Biomimetic Spinningof Strong and Hyperstable EutectogelFibers for Multifunctional Ionotronics

Stretchable eutectogel fibers hold exceptional promise for human physiological monitoring wearable electronics due to their nonvolatility, high ionic conductivity, and cost-effective fabrication. However, a significant challenge remains in achieving sufficient mechanical properties of eutectogel fibers for textile manufacturing and the ability to withstand long-term real-life usage, such as sweating and washing. Herein, hydrophobic eutectogel fibers (HEFs) with exceptional mechanical strength and environmental resilience were prepared via integrating prestretching and solvent evaporation-induced crystallization processes. The formation of abundant hydrogen bonds and the crystallization domain impart the HEFs with excellent tensile strength (5.5–22.5 MPa) and adjustable stretchability (75–375%). Most importantly, the HEF fibers keep remarkable stability (weight changes <2%) in aquatic environments under varying conditions of pH, humidity, detergent, and temperature. The HEF demonstrated multimodal sensing capabilities, including motion, weight, and temperature detection, with high-precision sensation (gauge factor = 2.2; temperature coefficient of resistance = 4.83 ± 0.2% K^–1) and stability. These advancements set a foundation for smart wearable devices, marking a significant progress in the fields of eutectogel-based intelligent health monitoring.