MnO2/PANI/rGO–A Modified Carbon Electrode Based Electrochemical Sensor to Detect Organophosphate Pesticide in Real Food Samples

In the present study, a selective and sensitive MnO2/PANI/rGO nanocomposite based electrochemical sensor for the effective finding of methyl parathion (MP) is reported. MnO2/PANI/rGO (where PANI=polyaniline, rGO=reduced graphene oxide) nanocomposite was synthesized through a one-pot chemical polymerization technique and characterized by FTIR, XRD, Raman, HR-TEM, electrochemical (Differential Pulse Voltammetry, cyclic voltammetry amperometry) and impedance techniques. From the results, the excellent electrocatalytic ability of modified MnO2/PANI/rGO nanocomposite film was recognized through the electrode delivery in the reduction process of methyl parathion. Astonishingly, the newly developed sensor showed a compassion of 3.05 μA μM-1 cm-2 with a limit of detection (LOD) 7.4 nM. The high electrocatalytic ability of MnO2, the excellent physicochemical properties of rGO along with large surface area and high conductivity of PANI have contributed much to the exceptional sensing property of the modified electrode. Most prominently, the method of detection is successfully verified in apple, milk and water which proved its potential in real-time applicability for fruit juice and beverages.