Fabrication of Electrochemically Reduced Graphene Oxide Films on Glassy Carbon Electrode by Self-Assembly Method and Their Electrocatalytic Application

Abstract

We report a simple, facile, and reproducible method for the fabrication of electrochemically reduced graphene oxide (ERGO) films on glassy carbon electrode (GCE) by the self-assembly method. The graphene precursor, graphene oxide (GO), was self-assembled on GCE through a diamine linker which was preassembled on GCE by electrostatic interaction between the positively charged amine and the negatively charged layers of graphene oxide (GO). The oxygen functional groups present on the surface of GO were electrochemically reduced to retain the aromatic backbone of graphene. The attachment of GO followed by its electrochemical reduction was confirmed by ATR-FT-IR spectroscopy, Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM). Raman spectra show that the intensity ratio of D and G bands was increased after the electrochemical reduction of GO. XPS results reveal that the carbon-to-oxygen ratio was increased after the electrochemical reduction of electrostatically assembled GO. Further, Raman and XPS results confirm the removal of oxygen functional groups present on the surface of GO after electrochemical reduction. Impedance spectral studies show that the electron transfer reaction was facile at ERGO modified GCE. Finally, the electrocatalytic activity of ERGO was examined by studying the oxidations of ascorbic acid (AA), dopamine (DA), and uric acid (UA). It enhanced the oxidation currents of AA, DA, and UA when compared to bare GCE. The electrocatalytic activity of the present modified electrode was highly stable.

In situ surface electrochemical co-reduction route towards controllable construction of AuNPs/ERGO electrochemical sensing platform for simultaneous determination of BHA and TBHQ

“…In the second cycle, the reductive peak decreases considerably and disappeared after several potential scans, demonstrating that the GO could be reduced electrochemically at negative potentials and the reduction of surface-oxygenated species at GO occurred irreversibly and quickly [26]. The following mechanism for the electrochemical reduction of GO have been proposed by M. Amal Raj and S. Abraham John [28]:…”

X-Ray Photoelectron Spectroscopic Characterization of Chemically Modified Electrodes Used as Chemical Sensors and Biosensors: A Review

“…Raj and John reported the fabrication of ERGO films on glassy carbon electrode by a self-assembly method [42]. GCEs were immersed into a solution of 1,6-hexanediamine (HDA).…”

“…Preparation and characterization of the CME were described in a previous paper [42]. As in that paper, XPS measurements were performed by using ITO as a substrate in place of GC.…”

Electrosensing Platform for Varenicline Based on Reduced Graphene Oxide

“…In recent years, reduced graphene oxide (rGO) has become one of the most intensively explored carbon allotropes in electrosensing and electrocatalytic applications [1][2][3][4]. It also represents a promising material for the construction of electrochemical sensors for analytical applications due to its ability to promote electron transfer when used as an electrode material.…”