Self-supported semi-interpenetrating polymer networks as reactive ambient sensors

Interpenetrating polymer networks including polyethylene oxide, polybutadiene and poly 3,4-ethylenedioxythiophene (PEDOT) were studied by cyclic voltammetry, potential steps and current steps in LiClO4 propylene carbonate solutions. The chronoamperometric results show a current maximum after reduction at high cathodic potentials. At the maximum the oxidation occurs under chemical kinetic control the current being a function, described by the reaction kinetics, of the electrolyte concentration and working temperature. Despite the good results, the involved charge is not constant when the variables are changed, as required for sensing conditions. Chronopotentiometric results allow a perfect control of this charge and the electrode potential or the consumed electrical energy sense, at any time of the reaction, the electrolyte concentration. © 2010 Elsevier B.V. All rights reserved.