Chronoamperometric and Voltammetric Characterization of Gold Ultramicroelectrode Arrays

Abstract Some prototypes of photolithographic‐built arrays of gold ultramicroelectrodes (UMEAs) have been electrochemically characterized and compared with a normal‐size electrode. The achievement of steady‐state conditions, effects of supporting electrolyte and the role of conditioning and activation have been considered. The results obtained show that it is possible to monitor the effective area of those devices by chronoamperometry, which confirms the convenience of using the internal auxiliary and reference electrodes and this evidences that steady‐state currents are holding in a wide range of scan rates. Additionally, some preliminary tests show the promising features of gold UMEAs in flow systems like FIA or HPLC.