SYNTHETIC SEMICONDUCTOR DIAMOND ELECTRODES - A COMPARISON OF SINGLE-CRYSTAL AND POLYCRYSTALLINE FILMS

Results of the capacitance and voltammetric measurements performed wit h polycrystdline and single-crystal semiconductor diamond thin-film el ectrodes are compared. The quantitative impedance characteristics and kinetic characteristics in the Ce3+/4+ system are shown to be similar for both types of electrodes, whereas the electrode reaction kinetics for the diamond and the amorphous diamondlike carbon (a-C:H) electrode s differ. A preliminary conclusion is derived that the electrochemical behavior of polycrystalline diamond electrodes is basically determine d by the diamond crystallites, rather than by the disordered carbon fo rming the intercrystallite boundaries.