Double Network Ionic Conductive Hydrogel With Polyaniline Waterproof Shell for Stable and High‐Performance Wearable and Underwater Sensors

), good viscoelasticity, temperature resistance, frost resistance (-40°C unfrozen) and self-regeneration ability. Due to the synergistic effect between the dual network polymer chains, it has excellent fracture strain (1784.01%) and tensile strength (10.17 MPa). The environmental stability and versatility of PVA-salt-PANI hydrogel enable it to be used as a human motion sensor, and its waterproof property can reliably sense even in underwater environments. This work provides a novel design strategy for multifunctional sensors that operate reliably under harsh conditions.