Stretchable, fatigue-resistant, and temperature-tolerant multifunctional dual-network eutectogel based on metal salt-based deep eutectic solvent for strain sensors and triboelectric nanogenerators

The rapid advancement of flexible electronics has increased the demand for functional materials, particularly in terms of flexibility, environmental adaptability, and multifunctionality. In this study, we report a novel conductive dual-network eutectogel constructed using a low-melting-point metal salt-based deep eutectic solvent (MDES). By integrating physical and chemical crosslinking strategies, the eutectogel achieves a synergistic balance between mechanical flexibility and structural stability. The resulting material exhibits remarkable stretchability (916.49 %), excellent temperature tolerance (−20 to 55 °C), and reliable ionic conductivity. Moreover, it demonstrates strong universal adhesion (adhesive strength of 54.6 kPa on wood), outstanding fatigue resistance (maintaining a compressive strength of 135.56 kPa over 100 cycles), and high optical transparency (92 %). When implemented in strain sensors and triboelectric nanogenerators, the eutectogel enables precise detection of human motion signals and efficient energy harvesting. This work offers a promising strategy for the development of next-generation multifunctional eutectogels for flexible and wearable electronics.