Fabrication of platinum-doped NiCo2O4 nanograss modified electrode for determination of carbendazim.

ABSTRACT

In this study, a platinum-doped nickel cobaltite nanograss (Pt-doped NiCo2O4 NG) with its own unique structural features was initially synthesized, utilizing a simple hydrothermal method and then applied as a novel platform for the detection of carbendazim (C9H9N3O2; CBZ). To this end, the CBZ electrochemical signals were evaluated by means of differential pulse voltammetry (DPV), demonstrating the acceptable catalytic effect of the Pt-doped NiCo2O4 NG/screen-printed electrode (SPE) on the CBZ oxidation signal. Under the optimized conditions, CBZ was subsequently quantified by the Pt-doped NiCo2O4 NG/SPE with a wide linear range (0.03-140 µM) and a low limit of detection (LOD) value (0.005 µM). The proposed sensor was thus characterized by good anti-interference ability, selectivity, and stability. The analysis of the real samples, viz. tomato and lettuce, also confirmed that the given sensor had good recoveries and relative standard deviation (RSD). Ultimately, a comparison between liquid chromatography-mass spectrometry (LC-MS) and this method established no significant difference in the results.