Stress-deconcentrated ultrasensitive strain sensor with hydrogen-bonding-tuned fracture resilience for robust biomechanical monitoring

Recently, rapid advances in flexible strain sensors have broadened their application scenario monitoring of various mechanophysiological signals. Among sensors, the crack-based drawn increasing attention subtle mechanical deformation due to high sensitivity. However, early generation and propagation cracks conductive sensing layer result a narrow working range, limiting large biomechanical Herein, we developed stress-deconcentrated ultrasensitive (SDUS) sensor with ultrahigh sensitivity (gauge factor up 2.3 × 106) wide range (0%–50%) via incorporating notch-insensitive elastic substrate micro-crack-tunable layer. Furthermore, highly amine-based polymer-modified polydimethylsiloxane without obvious hysteresis endows our SDUS response time (2.33 ms) external stimuli. The accurate detection radial pulse, joint motion, vocal cord vibration proves capability for healthcare human-machine communications.