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Far Infrared Characterization of Single and Double Walled Carbon Nanotubes

Published online by Cambridge University Press:  24 March 2011

S. G. Chou
Affiliation:
Physical Measurement Laboratory, National Institute of Standard and Technology, Gaithersburg, MD20899
Z. Ahmed
Affiliation:
Physical Measurement Laboratory, National Institute of Standard and Technology, Gaithersburg, MD20899
G.G. Samsonidze
Affiliation:
Department of Physics, University of California and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720
J. Kong
Affiliation:
Department of EECS, Massachusetts Institute of Technology, Cambridge, MA02139
M. S. Dresselhaus
Affiliation:
Department of EECS, Massachusetts Institute of Technology, Cambridge, MA02139 Department of Physics, Massachusetts Institute of Technology, Cambridge, MA02139
D. F. Plusquellic
Affiliation:
Physical Measurement Laboratory, National Institute of Standard and Technology, Gaithersburg, MD20899
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Abstract

High resolution far infrared absorption measurements were carried out for single walled and double walled carbon nanotubes samples (SWCNT and DWCNT) encased in a polyethylene matrix to investigate the temperature and bundling effects on the low frequency phonons associated with the low frequency circumferential vibrations. At a temperature where kBT is significantly lower than the phonon energy, the broad absorption features as observed at room temperature become well resolved phonon transitions. For a DWCNT sample whose inner tubes have a similar diameter distribution as the SWCNT sample studied, a series of sharp features were observed at room temperature at similar positions as for the SWCNT samples studied. The narrow linewidth is attributed to the fact that the inner tubes are isolated from the polyethylene matrix and the weak inter-tubule interactions. More systematic studies will be required to better understand the effects of inhomogeneous broadening and thermal-excitation on the detailed position and lineshape of the low frequency phonon features in carbon nanotubes.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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References

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