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Identification of the constituents of double-walled carbon nanotubes using Raman spectra taken with different laser-excitation energies

Published online by Cambridge University Press:  31 January 2011

Feng Li ,
S. G. Chou ,
Wencai Ren ,
J. A. Gardecki ,
A. K. Swan ,
M. S. Ünlü ,
B. B. Goldberg ,
Hui-Ming Cheng  and
M. S. Dresselhaus
Feng Li
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China
S. G. Chou
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Wencai Ren
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China
J. A. Gardecki
Affiliation:
George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
A. K. Swan
Affiliation:
Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215
M. S. Ünlü
Affiliation:
Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215
B. B. Goldberg
Affiliation:
Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215
Hui-Ming Cheng*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China
M. S. Dresselhaus
Affiliation:
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
*
a)Address all correspondence to this author. e-mail: [email protected]

Abstract

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Double-walled carbon nanotubes (DWNTs), synthesized by the catalytic decomposition of methane, were explored by resonance Raman spectroscopy using different energies for laser excitation. Based on the radial breathing mode frequencies, the indices of the two layers of a DWNT were approximately assigned, depending on the interlayer separation of the two coaxial layers of the DWNT, which ranged from 0.34 to 0.40 nm. From the tentatively assigned results, it was found that the two walls of the DWNT are not strongly selected by chirality and diameter. The results, however, suggest that, for the tubes that are resonant with the available laser excitation energies, most of the outer layers of the observed DWNTs in our samples are semiconducting, while the inner layers of the observed DWNTs are either semiconducting or metallic based on the assembled DWNTs. The characteristics of the G, D, and G′ band of the DWNTs are discussed, and a double peak feature in the D and G′ band, originating from the inner and outer layers of the DWNTs, is reported.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 5 , May 2003 , pp. 1251 - 1258
Copyright
Copyright © Materials Research Society 2003

References

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