Development of Ti 3 C 2 T x /MoS 2 x Se 2(1– x ) Nanohybrid Multilayer Structures for Piezoresistive Mechanical Transduction

High-performance piezoresistive physical sensors have attracted significant attention due to their promising utilization in a wide range of applications such as electronic skin, human–machine interface, flexible touch displays, healthcare monitoring, etc. Two-dimensional materials are among the most pertinent candidates for their employment as active sensing materials in piezoresistive sensors. Also, incorporating 2D materials as nanohybrids is being extensively explored to find its synergistic effect on the sensing performance. This report demonstrates for the first time the use of a hybrid Ti 3 C 2 T x /MoS 2 x Se 2(1– x ) -based piezoresistive sensor, and its detailed explanation on the underlying physics behind the improved piezoresistive mechanical transduction is put forward. The fabricated Ti 3 C 2 T x /MoS 2 x Se 2(1– x ) -based hybrid piezoresistive sensor displayed an enhanced sensitivity and gauge factor value, i.e., ∼13.43 kPa –1 and ∼3.51, respectively. In addition, the fabricated sensor has displayed the exceptional stability of ∼2500 cycles for a pressure sensor and ∼3000 cycles for a strain sensor. The physical sensing phenomena demonstrated by the formation of MXene/MoSSe nanohybrid heterojunctions is explained in detail via two types of resistances: (i) volume effect, i.e., intrinsic piezoresistive due to layered nanostructure, and (ii) interface effect, i.e., Schottky Barrier height modulation at the metalloid–semiconductor interface. Further, the successful demonstration of the Ti 3 C 2 T x /MoS 2 x Se 2(1– x ) -based piezoresistive sensor was realized in gait detection and fluid flow monitoring in the biomimetic blood vessel, which opens up possibilities in advanced healthcare and biomedical applications.