Electrochemical Synthesis of Three-Dimensional Polyaniline Network on 3-Aminobenzenesulfonic Acid Functionalized Glassy Carbon Electrode and Its Application

Abstract

The electrochemical synthesis of three-dimensional (3D) polyaniline (PAN) network structure on 3-aminobenzenesulfonic acid (ABSA) functionalized glassy carbon electrode (GCE) and its electro-catalytic oxidation towards ascorbic acid (AA) had been studied. ABSA was first covalently grafted on GCE surface via the direct electrochemical oxidation of ABSA on GCE, which was followed by the electrochemical polymerization of aniline on the ABSA functionalized GCE. Then PAN-ABSA composite film modified GCE (PAN-ABSA/GCE) was obtained. Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and electrochemical techniques had been employed to characterize the obtained electrodes. Due to the effective doping of ABSA in PAN, the redox electro-activity of PAN had been extended to neutral and even the basic media, thus, the PAN-ABSA composite film modified GCE could be used for electro-catalytic oxidation of AA in 0.1 M phosphate buffer solution (PBS, pH 6.8). At PAN-ABSA/GCE the oxidation over-potential of AA shifted from 0.39 V at GCE to 0.17 V with a greatly enhanced current response. The electro-catalytic oxidation peak current of AA increased linearly with the increasing AA concentration over the range of 5.00 × 10 -4 -1.65 × 10 -2 M with a correlation coefficient of 0.9973. The detection limit (S/N = 3) for AA was 1.16 × 10 -6 M. Chronoamperometry had also been employed to investigate the electro-catalytic oxidation of AA at PAN-ABSA/GCE. The modified electrode had been used for detecting AA in real samples with satisfactory results.

Insight into the template effect of vesicles on the laccase-catalyzed oligomerization of N-phenyl-1,4-phenylenediamine from Raman spectroscopy and cyclic voltammetry measurements

“…The redox activity of poly(PADPA) obtained in the presence of AOT vesicles was preserved even at pH = 6.00, ( Fig. 6c,f ) which is a rather important finding because, usually, PANI loses its electro-activity at pH > 5 46 . For poly(PADPA) synthesized in the template-free system, the redox activity was lost already at pH = 3.04 ( Fig.…”

“…At pH = 1.14, the cyclic voltammogram of poly(PADPA)-AOT products is very similar to the cyclic voltammograms of conductive ‘standard’ PANIs, thus supporting the results of Raman spectroscopy regarding the positive template effect of AOT vesicles on the formation of conductive PANI-ES-like poly(PADPA) products. In addition, the redox activity of poly(PADPA) produced with vesicles is preserved at higher pH values, up to the upper limit of the investigated pH range of pH = 6.00, unlike conventional PANI-ES which completely loses its redox activity at pH > 5 46 or even 4 54 and unlike poly(PADPA) produced without vesicles which loses its redox activity already at pH = 3.0.…”

Investigation of Electrochemical Performance of PmAP/WO3 Composite

“…Before doing CV measurement, nitrogen gas (for 10 min) is purged to remove oxygen from solution and maintained inert environment (i.e., N2 atmosphere is maintained). Working electrode i.e., glassy carbon electrode (GCE) has electrocapacitive power towards the redox substances [27][28][29][30]. Therefore, GCE is regularly pretreated with HClO4 acid.…”

Anew Synthetic Polymers Based on Polyaniline for Dual-Functional Applications: Photoelectrochemical Water Splitting and Antibacterial Activities

“…The agar diffusion technique was used to describe the antimicrobial activity of the polymer samples . Polymer samples were tested against Gram-positive bacteria (B.…”

“…The agar diffusion technique was used to describe the antimicrobial activity of the polymer samples. 32 Polymer samples were tested against Gram-positive bacteria (B. subtilis ATCC 6633 and S. aureus ATCC 35556), Gram-negative bacteria (E. coli ATCC 23282 and P. aeruginosa ATCC 10145), yeast (Candida white IMRU 3669), and filamentous fungi (A. niger ATCC 16404). Bacteria and yeast grow on nutrient agar, while fungi grow on Czapek's Dox agar medium.…”