Electrodeposition of self-doped copolymers of aniline with aminobenzensulfonic acids on stainless steel. Morphological and electrochemical characterization

Abstract

Self-doped conducting polyaniline (PAn) films were deposited on passive stainless steel (SS) AISI304 substrates by cyclic potential sweep deposition from aqueous mixed monomer solutions of aniline (An) and different aminobenzenesulfonic acids (2-, 3-or, 4-aminobenzenesulfonic acid, ABSA), without the presence of a supporting electrolyte. Two different An concentrations were examined (0.01 and 0.05 M), while the concentration of each ABSA used was kept constant at 0.

Electrochemically Generated Recognition Sites in Self‐doped Polyaniline Modified Electrodes for Voltammetric and Potentiometric Determination of Copper(II) Ion

“…The weaker intensity of stripping signal at more negative potentials can be ascribed to the less conductivity of polyaniline along with the interruption of accumulation process by hydrogen evolution . The smaller stripping signal at more positive potentials may be due to the less reduction of copper ions and oxidation and eventually degradation of polyaniline . Cu(II) ions tend to form chelates with nitrogen, oxygen and sulfur atoms in the P(An‐co‐MA) membrane.…”

“…The P(An‐co‐MA) membrane was prepared using the potentiostatic method at a potential of +0.75 V. The aqueous growth solution consisted of 0.30 M of MA and 0.15 M of An without any additional supporting electrolyte. Such polymerization method and ratio of comonomers concentrations have been reported previously. It has been reported that preparation of conducting polymers without the presence of a supporting electrolyte, yield a polymer with more reproducible and well‐defined characteristics .…”

“…The different aspects of the templated membrane in comparison with the untemplated membrane (Figure a) can be ascribed to the following phenomena; first, through reductive steps of the templating program, the embedded copper ions are reduced and form active sites for further inclusion of copper species. Dissolving of copper clusters in the positive steps of the templating process, results in the formation of pores in the membrane; second, since dimers and oligomers are more oxidizable than the monomer , through positive steps of the templating process, monomers and oligomers that after electropolymerization stay in the membrane, are electropolymerized. This extra‐polymerization process increases the extent of conjugation of the polymeric film and changes the morphology of the P(An‐co‐MA) coating.…”

“…This CV consisted of a broad anodic peak at the potential of about 0.41 V and two cathodic peaks at potentials of about 0.39 and 0.14 V. The anodic peak comprises leucoemeraldine/emeraldine, and emeraldine/pernigraniline redox transitions. These features of P(An‐co‐MA) film is in conformance with the results of the preceding researches . There was no appreciable change in the voltammograms in consecutive scans, which is an evidence for high stability of the P(An‐co‐MA) film.…”

Electrochemical Sensor Based on Self-doped Polyaniline with Guest-induced Binding Sites for Detection of Lead(II) Ion

“…P(Ani-co-3ABSA) coating was potentiostatically synthesized at a potential of 750 mV in an growth solution which solely composed of 0.15 M Ani and 0.30 M 3ABSA. Similar polymerization procedure [26] and concentration ratio of comonomers [27] have been used formerly. It has been recognized that synthesis of a conductive polymer in the absence of any supporting electrolyte produces a polymer coating with more favorable electrochemical properties [28].…”