Energy-dissipative dual-crosslinked hydrogels for dynamically super-tough sensors

基於能量耗散型雙交聯水凝膠的超韌性動態感測器

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

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Author(s)

  • Ruijuan Jiang
  • Weiming Gai
  • Shuangkun Lv

Detail(s)

Original languageEnglish
Pages (from-to)2764-2776
Journal / PublicationScience China Materials
Volume64
Issue number11
Online published21 Jun 2021
Publication statusPublished - Nov 2021

Abstract

In the fields of electronic skin and soft wearable sensors, intrinsically stretchable conductors undergo rapid development; however, practical applications of artificial skinlike materials/devices have not been realized because of the difficulty in combining the electromechanical properties and sensing performance. Contrarily, insoluble inorganic conductive domains in the hydrogel matrix are generally incompatible with surrounding elastic networks, decreasing the mechanical strength. Usually, the hydrogels are vulnerable either to severe mechanical stimuli or large deformation, especially when notches are induced. In this study, based on an energy-dissipative dual-crosslinked conductive hydrogel, a mechanically durable and super-tough strain sensor was developed. The highly soft yet dynamically tough hydrogel demonstrated high ionic conductivity (30.2 mS cm−1), ultra-stretchability (>600% strain), and superior linear dependence of strain sensitivity with a maximum gauge factor of 1.2 at 500% strain. Because of these advantageous synergistic effects, the resultant hydrogel strain sensor demonstrated reliable and stable detection of a large range of human motion and subtle vibrations. Moreover, it impressively exhibited super toughness that could endure consecutive treading pressure and even retain normal operation after 20 times of car run-over on the road. These demonstrations highly confirm the sensor’s superior mechanical durability and reliability, displaying great potential in developing next-generation mechanically adaptable sensors.
本征可拉伸導體在電子皮膚和柔性可穿戴傳感器領域中正在快速發展. 然而, 由於電子-機械性能和傳感性能難以完美結合,人造皮膚材料/器件的實際應用尚未實現. 一方面是由於傳統的水凝膠導體中摻雜的無機導電劑通常與周圍的彈性網路不相容, 從而導致機械強度降低. 另一方面由於水凝膠通常受到嚴重的機械撞擊或較大的變形, 特別是當缺口出現時, 容易受到損壞. 本研究中, 我們基於具有耗散能力的雙交聯導電水凝膠, 開發出一種機械強度高且柔韌性好的應變傳感器. 具有動態韌性的水凝膠導體顯示出較高的離子電導率(30.2 mS cm−1), 超長的拉伸性(>600%應變)和優異的線性正相關的應變敏感性, 在500%應變下其最大應變靈敏因數為1.2. 基於這些協同作用, 製備的水凝膠應變傳感器能夠可靠穩定地檢測人體的大幅度運動和小幅度動作的微小振動. 此外, 它還具有超強的柔韌性, 可以承受連續的踩踏壓力, 甚至在道路上被行駛的車輛碾壓20次後仍能保持正常運行. 這些表徵證實了其卓越的機械耐久性和可靠性, 在開發下一代實用性傳感器方面顯示出巨大潛力.

Research Area(s)

  • energy-dissipative, hydrogels, strain sensors, super-tough, wearable