Screen-printed graphite electrode modified with Co₃O₄ nanoparticles and 2D graphitic carbon nitride as an effective electrochemical sensor for 4-aminophenol detection

Abstract

We fabricated a new electrochemical 4-aminophenol sensor based on a nanocomposite of Co3O4 nanoparticles and graphite carbon nitride (Co3O4@g-C3N4), used for the modification of screen-printed electrode (Co3O4@g-C3N4/SPE). The synthesized nanocomposite was characterized using field-emission scanning electron microscopy (FE-SEM), energy-dispersive x-ray spectroscopy (EDX), x-ray diffraction (XRD) and Fourier transform-infrared (FT-IR) techniques. The electro-oxidation of 4-aminophenol in phosphate buffer solution (pH=7) was investigated via cyclic voltammetry, differential pulse voltammetry and chronoamperometry. The peak current of oxidation in the optimized conditions had linear relationship with various 4-aminophenol contents (0.05 to 780.0 µM) with the correlation coefficient of 0.9996 and the limit of detection (S/N= 3) of 1.5 × 10−8 M. The developed method was successful to determine 4-aminophenol in real specimens, with acceptable outcomes.

CuO nanorod-decorated hemin-graphene with enhanced peroxidase-mimicking performance for the colorimetric and electrochemical determination of 4-aminophenol with a smartphone

“…Compared with the previous methods, the dualmode method has a wider linear range and comparable LOD as shown in Table S1. † 6,12,[38][39][40][41][42][43][44][45][46]…”

Fe3O4/GO nanocomposite modified glassy carbon electrode as a novel voltammetric sensor for determination of bisphenol A

“…However, the response signal of conventional sensors toward analytes detection is quite weak, making it very difficult to achieve accurate measurements of analytes. Therefore, in order to improve the response signal of the analyte determination, electrochemical sensors are modified with various materials [35][36][37][38][39][40][41][42][43][44][45][46][47].…”