Synthesis of MnO2/MWNTs Nanocomposites Using a Sonochemical Method and Application for Hydrazine Detection

Authors

  • Meifang Wang,

    1. College of Chemistry and Materials Science, Anhui Key Laboratory of Chem-Biosensing, Anhui Normal University, Wuhu 241000, P. R. China
    2. Department of Chemistry, Wannan Medical College, Wuhu 241000, P. R. China
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  • Cong Wang,

    1. Department of Chemistry and Biology, Anhui Key Laboratory of Spin Electron and Nanomaterials (Cultivating Base), Suzhou College, Suzhou 234000, P. R. China
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  • Guangfeng Wang,

    1. College of Chemistry and Materials Science, Anhui Key Laboratory of Chem-Biosensing, Anhui Normal University, Wuhu 241000, P. R. China
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  • Wei Zhang,

    1. College of Chemistry and Materials Science, Anhui Key Laboratory of Chem-Biosensing, Anhui Normal University, Wuhu 241000, P. R. China
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  • Fang Bin

    1. College of Chemistry and Materials Science, Anhui Key Laboratory of Chem-Biosensing, Anhui Normal University, Wuhu 241000, P. R. China
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Abstract

A sonochemical method has been successfully used to synthesize MnO2/MWNTs nanocomposites. The structure and nature of the resulting MnO2/MWNTs composite were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray diffraction (EDX), X-ray photoelectron spectroscopy (XPS).The results show that the sonochemically synthesized MnO2 nanoparticles were homogeneously dispersed on the modified MWNT surfaces. The performance of the MnO2/MWNTs nanocomposites modified electrode was characterized using cyclic voltammetry (CV) and Nyquist plots. The electrode exhibits efficient electron transfer ability and high electrochemical response towards hydrazine. This may be attributed to the small particle size, high dispersion of MnO2 particles. The fabricated hydrazine sensor showed a wide linear range of 5.0×10−7–1.0×10−3 M with a response time less than 5 s and a detection limit of 0.2 μM. Taking the advantage of the unique properties of both MWNTs and MnO2, it would greatly broaden the applications of MWNTs and MnO2.

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