MXene-based double-network organohydrogel with excellent stretchability, high toughness, anti-drying and wide sensing linearity for strain sensor

Gel-based strain sensors could be capable of converting external stimuli into electrical signals to realize real-time monitoring, leading to the flourishing development in flexible wearable device. However, how to trade off robust mechanical properties against strain sensitivity is still a great challenge. Herein, the MXene-PAM/SA-Ca 2+ double-network (DN) organohydrogel was prepared by a facile one-pot and two-step method. The formation of physical interaction between Ca 2+ , glycerol and polymer chain endowed the DN organohydrogel with excellent stretchability (1170%), robust fracture strength (540 kPa) and high toughness (3.8 MJ m −3 ). At the same time, the intrinsic characteristic of glycerol also brought anti-drying and low-temperature resistance to it. Due to doping MXene, the organohydrogel-based strain sensor performed outstanding sensitivity with GF = 1.21, especially a linearity trend in the wide strain range of 0–600%. Similarly, the sensor exhibited satisfactory response time (0.6 s) to external stimuli and accurately capture the motion signal of human, providing a gigantic potential in the fields of e-skin. • An MXene-PAM/SA-Ca 2+ organohydrogel with excellent mechanical property has been developed. • The organohydrogel could respond to stimuli after 24 h at −20 °C by introducing glycerol as cryoprotectant. • The organohydrogel-based strain sensor showed a linearity trend in the wide strain range of 0–600%. • It was competent to precisely recognize human joint movement when assembled into a strain sensor.