Abstract: Existing hydrogel-based sensing platforms confront critical limitations regarding property integration, accelerated in-mass manufacturing, and signal consistency during long-term dynamic monitoring. We address this issue by establishing a novel nano-catalytic system based on graphene oxide and l-ascorbic acid in a conventional hydrogel matrix. This system i) enables rapid (∼ several minutes), spontaneous and large-scale fabrication under the ambient environment, ii) achieves mechanical-electrical coupling, and iii) maintains sensitive and reliable signals during sensing detection. The engineered hydrogel demonstrates a well-balanced mechanical performance, characterized by good tensile strength (235.9 kPa) and ultrahigh ductility (2522 %). Meanwhile, the corresponding sensors demonstrate high strain-dependent sensitivity (maximum Gauge factor = 11.23), highly stable repeatability, and a broad electromechanical range (∼ 2400 %). Benefiting from its excellent self-adhesion, this hydrogel-based electronic skin displays clinical-grade accuracy in continuous pulse wave and muscle contraction monitoring. We anticipate that this innovative strategy for designing multifunctional, integrated and reliable hydrogel materials provides a basis for next-generation wearable electronics.

Key words: Rapid self-gelation, Graphene oxide, Conductive hydrogel, Mechanics, Epidermal electronic skin