Development of a Compact and Multifunctional Sensor Array

This study focuses on using the capability of electrochemical sensor arrays to discretely activate and monitor the response of arrayed electrodes to a redox couple. The Au electrodes were arranged in a 2x5 configuration and activated separately at different potentials. The current levels associated with redox events for ferrocyanide in aqueous solution were measured. The redox couple was also used to assess the electrode impedance by varying polarization potentials and applied frequencies. Both the potentiometric and impedometric methods of operation led to determining the formal potential of ferrocyanide in approximately ten seconds. The ability to ascertain this important electrochemical characteristic in mere seconds is an essential first step in developing an algorithm for a fast and responsive sensor system.