ELECTROCHEMICAL CONSTRUCTION OF ULTRATHIN-FILM COMPOSED OF QUASI-2-DIMENSIONAL PORPHYRIN POLYMERS

Construction of an ultrathin film composed of porphyrin polymer with q uasi two-dimensional (2D) structure on a facet of a gold single crysta l as the substrate was attempted by the electrochemical polymerization of zinc tetrakis(oligothienyl) porphyrin. In order to produce uniform thin film the polymerization was performed under the adsorption equil ibrium by sweeping the potential, and the total electric charge suppli ed in the polymerization was controlled toward the formation of the mo nolayer of porphyrin polymer. We also investigated (i) change in the s urface structure of the gold crystal substrate under the influence of the applied potential and (ii) morphologies of the polymers depending on the molecular structures of the monomers. (C) 1998 Elsevier Science S.A. All rights reserved.