A novel DES-enhanced sodium alginate-based conductive organohydrogel fiber for high-performance wearable sensors

Conductive organohydrogel fibers based on sodium alginate (SA) exhibit remarkable flexibility and electrical conductivity, making them ideal candidates for conformal skin adhesion and real-time monitoring of human activity signals. However, traditional conductive hydrogels often suffer from issues such as uneven distribution of conductive fillers, and achieving the integration of high mechanical strength, stretchability, and transparency using environmentally friendly methods remains a significant challenge. In this study, a novel and sustainable strategy was developed to fabricate dual-network organohydrogel fibers using sodium alginate as the primary material. By incorporating a deep eutectic solvent (DES) composed of choline chloride and glycerol into the SA matrix through wet spinning, the mechanical properties of the hydrogel were significantly enhanced, achieving an elongation at break of 817 % and a tensile strength of 5.12 MPa. The resulting fibers exhibit stable electrical conductivity and outstanding performance as wearable sensors, enabling accurate and reliable real-time monitoring of diverse human activities. This innovative approach highlights the potential of SA-based conductive hydrogels for multifunctional sensing applications. By addressing the limitations of traditional hydrogels and leveraging the biocompatibility and scalability of SA, this method opens new avenues for advanced wearable electronics and biomedical devices that are sustainable, durable, and versatile.