Gradient Cu/Ti₃C₂T _x MXene-Coated Textile Pressure Sensor with High Sensitivity and a Wide Sensing Range

Asa fundamental component for health monitoring, human-machineinteractions, and electronic skin, a flexible pressure sensor alwaysfaces the challenge of either a limited sensing range or inferiorsensitivity. To overcome the trade-off between high sensitivity anda wide sensing range, here, we constructed a mass-gradient distributionof Cu onto a textile coated with Ti3C2T x nanosheets through an additive-assistedelectrodeposition technique. The synergistic effects of the flexibleand knitted structural textile substrate and the mass-gradient distributionof the as-deposited Cu gave a continuous change in not only the contactarea but the conductivity of the contact points of the sensor undercompressive loading. Thus, the sensor exhibited both a high sensitivityof up to 67.91 kPa(-1) and a wide sensing range of905 kPa, simultaneously. In addition, the sensor demonstrated excellentcycling stability after 1000 cyclic loadings, a fast response/recoverytime of 30/50 ms, and excellent breathability, which endows it withwide applications, including monitoring human physiological signals,transmitting encrypted information, and distinguishing the spatialdistribution of pressure in real time.