Abstract
A high dispersed nanofiber cryptomelane-type manganese dioxide was synthesized by a facile hydrothermal reduction route.The morphological characterization was examined by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The structure and electrochemical properties of the synthesized manganese dioxide were characterized by X-ray diffraction(XRD),Brunauer-Emmett-Teller(BET)surface area analyses,and an electrochemical workstation(EW).A glassy carbon electrode(GCE)modified with the nanostructured cryptomelane-type manganese dioxide was investigated for amperometric detection of hydrogen peroxide(H 2 O 2 )in phosphate buffer solution with a pH 7.4 at an open circuit potential of 0.2 V.The oxidation peak current was found to increase by 1.3μA with the addition of 0.1 mmol·L -1 H 2 O 2 based on a MnO 2 nanofiber-gelatin/GCE electrode.The amperometric signals are linearly proportional to the H 2 O 2 concentration in the range 0.1-1.5 mmo·lL -1 with a correlation coefficient of 0.996 using the GCE modified with 0.1%(w,mass fraction)cryptomelane-type manganese oxides.The sensor is sensitive and its significant electrocatalytic activity results from the nanostructure of the cryptomelane-type manganese oxides.In addition,the sensor has a good reproducibility,a low detection limit,simplicity,and a low cost of construction.These results demonstrate that this material with high electrocatalytic activity offers great promise as a new class of nanostructured electrodes for biosensors.
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