Dechlorination-Triggered Nano-Welding: A Universal Strategy for Ultra-Stretchable, Low-Hysteresis Conductive Elastomer

Ultra-stretchable conductive elastomers with low-hysteresis recovery and anti-creep capability are indispensable for high-fidelity wearable sensors and human-machine interaction systems. Conventional carbon nanotube (CNTs)-based elastomers rely on weak physical interactions between CNTs and polymer matrices, failing to achieve robust chemical bonding and thus suffering from severe interfacial slippage. Here, we report a novel dechlorination-triggered nano-welding strategy to construct a 3D C─C covalent bonding network between CNTs and silicone polymers. Through thermodynamically favorable dechlorination of polyvinyl chloride (PVC)-derived chlorinated graphene-decorated CNTs (Cl-G/CNTs), a nano-welded interface is in-situ formed via synchronous covalent linkage and nanoscale mechanical interlocking. The resulting conductive elastomer exhibits exceptional stretchability of more than 870%, low-hysteresis recovery of 99.9%@25% strain, remarkable anti-creep performance of <0.14%, and exceptional mechanical durability (>10000 cycles). This high-performance elastomer has been successfully fabricated into high-resolution sensors, including wearable physiological monitors and an underwater piezometer with reliable depth-resolving capability (∼100 Pa). Our innovation breaks the intrinsic trade-off between organic–inorganic interfacial integration and mechanical-electrical synergy, establishes an ultra-stretchable and low-hysteresis conductive elastomer for high-fidelity wearable sensing.