Low impedance surface coatings via nanopillars and conductive polymers

Low impedance electrodes are of significant importance for the development of highly sensitive sensors and bioelectronic devices. The integration of biomolecules into these devices enforces high demands on the interface materials in terms of biocompatibility and electronic properties. Here we present the establishment of the well studied conductive polymer (CP) PEDOT/PSS for ultra thin electrode coatings. The polymer film thickness is adjusted via spin coating and reaches film thicknesses well below 100nm. Thereby, the polymer layer increases the interface capacity and allows a tuning of the electrode impedance. A further reduction of the impedance is achieved by applying CP coatings on gold nanopillar electrode surfaces. Schematic of polymer coated gold nanopillars electrode in a cyclic voltammetry experiment.