Gas‐Permeable Organic Electrochemical Transistor Embedded with a Porous Solid‐State Polymer Electrolyte as an on‐Skin Active Electrode for Electrophysiological Signal Acquisition

Abstract Fibrous nanomesh organic electrochemical transistors (OECTs) embedded with porous solid‐state polymer electrolytes (SPE) are developed for use as on‐skin active electrodes. The OECTs exhibit a microporous structure, which makes them gas permeable, allowing for the evaporation of sweat vapor when they are in conformable contact with the skin. The non‐volatility of the SPE allows for the long‐term functionality of organic electrochemical transistors. The superior electrical characteristics of the OECT can be utilized to locally amplify on‐skin bio‐potential signals. The acquisition of high‐quality electrocardiogram signals is demonstrated in this study. This porous transistor‐type on‐skin active electrode enables the long‐term acquisition of high‐quality electrophysiological signals.