Reduced Graphene Oxide-Polydimethylsiloxane Based Flexible Dry Electrodes for Electrophysiological Signal Monitoring

Graphene-based dry electrodes have shown considerable promise in electrophysiological signal monitoring applications by providing a comfortable, irritant-free alternative to traditional wet electrodes. The proposed electrode was fabricated using a spray-coating technique by depositing reduced graphene oxide (rGO) on a polydimethylsiloxane (PDMS) substrate. The rGO/PDMS dry electrodes exhibit the capability to capture and transmit weak bio-electrical signals such as Electrocardiogram (ECGs) and Electromyogram (EMGs) without significant attenuation or distortion. Experimental results show that when compared to conventional wet Ag/AgCl electrodes, the fabricated rGO/PDMS electrodes measure higher-quality ECG signals with improved SNRs while offering similar contact quality and electrode-skin impedance despite being a dry electrode. The fabricated rGO/PDMS electrodes demonstrated excellent performance and applicability making them suitable for use in wearable long-term health monitoring devices.