Solid-State Microelectrodes for Flow-Cell Analysis Based on Planar Back-Side Contact Transducers

This paper presents an overview of the studies carried out in the recent years in our laboratory, on the construction of different solid-state microelectrodes for flow-cell analysis. The microelectrodes were based on planar transducers made from a printed circuit board and manufactured as back-side contact structures, which facilitate their mounting in a flow-cell. Performances of the polymeric membrane ion-selective: coated-wire microelectrodes and microsensors with a polyHEMA layer containing internal electrolyte are compared. Conducting polymer – polypyrrole doped with ester of sulfosuccinic acid – was added to the PVC membranes to develop all-solid-state microelectrodes without internal electrolyte solution, exhibiting good potential stability in time. Finally, all-solid-state reference microelectrodes based on back-side contact transducers are prepared and examined. These structures were applied as reference electrodes in flow-cell measurements with potassium-selective planar microelectrodes.

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