A new voltammetry sensor platform for eriocitrin based on CoS2-MoS2-PDDA-GR nanocomposite.

A novel electrochemically activated nanocomposite, CoS2 Nanoparticles and MoS2 Nanosheets decorated poly(diallyldimethylammonium chloride)-functionalized graphene (CoS2-MoS2-PDDA-GR), was successfully synthesized through a simple and low-cost method. X-ray diffraction (XRD), Transmission electron microscopy (TEM), Electrochemical impedance spectroscopy (EIS) and Cyclic voltammetry (CV) techniques were used to characterize the nanocomposites. Based on the CoS2-MoS2-PDDA-GR nanocomposite modified glassy carbon electrode, the electrochemical properties of eriocitrin were investigated in detail and a sensitive determinative method was established synchronously. Compared with others, this sensor exhibited larger effective surface area, more reactive site and excellent voltammetric response for eriocitrin. Under optimum conditions by DPV, the oxidation peak currents responded to eriocitrin linearly over a concentration range from 2.0 × 10-9 to 1.0 × 10-6 mol L-1 with a detection limit of 6.7 × 10-10 mol L-1 (S/N = 3). In addition, this fabricated sensor was successfully applied to detect eriocitrin in real samples with satisfactory results.