Highly conductive and robust epidermal dry electrode for long‐term interval biopotential monitoring

Long‐term interval electrophysiological (EP) signal monitoring plays a crucial role in the diagnosis and treatment of heart, brain, and muscle‐related diseases. However, traditional gel electrodes face significant challenges, including low conductivity, poor environmental stability, and possible harm to the human body. Herein, we present the design of a conductive epidermal dry electrode fabricated from an n‐type conducting polymer poly (benzodifurandione) (PBFDO) integrated with polyvinyl alcohol (PVA). This electrode features high conductivity (208 S/cm), biocompatibility, adaptability to skin, and excellent environmental stability. These characteristics enable the epidermal dry electrode to achieve reduced skin impedances and improved signal‐to‐noise ratios for EP signal monitoring, surpassing the performance of the commercial Ag/AgCl gel electrode. Moreover, the electrode can retain its remarkably high conductivity even under stringent conditions, including elevated temperatures of 30–100°C, 30%–100% relative humidity, and exposure to sweat. These exceptional qualities allow our dry electrodes to reliably and effectively monitor human EP signals over long intervals, highlighting their potential as high‐performance epidermal electrodes for continuous physiological monitoring.