Glassy carbon electrode modified by Poly (m-aminobenzoic acid) /nano SiO2 film and electrical and electrochemical properties

Abstract

Poly(m-aminobenzoic acid) (m-ABA) film is deposited on glassy-carbon electrode (GCE) by electropolymerization in pH 7.0 phosphate buffer solutions (PBS).

The electrochemical behavior of polymer film obtained is characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) studies. In the present study, the effect of the scan rate on the current peak is investigated in the range of 50-200 mV/sec and, it is observed that the anodic and cathodic peak all increased with the solution pH until it reached 8 and then decreased until 11. In addition, a new electrode is developing by electrodeposition of SiO₂ nanoparticles on glassy-carbon electrode. The electrochemical behavior of polymer at the nanoparticles SiO₂/GCE is investigated. Electrical properties as a function of frequency and temperature have also indicated a great interaction between epoxy matrix and different poly (m-aminobenzoic acid) / SiO₂ by physical mixing procedure.