Electrodes for Stable Electrophysiological Signal Monitoring

Abstract

Epidermal electronic components have received much attention for their potential in personal healthcare and human-machine interaction (HMI). However, their low conductivity hinders their practical applications. Here, we developed a multifunctional flexible dry epidermal electrode for biopotential recording using modified poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) doped with Polyethylene glycol(PEG). PEG was introduced into PEDOT:PSS to enhance its conductivity. We prepared electrodes with a high conductivity of 130 S/cm and 23% tensile strength. The electrodes conform well to the morphology of human skin and therefore form a stable and intimate interface with the skin, resulting in low contact impedance between the electrode and the skin and high-quality recording of biopotentials. It is capable of accurately recording electrocardiogram (ECG), electrooculogram (EOG), and electromyogram (EMG) signals.