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

Published online by Cambridge University Press:  07 June 2011

Yaqoob Khan ,
Shahid Khan Durrani ,
Mazhar Mehmood  and
Muhammad Riaz Khan
Yaqoob Khan*
Affiliation:
National Centre for Nanotechnology, Department of Chemical and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan
Shahid Khan Durrani
Affiliation:
Materials Division, Pakistan Institute of Nuclear Science and Technology, Islamabad 45650, Pakistan
Mazhar Mehmood
Affiliation:
National Centre for Nanotechnology, Department of Chemical and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan
Muhammad Riaz Khan
Affiliation:
Centralized Resource Laboratory, University of Peshawar, Peshawar 25000, Pakistan
*
a)Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

Chemical synthesisHydrothermalNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 17: Focus Issue: Nanowires: Fundamentals and Applications , 14 September 2011 , pp. 2268 - 2275
Copyright
Copyright © Materials Research Society 2011

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