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Mild hydrothermal synthesis of γ-MnO2 nanostructures and their phase transformation to α-MnO2 nanowires

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Abstract

Urchin-like γ-MnO2 nanostructures, composed of nanowires with diameters in the range 40–70 nm were prepared through the direct reaction between MnSO4 and KClO3 via a mild hydrothermal route. Reaction time and temperature were found to influence both the phase and morphology of as-prepared products. For longer reaction times, the initially formed γ-phase transformed to α-MnO2 nanowires along with the loss of urchin-like morphology. Powder x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetry and differential scanning calorimetry were used to characterize the as-prepared products. On the basis of XRD patterns and SEM images, a possible growth mechanism for the time-dependant morphological evolution of various MnO2 nanostructures has been suggested and discussed.

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Acknowledgment

The authors thank Central Diagnostic Laboratories (CDL), Pakistan Institute of Nuclear Science and Technology, for providing the TG-DSC facility. Financial support from the Higher Education Commission of Pakistan for Ph.D. fellowship (Y. Khan) is highly acknowledged.

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Authors and Affiliations

  1. National Centre for Nanotechnology, Department of Chemical and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad, 45650, Pakistan

    Yaqoob Khan & Muhammad Riaz Khan

  2. Materials Division, Pakistan Institute of Nuclear Science and Technology, Islamabad, 45650, Pakistan

    Shahid Khan Durrani

  3. Centralized Resource Laboratory, University of Peshawar, Peshawar, 25000, Pakistan

    Mazhar Mehmood

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  1. Yaqoob Khan
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  4. Muhammad Riaz Khan
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Correspondence to Yaqoob Khan.

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Khan, Y., Durrani, S.K., Mehmood, M. et al. Mild hydrothermal synthesis of γ-MnO2 nanostructures and their phase transformation to α-MnO2 nanowires. Journal of Materials Research 26, 2268–2275 (2011). https://doi.org/10.1557/jmr.2011.138

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