Graphene and Poly(3,4-ethylene dioxythiophene): Poly(4-styrene sulfonate) on Nonwoven Fabric as a Room Temperature Metal and Its Application as Dry Electrodes for Electrocardiography

Highly conductive, metal-like poly(ethylene terephthalate) (PET) nonwoven fabric was prepared by coating poly(3,4-ethylenedioxythiophene): poly(4-styrene sulfonate) (PEDOT:PSS) containing dimethylsulfoxide (DMSO) onto PET nonwoven fabric previously coated with graphene/graphite. The sheet resistance of the original nonwoven fabric decreases from >80 MΩ/□ to 1.1 Ω/□ after coating with 10.7 wt% graphene and 5.48 wt% PEDOT:PSS with a maximum current at breakdown of 4 A. This sheet resistance is lower than previously reported sheet resistances of fabrics coated with graphene films, PEDOT:PSS films, or PEDOT:PSS coated fabrics from the literature. The effect of temperature on the resistance of graphene/PEDOT:PSS coated fabric has revealed that the resistance decreases with increasing temperature, analogous to semiconductors, with a clear semiconductor-metal transition occurring at 290 K. Finally, a coating of 18 wt% graphene/graphite and 2.5 wt% PEDOT:PSS (Rs =5.5 Ω/□) screen printed on the nonwoven fabric was...