Self-healing carrageenan-driven Polyacrylamide hydrogels for strain sensing
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lf-healing carrageenan-driven polyacrylamide hydrogels for strain sensing *
FAN ZiWen, DUAN LiJie & GAO GuangHui
*
Polymeric and Soft Materials Laboratory, School of Chemistry and Life Science and Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China Received May 27, 2020; accepted June 28, 2020; published online November 12, 2020
Conductive hydrogels have attached considerable attention due to their good stretchability, excellent conductivity when they are applied in soft electronics. However, to fabricate a flexible hydrogel sensor with excellent toughness and good self-healing properties remains a challenge. In this work, we assembled a dual physical-crosslinking (DPC) ionic conductive polyacrylamide/ carrageenan double-network (DN) hydrogel. This hydrogel has excellent fracture tensile stress and toughness, and demonstrates rapid self-recovery and self-healing ability due to the unique dual physical-crosslinking structures. Besides, the hydrogel is highly conductive by adding some conductive ions. As a result, the hydrogel-based sensor can stably detect human motions and physiological signals. The work provides novel ideas for the development of flexible sensing devices. hydrogel, self-healing, carrageenan, polyacrylamide, strain sensing Citation:
Fan Z W, Duan L J, Gao G H. Self-healing carrageenan-driven polyacrylamide hydrogels for strain sensing. Sci China Tech Sci, 2020, 63, https://doi. org/10.1007/s11431-020-1682-3
1 Introduction In recent years, with the rapid development of flexible electronic materials and sensing technology, flexible strain sensors have received increasing interests from scholars [1– 3]. Flexible electronic sensors can be used to detect various human physiological signals, including human motions (e.g., wrist, elbow and knee flexion) and physiological signals (e.g., speaking, swallowing and breathing) [4,5]. Wearable sensors convert physiological signals into electrical signals in the form of signal transmission [6,7], which have many applications in the fields of health monitoring [8], flexible touch screen [9,10], electronic skin [11,12], and soft robots [13], etc. Traditional wearable sensors were prepared by integrating conductive materials, such as conductive macromolecules [14–16], metallic materials [17,18] and carbon-based mate*
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rials [19–21] into flexible substrates, which exhibited poor stretchability, low sensitivity and narrow sensing range. Therefore conductive hydrogels with excellent mechanical properties, good biocompatibility, and human tissue-like flexibility have attracted tremendous attention in the field of wearable sensors [22,23]. For example, Guan et al. [24] fabricated an adhesive and anti-freezing hydrogel as an epidermal strain sensor by introducing casein and LiCl into the polyacrylamide hydrogel system. Wang et al. [25] fabricated a semi-interpenetrating hydrogel by comprising linear zwitterionic polymers (PSBMA) into the physically
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