ABSTRACT
This chapter deals with the properties of voltammetric electrodes of very-small dimensions. When the dimensions of an electrode are decreased from the millimeter to the micrometer scale, many changes occur in the voltammetric behavior. Ultramicroelectrodes have seen increased use because they offer dramatic improvements in the quality of electrochemical data. The electrochemical responses at ultramicroelectrodes can differ greatly from those seen at conventional microelectrodes. When electrolysis occurs, a concentration gradient is generated between the electrode surface and solution. Fabrication of microelectrodes with the geometry of a disk embedded in an infinite insulating plane is easier to accomplish than forming spherical ultramicroelectrodes. Simulated voltammograms are superimposed on both measured traces.
