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Proceedings Paper

Resonant Raman scattering of smallest single-walled carbon nanotubes
Author(s): Z. K. Tang; J. P. Zhai; Y. J. Feng; X. J. Hu; R. Saito; Ping Sheng
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Paper Abstract

Ultra-thin single wall carbon nanotubes (SWNTs) with a diameter of only 0.3 nm were synthesized in the nano-channels of AlPO4-11 porous single crystals. Raman spectra, with excitation wavelengths in the range from 457.9 to 647.1 nm, show excellent agreement with the density functional calculations of the Raman-active vibration modes of the armchair (2,2) SWCNTs. Calculated imaginary part of the dielectric function also displays qualitative agreement with the resonant Raman data. Interestingly, the (2,2) nanotube has two metastable ground state corresponding two slightly different lattice constants in axial direction, one state is metallic and the other is semiconducting. The polarizibility of the Raman modes agrees well with the calculated intensities for non-resonant Raman scattering, although the resonant Raman scattering plays a key role in the process. Both theory and experiment show the free-standing (2,2) SWNTs to be unstable. Confinement of the SWNTs in the nano-channels stablilizes the structure.

Paper Details

Date Published: 4 September 2008
PDF: 10 pages
Proc. SPIE 7037, Carbon Nanotubes and Associated Devices, 703707 (4 September 2008);
Show Author Affiliations
Z. K. Tang, Hong Kong Univ. of Science and Technology (Hong Kong China)
J. P. Zhai, Hong Kong Univ. of Science and Technology (Hong Kong, China)
Shenzhen Univ. (China)
Y. J. Feng, Hong Kong Univ. of Science and Technology (Hong Kong, China)
X. J. Hu, Hong Kong Univ. of Science and Technology (Hong Kong, China)
R. Saito, Tohoku Univ. and CREST, JST (Japan)
Ping Sheng, Hong Kong Univ. of Science and Technology (Hong Kong, China)

Published in SPIE Proceedings Vol. 7037:
Carbon Nanotubes and Associated Devices
Manijeh Razeghi; Didier Pribat; Young Hee Lee, Editor(s)

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