Spinel CoMn2O4 nano-/micro-spheres embedded RGO nanosheets modified disposable electrode for the highly sensitive electrochemical detection of metol

Abstract

This work focussed on the fabrication of synergetic spinel CoMn2O4 embedded reduced graphene oxide (CoMn2O4@RGO) nanocomposite over the surface of modified screen-printed carbon electrode (SPCE) for highly sensitive and enhanced electrochemical detection of metol (MTL) in 0.05 M phosphate buffer elec-trolyte. The CoMn2O4@RGO nanocomposite material was synthesized by sonochemical method and well-characterized using various spectral and analytical (XRD, TGA, Raman spectroscopic, FE-SEM, HR-TEM & EA) techniques. Cyclic and differential pulse voltammetry techniques were used for the detection of MTL at CoMn2O4@RGO modified SPCE. The present electrochemical sensor shows a dynamic linear response range from 0.01 to 137.65 mu M and the detection limit, quantification, sensitivity were estimated to be 0.050 mu M, 1.64 mu M, and 3.77 mu A mu M-1 cm(-2). Furthermore, the proposed MTL sensor was exhibited numer-ous advantages including very ease fabrication, high selectivity, stability, and reproducibility for the detection of MTL. Based on the obtained experimental data a plausible MTL redox mechanism was pro-posed. In addition, the present electrochemical sensor was applied in real sample analysis at the spiked samples (lake water samples + MTL) observed with good recovery results. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.