A Highly Stable and Durable Capacitive Strain Sensor Based on Dynamically Super-Tough Hydro/Organo-Gels

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yan Huang
  • Ruijuan Jiang
  • Weiming Gai

Detail(s)

Original languageEnglish
Article number2010830
Journal / PublicationAdvanced Functional Materials
Volume31
Issue number28
Online published25 Apr 2021
Publication statusPublished - 9 Jul 2021

Abstract

Capacitive-type strain sensors based on hydrogel ionic conductors have undergone rapid development benefited from their robust structure, drift-free sensing, higher sensitivity, and precision. However, the unsatisfactory electro-mechanical stability of the conventional hydrogel conductors, which are normally vulnerable to large deformation and severe mechanical impacts, remains a challenge. In addition, there is not enough research regarding the adhesiveness and mechanical properties of the dielectric layer, which is also critical for the mechanical adaptability of the whole device. Here, a dynamically super-tough capacitive-type strain sensor based on energy-dissipative dual-crosslinked hydrogel conductors and an organogel dielectric with high adhesive strength is developed. Combining with the mechanical advantages of the hydro/organo-gels, the capacitive strain sensor exhibits high stretchability and superior linear dependence of sensitivity with a gauge factor of ≈0.8% at 100% strain. Moreover, the sensor displayed ultrastability against various severe mechanical stimuli that can even survive unprecedentedly from extremely catastrophic car run-over by 20 times. With these synergistic mechanical advantages, the capacitive strain sensor is successfully applied as a highly-reliable wearable sensing system to monitor diverse faint physiological signals and large-range human motions.

Research Area(s)

  • capacitive strain sensors, hydrogels, organogels, super-tough strain sensors

Citation Format(s)