Fibrillary Gelation of PEDOT:PSS Nanofiber for Organic Electrochemical Transistors in Wearable Bioelectronics

PEDOT:PSS, a conductive polymer commonly used in organic electronics and bioelectronics, offers high electrical and ionic conductivity, solution processability, and biocompatibility. In this study, we present a novel method to enhance PEDOT:PSS fiber with high conductivity. Moreover, a robust and breathable nanofiber mat electrode with a large surface area could be demonstrated.<br/>Designed to ensure skin adaptability and stability through theoretical mechanical analysis, this nanofiber mat electrode maintains impedance stability under daily use, thereby addressing durability issues for long-term applications. Its breathability, high surface area, and reduced interfacial impedance allow for continuous use even under significant and repeated skin deformation.<br/>This PEDOT:PSS nanofiber electrode exhibits an impressive electrical conductivity of approximately 200 S*cm^(-1) and a volumetric capacitance of approximately 80 F*cm^(-3), making it highly suitable for organic electrochemical transistors (OECTs). Utilizing the nanofiber mat electrode, we fabricate an OECT with a transconductance of 10 mS in depletion mode, demonstrating its potential for continuous sweat ion sensing applications. These results indicate that PEDOT:PSS nanofiber has significant potential as a reliable component for noninvasive skin electronics, especially sweat sensors and other wearable bioelectronic devices.<br/>&lt;script src="chrome-extension://hhojmcideegachlhfgfdhailpfhgknjm/web_accessible_resources/index.js"&gt;&lt;/script&gt;