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

This work focussed on the fabrication of synergetic spinel CoMn 2 O 4 embedded reduced graphene oxide (CoMn 2 O 4 @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 electrolyte. The CoMn 2 O 4 @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 CoMn 2 O 4 @RGO modified SPCE. The present electrochemical sensor shows a dynamic linear response range from 0.01 to 137.65 µM and the detection limit, quantification, sensitivity were estimated to be 0.050 µM, 1.64 µM, and 3.77 µA µM −1 cm −2 . Furthermore, the proposed MTL sensor was exhibited numerous 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 proposed. 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.