An Electrochemical Study of Two Self-Dopable Water-Soluble Aniline Derivatives: Electrochemical Deposition of Copolymers

Abstract

An electrochemical study of two water-soluble aniline derivatives, N-(3-sulfopropyl) aniline (AnPS) and N-(3-sulfopropyl) p-aminodiphenylamine (DAnPS), in aqueous acidic electrolytic solutions containing different kinds of doping anions (Cl −, SO4 2−, and ClO4 −) was carried out. At sufficiently high anodic potential, the sulfonated aniline derivatives undergo oxidation processes yielding cation-radical and dimer intermediates, but no polymer deposition was observed on the working electrode surface. Experimental results showed that both aniline derivatives are electroactive compounds exhibiting redox behaviour in the range of potential of −0.2 V–1.6 V. Due to the self-doping effect induced by sulfonic groups, AnPS and DAnPS compounds have good electroactivity even in neat water solution. By adding a small amount of aniline into electrolytic system, thin layers of copolymers were deposited on the working electrode surface. The copolymer layers formed on the electrodes show a highly orientational and positional order, confirmed by AFM and XRD spectroscopic techniques. During the anodic oxidation processes some distinct colour changes were observed.

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

“…other forms of aniline that are less conductive). During the oxidation process, the aniline monomer еxhibits an electrochromic behaviour, being yеllow at low potential value and passing through grеen and blue to black at higher potentials [39][40][41] .…”

Double benefit of electrochemical techniques: Treatment and electroanalysis for remediation of water polluted with organic compounds

“…It can be noticed that the first oxidation-reduction couple was reversible (peaks 1 and 3), and this is confirmed by a peak-to-peak separation E of 59 mV and ipa/ipc ratio of 0.998. Then, even though the substituents could block a chemical coupling reaction, this chemical reaction was involved in the global electrochemical process (ECE mechanism) of Mesidine [26][27][28]. To further analyze this process, once 20 cycles of 200 ppm of Mesidine were recorded (Fig.…”

Self‐doped N‐propansulfonic acid polyaniline‐polyethylene terephthalate film used as active sensor element for humidity or gas detection

“…An important trend is the development of devices and sensors based on flexible substrates. The most used substrate to detect the sensors properties is ITO, but as it is brittle, it can be easily degraded and lose the conductivity and the sensing character . Other substrates used for depositing the polymer for applications of gas detection and humidity sensors are thermal plastics materials, ceramics, or silicon .…”

“…The most used substrate to detect the sensors properties is ITO, but as it is brittle, it can be easily degraded and lose the conductivity and the sensing character. 4,48 Other substrates used for depositing the polymer for applications of gas detection and humidity sensors are thermal plastics materials, ceramics, or silicon. 49 The combination of PANi and various inorganic metals or metal oxides has resulted in materials with synergistic properties that make use of the catalytic effect of the metal or metal oxide and has developed new gas and humidity sensors.…”