THE ELECTROCHEMICAL ACTIVITY OF BORON-DOPED POLYCRYSTALLINE DIAMOND THIN-FILM ELECTRODES

The electrochemical activity of ''as grown'' boron-doped polycrystalline diamond thin film electrodes has been studied using cyclic voltammetry, chronoamperometry, and ac impedance without external illumination. The resistivity of these materials after doping is ca. 10 ohm-cm. The diamond electrodes possess a low double layer capacitance and a relatively high polarization resistance toward surface oxidation. Slow electrode kinetics are observed for Fe(CN)63-/4- at the ''as grown'' surface; however, the electrode response was observed to be extremely stable over a 2-month period as compared with freshly polished glassy carbon. The results suggest that diamond electrodes may have suitable properties as an electrode material for use in electroanalysis.