A Wireless Health Monitoring System Accomplishing Bimodal Decoupling Based on an "IS"-Shaped Multifunctional Conductive Hydrogel.

Flexible wearable sensors with bimodal functionality offer substantial value for human health monitoring, as relying on a single indicator is insufficient for capturing comprehensive physiological information. However, bimodal sensors face multiple challenges in practical applications, including mutual interference between various modalities, and integration of excellent mechanical properties, interfacial adhesion, environmental adaptability and biocompatibility. Herein, the multifunctional hydrogel, synthesized through radical grafting and supramolecular self-crosslinking reactions, exhibits excellent thermal sensitivity (TCR = -1.70% °C), high toughness (9.31 MJ m ), wide strain range (0-600%), outstanding adhesion strength (36.07 kPa), antifreeze, visualization, water retention, biocompatibility, antibacterial and antioxidant capabilities. Leveraging its excellent conductivity, this hydrogel can be applied in electroluminescent, triboelectricity, electromyography monitoring, and message encryption. Moreover, the hydrogel is fabricated as bimodal smart sensors for strain and temperature monitoring. To avoid mutual interference between the two signals, a wearable system in "IS"-shaped configuration is innovatively designed based on finite element simulation results. The integration of "IS"-shaped hydrogel, flexible circuit modules, and data transmission form a closed-loop wearable platform for rehabilitation training of patients with arthritis or joint surgery. This strategy establishes a bimodal decoupling and self-calibrating system utilizing a single material to accurately detect multiple parameters, advancing wearable electronics and personalized medicine.