Highly Skin-Compliant Polymeric Electrodes with Synergistically Boosted Conductivity toward Wearable Health Monitoring.

Despite rapid advances in stretchable electrodes, successful examples of polymeric dry electrodes are limited. Especially in wearable health monitoring, it is urgent to develop biocompatible electrodes that possess intrinsic skin-compliance while maintaining a high conductivity. Herein, a strategy is demonstrated to synergistically regulate the interpenetration behavior and molecular crystallinity in the blend via embedding a novel double network, i.e. physically cross-linked poly(vinyl alcohol) (PVA) and covalently cross-linked polyethylene glycol diacrylate (PEGDA), into the PEDOT:PSS matrix. The favorable interaction energy between PVA and PEGDA enables well-distributed microstructure with finer phase separation in the film, affording a low Young's modulus of 16 MPa with a high conductivity of 442 S/cm. Consequently, the optimal polymeric electrode can acquire high-quality electromyogram (EMG) and electrocardiogram (ECG) signals. Our results provide a feasible approach for producing skin-compliant polymeric electrodes toward next-generation health monitors.