Ultra‐Tough and Stable Leather‐Derived Gel Wearable Sensor: Enabling Multimodal Monitoring of Human Motion Signals and Distress Signal Transmission

ABSTRACT In extreme scenarios such as emergency rescue operations, conventional hydrogel sensors face significant challenges in achieving real‐time distress signal transmission due to their mechanical brittleness and stringent signal transmission requirements. This study introduced a multifunctional integrated carbon quantum dots (CCQDs)‐empowered ultra‐tough and stable leather‐based gel multimodal wearable sensor (SMT‐TL), aiming to achieve long‐term stable distress signal transmission. SMT‐TL utilized zeolite‐tanned sheep leather (SMT‐L) as a rigid substrate, with flexible polyacrylic acid (PAA) densely filling the gaps of collagen fibers within SMT‐L and enhancing hydrogen bond interactions. This resulted in the fabrication of an ultra‐tough, ultra‐stretchable, multifunctional integrated, and transparent “rigid‐flexible combination” SMT‐TL. It retained over 70% of the breaking strength (>13.5 MPa) of original SMT‐L, while achieving an elongation exceeding 590.0%, a toughness greater than 63.64 MJ/m 3 , and maintaining good transparency (a transmittance greater than 78.0% at 550 nm). The multifunctional integrated CCQDs enhanced and endowed SMT‐TL with conductivity and antibacterial properties, while the glycerol‐water binary solvent system ensured its anti‐freezing and moisture‐retention capabilities. Notably, SMT‐TL not only enabled real‐time monitoring of human motion signals but also successfully achieved stable transmission of distress signals. We believe that this study offers a new sensing material for extreme emergency communication, advancing intelligent integration of leather‐based wearable sensors with broad applications.