Synthesis of polypyrrole coated manganese nanowires and their application in hydrogen peroxide detection (original) (raw)

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 2 O 2 ). The X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) results confirm a coreeshell structure with the Mn nanowires encapsulated by the PPy. An electrochemical sensor based on the Mn/PPy NWs for amperometric determination of H 2 O 2 is prepared. The electrochemical behaviour of H 2 O 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 2 O 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 2 O 2 . The detection limit and limit of quantification (S/N ¼ 3) for two linear segments (low and high concentration of H 2 O 2 ) are estimated to be 2.12 mmol L À1 , 7.07 mmol L À1 and 22.3 mmol L À1 , 74.5 mmol L À1 , respectively. In addition, the sensitivity for these two linear segments is 0.4762 mA mM À1 and 0.0452 mA mM À1 respectively.