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Raman spectroscopic characterization of submicron vapor-grown carbon fibers and carbon nanofibers obtained by pyrolyzing hydrocarbons

Published online by Cambridge University Press:  31 January 2011

M. Endo
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
K. Nishimura
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
Y. A. Kim
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
K. Hakamada
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
T. Matushita
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
M. S. Dresselhaus
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
G. Dresselhaus
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Abstract

Variations of the properties of submicron vapor-grown carbon fibers (VGCFs) and nanofibers, with diameters around 0.1–0.2 μm and 80–100 nm, respectively, are observed by Raman spectroscopy as a function of heat-treatment temperature. The microstructural evolution strongly depends on the original properties of the material, such that the main transition temperatures associated with the onset for establishing two-dimensional graphene ordering are defined below 1500 °C for the nanofibers and 2000 °C for the submicron VGCFs, respectively. The relative intensities (ID/IG) of the as-grown phase for submicron VGCFs and nanofibers are 3.44 and 1.35, while those for the corresponding graphitized samples are 0.393 and 0.497, respectively.

Type
Articles
Copyright
Copyright © Materials Research Society 1999

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References

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