Hydrothermal synthesis and magnetic properties of {alpha}-MnO{sub 2} nanowires

Highlights: Black-Right-Pointing-Pointer {alpha}-MnO{sub 2} nanowires were synthesized through the hydrothermal method. Black-Right-Pointing-Pointer Ferromagnetism was observed in the {alpha}-MnO{sub 2} nanowires at 5 K. Black-Right-Pointing-Pointer The N{sub 2} adsorption-desorption experiment show...

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Published inMaterials research bulletin Vol. 47; no. 3
Main Authors Zhao, J.G., School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, Huai'an 223300, Yin, J.Z., School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an 223300, Yang, S.G.
Format Journal Article
LanguageEnglish
Published United States 15.03.2012
Subjects
FERROMAGNETISM
HYDROTHERMAL SYNTHESIS
MAGNETIC PROPERTIES
MANGANESE OXIDES
MATERIALS SCIENCE
NANOSCIENCE AND NANOTECHNOLOGY
PARAMAGNETISM
QUANTUM WIRES
SCANNING ELECTRON MICROSCOPY
SQUID DEVICES
SURFACE AREA
X-RAY DIFFRACTION
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Summary:Highlights: Black-Right-Pointing-Pointer {alpha}-MnO{sub 2} nanowires were synthesized through the hydrothermal method. Black-Right-Pointing-Pointer Ferromagnetism was observed in the {alpha}-MnO{sub 2} nanowires at 5 K. Black-Right-Pointing-Pointer The N{sub 2} adsorption-desorption experiment shows that surface area of {alpha}-MnO{sub 2} nanowires is 160.4 m{sup 2} g{sup -1}. -- Abstract: In the present study, one-dimensional (1D) {alpha}-MnO{sub 2} nanowires with width of 50-60 nm, length about several micrometers have been successfully prepared under hydrothermal conditions in the presence of sodium carboxymethyl cellulose. The samples were characterized by X-ray diffraction, scanning electron microscope, superconducting quantum interference device and N{sub 2} adsorption-desorption experiment. The magnetic measurement reveals that the {alpha}-MnO{sub 2} nanowires exhibit a ferromagnetic behavior at 5 K and a paramagnetic behavior at 300 K. The N{sub 2} adsorption-desorption experiment shows that surface area is 160.4 m{sup 2} g{sup -1}, which is even larger than those of mesoporous nanostructures. At the same time, the possible formation mechanism for the formation of {alpha}-MnO{sub 2} nanowires has been proposed according to the experimental results.
ISSN:0025-5408
1873-4227
DOI:10.1016/J.MATERRESBULL.2011.11.023