000 cycles) under 5% strain and can effectively responds to bending and torsion. Meantime, the sensor shows an obvious response to temperature. Overall, the prepared flexible composite sensor in this work has the advantages of wide strain sensing range, full coverage conductive network, and lightweight, and shows the potential in structure health monitoring in the near future.
Original languageEnglish
Article number26285
Pages (from-to)26285-26296
Number of pages12
JournalRSC Advances
Volume12
Early online date15 Sep 2022
DOIs
Publication statusE-pub ahead of print - 15 Sep 2022

Bibliographical note

Open Access CC BY NC

Keywords

  • Graphene
  • Tension monitoring
  • Reliability
  • Porous flexible film
  • High sensitivity

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