Electrochemical doping of tetraethylammonium on C/sub 60/ film

Abstract

Summary form only given. Thin films of the fullerene C/sub 60/, formed by solution casting, were studied by cyclic voltammetry (CV) in acetonitrile (MeCN) solutions containing quaternary ammonium salts as supporting electrolytes in 0.1V to -1.3V range. The film shows one CV reduction wave on the first scan to negative potential with broad cathodic potential (Ep) of - 1.10V vs Ag/AgCl. On the successive reverse scan to positive potentials, the film shows three CV oxidation waves with anodic peak potentials (Epa) of -0.78(O1), -0.52(O2), and -0.35(O3)V vs, Ag/AgCl. The film shows four CV reduction waves on an second scan to negative potentials with cathodic peak potentials of -0.69(R1), -0.76(R2), -0.92(R3), and -1.05(R4)V vs Ag/AgCl. On the successive reverse scan to positive potentials, the film shows three CV oxidation waves with anodic peak potentials same as the first scan. The CV behavior for the reduction process indicates a large structural reorganization of the film with intercalation of the supporting electrolyte cation and a small amount of dissolution. The size of the cations affects the nature of these CV waves. The CV behavior of the chemically (or physically) modified C/sub 60/ film have been examined to explain the doping of the film by cation.