A Stretchable and Sweat-Adhesive 3D Graphene Eutectogel Electrode for EMG Monitoring

Epidermal electrodes play an essential role in accurately capturing electrophysiological signals, which are critical for human health monitoring and human–computer interactions. However, these electrodes face challenges such as the inability to maintain long-term adhesion and limited adaptability to skin deformation, which hinder their sustained and repeated use. In this work, we developed a stretchable and sweat-adhesive epidermal electrode for accurate recording of electromyography (EMG) signals. This electrode is based on the chemical vapor deposition (CVD) of graphene foam and eutectogel. This copolymer exhibits excellent tensile properties (500–600%), sweat adhesion (19 kPa), and low impedance (99 Ω). It provides both structural support and an interfacial conductive medium for the graphene foam, effectively reducing contact impedance with skin. This stretchable and sweat-adhesive epidermal electrode presents an interesting scheme for the preparation of wearable devices.