PREPARATION OF POLYPYRROLE POLYTHIOPHENE DOUBLE-LAYERS BY ELECTROCHEMICAL POLYMERIZATION OF PYRROLE IN THE PRESENCE OF THIOPHENE

Studies on electrochemical polymerization of pyrrole in the presence o f thiophene are given for preparation of polypyrrole (PPy)/polythiophe ne (PTh) double layers. At a constant current, only pyrrole is electro chemically polymerized in the electrolytic solution containing pyrrole and thiophene in the present experiments. The cyclic voltammograms on pyrrole/ thiophene mixtures are similar to that on pyrrole. Preparati on of PPy/PTh double layers is carried out by electrochemical polymeri zation of pyrrole in the presence of thiophene by adding pyrrole and b y lowering voltage immediately after electrochemical homopolymerizatio n of thiophene. The resulting double layers show good rectification ch aracters dependent on thickness. (C) 1995 John Wiley and Sons, Inc.