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Ultrasensitive, highly stretchable, self-healing and robust quaternized chitosan-based conductive hydrogel for
Yanju Zhang1, Meng Zhang1, Yajuan Li1
1Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, and College of Science, Hebei University of Science and Technology, Yuxiang Street 26, Shijiazhuang 050018, PR China.
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Conductive hydrogels are widely used in electronic skin and wearable sensors. Their inherent self-adhesion, exceptional sensitivity, and remarkable toughness guarantee the consistent and reliable operation of flexible motion sensors. However, creating chitosan-based conductive hydrogels with all these properties remains challenging. In this study, a triple-network hydrogel was synthesized by incorporating poly (vinyl alcohol) (PVA), chitosan quaternary ammonium salt (QCS) and poly(N-(2-Hydroxyethyl) acrylamide)-Co-Sodium acrylate copolymer (P(HEAA-Co-AANa)). Lithium chloride (LiCl) is introduced to enhance conductivity. The optimized hydrogel shows good conductivity (0.77 S/m), high tensile strain (~2113 %) and strong mechanical properties (463 kPa). The assembled sensors have high sensitivity, and enable precisely monitoring human motions. This study offers a simple, eco-friendly way to develop high-performance chitosan-based conductive hydrogels.
