| Abstract: | Two new types of modified microelectrodes were used alone and in multi-microelectrode devices. Carbon fibers with diameters of 7.2 μm were modified either by electropolymerization, or by thermal polymerization of a mixture of monomers to give a thick coating of modifier around the cylindrical fiber. The modified fibers were then coated with an insulating layer. The tips of the electrodes were polished perpendicular to the axis of the fiber to give ring-modified disk electrodes. Copolymers of poly(vinylferrocene) and poly(vinylpyridine) with crosslinked polystyrene were used, and demonstrated behavior similar to that for surface modified electrodes, except that the electrodes could be polished to renew the surface. Multi-microelectrode devices were prepared. For example, a ring-modified working electrode, a silver/silver chloride coated practical reference electrode, and a platinum auxiliary electrode were used in a molded epoxy probe in electrolyte solution to give cyclic voltammograms that were similar to those expected for a ring-modified working electrode using traditional reference and auxiliary electrodes. |
