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Promotion Effects of CNTs-MnO2 Nanowires-composite on Direct Electron Transfer of Hemoglobin for Amperometric H2O2 Determination

MnO 2 nanomaterials with controlled morphologies were synthesized by different methods and characterized by SEM, XRD. The promotion ability of as-prepared MnO 2 nanomaterials towards the direct electron transfer (DET) of hemoglobin has been studied. It is found that promotion effect of carbon nanotubes (CNTs) and MnO 2 nanowires nanocomposite can be observed for the DET of hemoglobin. In the optimum conditions, the symmetrical redox peak can be observed with peak separation of 58 mV and formal potential of -0.339 V, respecting the direct electron transfer of hemoglobin on this composite film. The rate constant has also been estimated to be 1.10 s -1 . The proposed biosensor has favorable reproducibility, stability and sensitivity, and has been used to amperometric determination of hydrogen peroxide with detection limit of 2.4×10 -8 mol/L, and the Michealis-Menten constant can also be estimated to be 0.32 mmol/L.