Eutectogel Skin Electrodes with Superior Adhesion, Sweat Resistance, and Long-Term Stability for Electrophysiological Signal Monitoring

Acquiring high-quality and long-term electrophysiological signals remains a critical challenge in human health monitoring. However, traditional commercial gel or paste skin electrodes are extremely susceptible to sweat, body motion, or environmental interference, seriously limiting the high-fidelity of outputted signals. Herein, a completely physical crosslinked eutectogel is prepared at room temperature, which displays low modulus yet high toughness because of the multiple hydrogen bonding interactions of konjac glucomannan (KGM) with other components of the gel network. This eutectogel not only exhibits superior adhesion to normal skin but also shows enhanced adhesion under sweating conditions, enabling seamless and ultraconformal skin contact. Furthermore, the eutectogel possesses excellent environmental stability, biocompatibility, and low interfacial contact impedance. Based on these merits, this eutectogel is used as a skin electrode for real-time monitoring of electrophysiological signals with extraordinary immunity to motion artifacts, sweat disturbance, and environmental interference, thereby providing a robust solution for the acquisition of electrophysiological signals. Graphical A physically crosslinked ALK eutectogel with superior adhesion to normal/sweaty skin, excellent low impedance persistence, remarkable environmental stability, and ultra-conformability with skin is developed for use as skin electrodes for real-time monitoring of electrophysiological signals, which exhibits extraordinary immunity to motion artifacts, sweat disturbance, and environmental interference, thus providing a robust solution for the acquisition of electrophysiological signals.