NEW MATERIALS FOR ELECTROCHEMICAL SENSING .1. RIGID CONDUCTING COMPOSITES

The development of composites based on conductive phases dispersed in polymeric matrices has led to important advances in analytical electro chemistry, particularly in sensor devices. These new materials combine the electrical properties of graphite with the ease of processing of plastics (epoxy, methacrylate, Teflon, etc.) and shaw attractive elect rochemical, physical, mechanical and economical features compared to t he classic conductors (gold, platinum, graphite, etc.). The properties of these composites are described, along with their application to th e construction of conductometric, potentiometric and amperometric sens ors. The chemical modification of the composites by blending fillers t hat improve the analytical characteristics of the resulting sensors is discussed, particularly for the case of amperometric devices.