Electropolymerization of aniline monomer and effects of synthesis conditions on the characteristics of synthesized polyaniline thin films

Abstract

<jats:p>Electrochemical polymerization of aniline was carried on platinum (Pt) wire electrode in sulfuric acid (H2SO4) solution by cyclic voltammetry using a conventional three-electrode cell at room temperature (20°C). The effects on the electrodeposition of the monomer concentration, anodic potential and potential scan rate are discussed. The conductive layer of emeraldine base polyaniline (Pani) was prepared in this work by repeating potential cycling between -0.24 and 0.9 V/SCE at 50 mV/s in 1 M H2SO4 solution containing 0.1 M aniline monomer.</jats:p>

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“…The reduction peaks can be seen on the return scan at roughly 0.3 and 0.8 V, which was related to the reduction of the aniline produced during its oxidation as shown in Figure 3A. As the reduction polymerization proceeds, peak at 0.3 V corresponds to the reduction of emeraldine to leucoemeraldine, while the peak at 0.8 V corresponds to the reduction of pernigraniline to emeraldine 29–31 …”

“…The π–π* bonding band has a long‐range order with a polymer chain, resulting in small, high binding energy tails (BE = 287.9 eV). As a result, the spectrum characteristics are similar to those observed in the protonated form of PANI 25,31 …”

“…As a result, the spectrum characteristics are similar to those observed in the protonated form of PANI. 25,31 The N 1s high-resolution spectrum of PANI is shown in Figure 7D. It resolved into four peaks at 398.03, 399.18, 400.33, and 401.3 eV, respectively, associated with quinoid imine, benzenoid imine, positively charged imine, and protonated amine.…”

“…Figure 3A. As the reduction polymerization proceeds, peak at 0.3 V corresponds to the reduction of emeraldine to leucoemeraldine, while the peak at 0.8 V corresponds to the reduction of pernigraniline to emeraldine [29][30][31]. …”

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“…The galvanostatic technique is the synthesis of electroconductive polymers under constant current density conditions. The polymer film obtained at the end of the polymerization is in a doped, i.e., conductive form [13][14][15]. The potentiostatic polymerization and potentiodynamic polymerization techniques use a constant positive potential and cyclic voltammetry, respectively.…”