A NEW KIND OF REDOX SENSOR BASED ON CONDUCTING POLYMER-FILMS

A new type of redox electrode based on a conducting organic polymer, which responds to a change of monomer concentration, is described. Sensors based on polypyrrole, polyaniline and a copolymer of aniline and para aminophenol have been prepared, with responses to pyrrole, aromatic amines and substituted phenols, respectively. A kinetic description using Nikolsky's equation is given for redox processes like 'polymer-monomer'; the conditions of its applicability are discussed. The results indicate that for such sensors a correlation exists between the selectivity and the parameters of the redox processes.