Screen-printed Graphite Electrode Modified with Co3O4Nanoparticles and 2D Graphitic Carbon Nitride as an Effective Electrochemical Sensor for 4-Aminophenol Detection

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 × 10-8M. The developed method was successful to determine 4-aminophenol in real specimens, with acceptable outcomes.