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Unusual magnetic behavior of SiCN/multiwalled carbon nanotubes nanocomposites

Francis, A. and Riedel, R. (2009):
Unusual magnetic behavior of SiCN/multiwalled carbon nanotubes nanocomposites.
In: Journal of Applied Physics, 105 (7), AIP, pp. 07A318-1-07A318-3, ISSN 00218979,
[Online-Edition: http://dx.doi.org/10.1063/1.3062958],
[Article]

Abstract

Multiwalled carbon nanotubes (MWCNTs) have been dispersed homogeneously throughout a preceramic polysilazane matrix. The homogenized mixture was then warm pressed and subsequently pyrolyzed in Ar atmosphere at 1100 °C, yielding an amorphous silicon carbonitride (SiCN)/MWCNT nanocomposite. The hysteresis loop of the 5 vol % CNT/SiCN composite revealed a ferromagneticlike behavior up to 5000 Oe and a semiconductinglike feature at a higher applied field. The magnetic behavior of CNT-rich composites is due mainly to defects and to the interaction between the nanotubes and the SiCN matrix, which is indicated by a shift in the G and D bands of graphitic carbon as determined by Raman spectroscopy. © 2009 American Institute of Physics

Item Type: Article
Erschienen: 2009
Creators: Francis, A. and Riedel, R.
Title: Unusual magnetic behavior of SiCN/multiwalled carbon nanotubes nanocomposites
Language: English
Abstract:

Multiwalled carbon nanotubes (MWCNTs) have been dispersed homogeneously throughout a preceramic polysilazane matrix. The homogenized mixture was then warm pressed and subsequently pyrolyzed in Ar atmosphere at 1100 °C, yielding an amorphous silicon carbonitride (SiCN)/MWCNT nanocomposite. The hysteresis loop of the 5 vol % CNT/SiCN composite revealed a ferromagneticlike behavior up to 5000 Oe and a semiconductinglike feature at a higher applied field. The magnetic behavior of CNT-rich composites is due mainly to defects and to the interaction between the nanotubes and the SiCN matrix, which is indicated by a shift in the G and D bands of graphitic carbon as determined by Raman spectroscopy. © 2009 American Institute of Physics

Journal or Publication Title: Journal of Applied Physics
Volume: 105
Number: 7
Publisher: AIP
Uncontrolled Keywords: carbon nanotubes, diamagnetic materials, ferrimagnetic materials, magnetic hysteresis, nanocomposites, pyrolysis, silicon compounds, soft magnetic materials
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 12 Apr 2012 11:00
Official URL: http://dx.doi.org/10.1063/1.3062958
Identification Number: doi:10.1063/1.3062958
Funders: This work was financially supported by the Alexander von Humboldt (AvH) foundation.
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