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  • Know Res., 2015, 2(2),  pp 71-76  

    DOI:10.7598/kor2015.154

    Research Article

    Crystal Structure Refinement and Electrical Transport Properties of α-MnO2 Nanorods

  • REENU ELIZABETH JOHN1, ANOOP CHANDRAN1, M. MANUJA1, AJAY JOSE1, GIJO JOSE1, MARYKUTTY THOMAS2 and K C GEORGE1
  • 1Department of Physics, St. Berchmans College, Changanassery, Kerala- 686101, India
    2Department of Physics, BCM College, Kottayam, Kerala- 686001, India
  • Abstract

    Manganese dioxide (MnO2) has various applications ranging from catalysts and batteries to energy efficient devices and carbon storage applications. In this work, α MnO2 nanorods were synthesized using a low temperature chemical method. The XRD pattern confirms the formation of cryptomelane MnO2 with average crystallite size 14 nm. The HR-TEM studies have revealed that nanorods have average radius of 17 nm and length of 377 nm. Crystal structure was analysed using Rietveld refinement. Studies on the transport properties of MnO2 nanostructures can give vital information about the charge carrier mobility of the material. The EDS spectrum has affirmed the presence of Mn, O and K in cryptomelane MnO2. The dc electrical transport in MnO2 nanorods was studied and the electrical conductivity was found to arises due to thermal activation of charge carriers obeying the Arrhenius law at high temperatures.

    Keywords

    α-MnO2, Rietveld refinement, Arrhenius law

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