Green and large-scale one-pot synthesis of small-sized graphene-bridged manganese dioxide nanowire network as new electrode material for electrochemical sensing

The cross-linked MnO 2 nanowire (MNWS) network bridged with small-sized graphene (SSGS) with a uniform size of ~200 nm is prepared by a one-pot green hydrothermal route from graphene oxide sol and KMnO 4 . The route causes KMnO 4 to react and form MnO x through both self-decomposition and etching graphene, as a result that MnO x grow into nanowires and micrometer-scale graphene is cut into SSGS simultaneously. The as-prepared MNWS/SSGS is characterized by scanning electron microscope, transmission electron microscope and X-ray diffractometer. The electrocatalytic activity of MNWS/SSGS for H 2 O 2 reduction is studied by means of cyclic voltammetry and chronoamperometry. The MNWS/SSGS modified glassy carbon electrode exhibits a sensitive and prompt amperometric response to H 2 O 2 , with a sensitivity of 56 μA mM −1 and detection limit as low as 0.54 μM. These outstanding performances demonstrate that MNWS/SSGS is promising for fabrication of electrochemical sensors. Importantly, this study may offer a novel and insightful approach for the preparation and development of advanced materials based on the bridging architecture. Graphical Abstract