A13-104 EFFECT OF CARBON ISOTOPE ABUNDANCE ON THERMAL CONDUCTIVITY AND RAMAN SCATTERING OF SINGLE-WALLED CARBON NANOTUBES

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概要

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• Since there is about 1 % of ^<13>C isotope in natural abundance of carbon atoms, normal carbon nanotubes are made of carbon atoms with different masses. The vibrational features of single-walled carbon nanotubes (SWNTs) due to the isotope effect were studied through the alcohol catalytic CVD (ACCVD) generation and resonant Raman scattering of isotopically modified SWNTs, and through molecular dynamics simulations of phonon density of states (DOS) and heat conduction. SWNTs with various amount of ^<13>C abundance were generated by ACCVD technique from isotopically modified ethanol : ^<13>CH_3-^<13>CH_2-OH, ^<13>CH_3-CH_2-OH, and CH_3-^<13>CH_2-OH. The Raman scattering of these SWNTs showed a simple shift of Raman scattering frequency for ^<13>C SWNTs. By comparing the change in Raman spectra for ^<13>C and ^<12>C mixture cases, it was concluded that about a half of C-O bond of an original ethanol is completely broken at the decomposition process of ethanol. Those Raman features were compared with phonon DOS calculated with molecular dynamics method. Furthermore, by molecular dynamics simulations, thermal conductivity of SWNTs with randomly distributed ^<13>C with various ratios was calculated. A preliminary result showed that the dependency of thermal conductivity on isotope ratio was well explained with a simple phonon scattering model.

• 一般社団法人日本機械学会の論文
• 2003-11-30

著者

• MARUYAMA Shigeo

  Department of Mechanical Engineering, School of Engineering, The University of Tokyo

• TANIGUCHI Yuki

  Department of Molecular Medicine, Osaka University Graduate School of Medicine

• Miyauchi Yuhei

  Department Of Mechanical Engineering The University Of Tokyo

• Taniguchi Yuki

  Department Of Chemical Science And Technology Faculty Of Engineering Kyushu University

• Taniguchi Yuki

  Department Of Mechanical Engineering The University Of Tokyo

• Maruyama Shigeo

  Department Of Mechanical Engineering The University Of Tokyo

• Maruyama Shigeo

  Department Of Internal Medicine Gotsu General Hospital

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