Chitosan-based conductive hydrogels have attracted extensive attention in electronic skins,human health monitoring,and flexible wearable sensors.In this work,MXene was dispersed in acrylic acid-chitosan solu-tion,and then the acrylic acid monomer was in situ polymerized to synthesis the chitosan-poly(acrylic acid)-MXene hydrogels(CS-PAA-MXene).CS-PAA-MXene shows excellent mechanical properties.The tensile strength of the CS-PAA-MXene is as high as 0.6 MPa,and its elongation at break and toughness reach 1 450%and 2.6 MJ·m-3,respectively.CS-PAA-MXene can adhere to various surfaces,including glass,plastic,rubber,copper and aluminum,etc.The maximum peeling force on the glass can reach 175 N·m-1.After the cut CS-PAA-MXene contacts each other for 2.5 s,its resistance value returns to the pre-cut value,suggesting CS-PAA-MXene has excellent self-healing performance.CS-PAA-MXene strain sensors have been successfully used to detect a wide range of human move-ments,such as the joint flexions of finger,elbow and knee.Due to the cationic charge and antibacterial properties of chitosan,CS-PAA-MXene conductive hydrogels will have a good application prospect in self-adhesive and high-extensibility flexible sensors.
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