Flexible conducting platforms based on PEDOT and graphite nanosheets for electrochemical biosensing applications

SCOTTO, JULIANA; PICCININI, ESTEBAN; VON BILDERLING, CATALINA; CORIA-ORIUNDO, LUCY L.; BATTAGLINI, FERNANDO; KNOLL, WOLFGANG; MARMISOLLE, WALDEMAR A.; AZZARONI, OMAR

APPLIED SURFACE SCIENCE

ELSEVIER SCIENCE BV

Año: 2020 vol. 525

0169-4332

Carbon nanomaterials are usually employed for improving the electrical and electrochemical properties ofconducting polymer electrodes. However, low-cost of production, scalable simple procedures and adequate integration of the components at the molecular level within the composites become a challenge when dealing withreal life applications. In this work, we present a novel strategy for producing graphite nanosheets (GNS) dispersed in the solvent employed then for the chemical synthesis of PEDOT, which allows producing compositenanofilms on plastic substrates for the construction of transparent and flexible all-polymer electrodes. By anoptimized experimental procedure, we achieved a proper integration of PEDOT and GNS within ultrathin(< 100 nm) composite films and good enough conductivity to ensure adequate electrochemical responsewithout the requirement of conducting base electrodes. We tested the performance of these platforms for realapplications by developing glucose biosensors by molecular integration of supramolecular assembly of glucoseoxidase and an electroactive polyelectrolyte on top of the PEDOT-GNS coatings. The incorporation of GNS doesnot only improve the voltammetric response of the resulting all-polymer electrodes but also produces a betterintegration of the electrochemically active assembly.