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Mechanical Degradation of Carbon Nanotubes: ESR Investigations

Published online by Cambridge University Press:  26 February 2011

Mircea Chipara ,
Akos Kukovecz ,
Zoltan Konia ,
Jeffrey M. Zaleski  and
Magdalena Chipara
Mircea Chipara
Affiliation:
mchipara@indiana.edu, Indiana University, Chemistry Department, 800 E. Kirkwood Ave., Bloomington, IN, 47405, United States, 812 339 2122, 812 855 8300
Akos Kukovecz
Affiliation:
kakos@chem.u-szeged.hu, Hungary
Zoltan Konia
Affiliation:
konia@chem.u-szeged.hu, Hungary
Jeffrey M. Zaleski
Affiliation:
zaleski@indiana.edu, Indiana University, Chemistry Department, United States
Magdalena Chipara
Affiliation:
magdachipara@yahoo.com, Parttec, United States
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Abstract

ESR investigations on milled multiwalled carbon nanotubes are reported. The ESR spectra of pristine and milled nanotubes consists of two resonances, a wide line located at g>3.0 assigned to magnetic particles (catalysts residues) and a broad line with a peak to peak linewidth of about 10−2 T located at g=2.05 and assigned to the interaction between the conducting electrons delocalized over carbon nanotubes and magnetic ions. It was observed that this line depends on the milling time. For short milling times (up to 125 minutes) both the resonance linewidth and the g-factor increase as the milling time is increased. Longer milling times resulted in a decrease of both the g-factor and resonance linewidth as the milling time was increased. This behavior was assigned to the removal of the magnetic nanoparticles from nanotubes. No resonance line due to the destruction of carbon nanotubes was observed.

Keywords

Celectron spin resonancenanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 887: Symposium Q – Degradation Processes in Nanostructured Materials , 2005 , 0887-Q01-05
Copyright
Copyright © Materials Research Society 2006

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References

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