Synthesis of polypyrrole coated manganese nanowires and their application in hydrogen peroxide detection

摘要

This study focuses on the synthesis and application of polypyrrole coated manganese nanowires (Mn/PPy NWs) as an enzyme-less sensor for the detection of hydrogen peroxide (H_2O_2). The X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) results confirm a core-shell structure with the Mn nanowires encapsulated by the PPy. An electrochemical sensor based on the Mn/PPy NWs for amperometric determination of H_2O_2 is prepared. The electrochemical behaviour of H_2O_2 is investigated by cyclic voltammetry with the use of modified glassy carbon electrode (GCE) with Mn/PPy NWs film. The modified glassy carbon electrode (GCE) with Mn/PPy NWs shows enhanced amperometric response for the detection of H_2O_2. This is due to the high available surface area of Mn/PPy NWs which can provide a suitable area for the reaction of H_2O_2. The detection limit and limit of quantification (S/N = 3) for two linear segments (low and high concentration of H_2O_2) are estimated to be 2.12 μmol L~(-1), 7.07 nmol L~(-1) and 22.3 μmol L~(-1), 74.5 μmol L~(-1), respectively. In addition, the sensitivity for these two linear segments is 0.4762 μA mM~(-1) and 0.0452 μA mM~(-1) respectively.