ABSTRACT Conductive hydrogels have emerged as a promising class of materials for flexible electronics, bio‐monitoring, and soft robotics, owing to their tunable mechanical properties, excellent water retention, and superior electrical conductivity. However, the existing conductive hydrogels suffer from insufficient mechanical strength and limited sensing sensitivity, which seriously hinders their practical application in flexible sensors. Herein, we report a conductive hydrogel with strong mechanical properties and high sensitivity prepared by free radical polymerization. This design combines a double‐network structure with a nanocomposite reinforcement strategy. The hydrogel network is composed of polyacrylamide (PAM) and carboxymethyl chitosan (CMCS) and is stabilized by hydrogen bonding. Two‐dimensional MXene nanosheets are uniformly dispersed in the precursor solution by ultrasonication, significantly improving the mechanical properties, conductivity, and sensing ability of the material. The optimized MXene‐PAM‐CMCS exhibits excellent comprehensive performance: a fracture stress of approximately 270.84 kPa and a fracture strain of about 3643.54%; a conductivity of 0.16 S m −1 ; and high strain sensitivity with a gauge factor (GF) of 11.99. Moreover, the hydrogel maintains robust mechanical integrity after swelling equilibrium. These results indicate that our hydrogel design has broad application prospects in high‐performance electronic skin and wearable health monitoring devices.
Cui et al. (Mon,) studied this question.
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