SOLVENT-RESISTANT CARBON ELECTRODES SCREEN-PRINTED ONTO PLASTIC FOR USE IN BIOSENSORS

A three electrode design using solvent resistant materials is reported , enabling the production of screen printed electrodes for use in bios ensor applications involving water-miscible organic solvents. Heat sta bilised polyester sheets were used as base materials in combination wi th carbon basal tracks and an epoxy-based polymer protective coating. The new electrodes avoid problems with solvent induced baseline shifts displayed by conventional screen-printed electrodes. The material for the underlying basal track has been changed from silver to carbon ink to reduce the number of materials involved in the production and avoi d possible interferences. In addition, the design is readily applied i n biosensor applications. Different methods for the incorporation of a rhodium catalyst are discussed. The application of the electrode syst em modified with the rhodium catalyst for the amperometric detection o f hydrogen peroxide in different concentrations of methanol, isopropan ol and ethanol is demonstrated.