Bioinspired Micro-Spines for a High-Performance Spray Ti3C2Tx MXene-Based Piezoresistive Sensor

Recently, wearable and flexible pressure sensors have sparked tremendous research interest, and considerable applications including human activity monitoring, biomedical research, and artificial intelligence interaction are reported. However, the large-scale preparation of low-cost, high-sensitivity piezoresistive sensors still face huge challenges. Inspired by the specific structures and excellent metal conductivity of a family of two-dimensional (2D) transition metal carbides and nitrides (MXene), and the high-performance sensing effect of human skin including randomly distributed microstructural receptors, we fabricate a highly sensitive MXene-based piezoresistive sensor with bioinspired micro-spinous microstructures formed by a simple abrasive paper stencil printing process. The obtained piezoresistive sensor shows high sensitivity (151.4 kPa-1), relatively short response time (<130 ms), subtle pressure detection limit of 4.4 Pa and excellent cycle stability over 10,000 cycles. The mechanism of the hi...