FABRICATION AND CHARACTERIZATION OF A PLATINUM CERAMIC ELECTROCHEMICAL SENSOR

An electrochemical sensor has been fabricated by screen printing platinum electrodes onto a ceramic base material. The sensor code consists of three electrodes: a platinum auxiliary electrode, a platinum working electrode and a reference electrode made by depositing silver and then silver chloride onto a third platinum electrode. The resulting sensor, when immersed in a solution of K3Fe(CN)6/KCl and examined by cyclic voltammetry, possesses electrochemical characteristics similar to those of a commercial platinum disk electrode. The operable potential window of the sensor at various pH values is suitable to observe the redox characteristics of many analytes of interest. The platinum/ceramic sensor is also applicable to solid-state electrochemical measurements when coated with an ionically conductive polymer such as poly(ethylene oxide) doped with LiCF3SO3.