FABRICATION OF POLY(CHLOROTRIFLUOROETHYLENE) PRECIOUS-METAL COMPOSITEELECTRODES

Two procedures were examined for the fabrication of poly(chlorotrifluo roethylene)/precious metal composite electrodes in an attempt to reduc e the size of the active sites on the surface. A grinding procedure us ed with graphite was unsuccessful with platinum in that individual pla tinum particles became isolated from one another. As a result, the ele ctrode material was nonconducting. A procedure which involved sputter coating the poly(chlorotrifluoroethylene) with gold prior to compressi on molding was successful. Electrodes fabricated with this procedure h ad active areas less than about 1% of their geometric area and behaved as an array of isolated ultramicroelectrodes at times less than 0.1 s .