Effects of The Synthesis Temperature on Electrical Properties of Polyaniline and their Electrochemical Characteristics onto Silver Cavity Microelectrode Ag/C-EM

Abstract

In this work, the synthesis of a conductive polymer which is polyaniline (PANI) was realized by chemical oxidation of monomer in three different temperatures (5, 30 and 60 °C) to obtain a powder with the best possible electrical conductivity.Electrochemical stability and oxydo-reduction mechanism of the polyaniline synthesized, was studied by cyclic voltammograms with sweeping potential on the polyaniline which presents the best specific conductivity. This study was made by means of a new generation of electrode noted silver cavity microelectrode (Ag/C-EM), developed at the level of electrochemistry catalysis and organic synthesis laboratory (LECSO) of Paris XII university. The using of (Ag/C-EM) was employed to prevent the leaching problems and improve the study of the stability by voltammograms of PANI synthesized by chemical oxidation. The electrical characterization of the three polymers synthesized showed that the best specific conductivity was obtained with the polymer synthesized in the lowest temperature (5 °C). Evolution of intensities, potential of anodic peaks surfaces of the PANI at (Ag/C-EM) with the speeds of sweeping showed that the oxydo-reduction process of PANI is reversible, semi fast, quantitative and stable on all the studied domain of speed. Electrochemical stability of the PANI at (Ag/C-EM) is revealing by the constant shape of voltammograms after 50 cycles of sweeping in acid middle.