Resonant Raman scattering of smallest single-walled carbon nanotubes

Z. K. Tang, J. P. Zhai, Y. J. Feng, X. J. Hu, R. Saito, Ping Sheng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationCarbon Nanotubes and Associated Devices
DOIs
Publication statusPublished - 2008 Nov 21
EventCarbon Nanotubes and Associated Devices - San Diego, CA, United States
Duration: 2008 Aug 102008 Aug 12

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7037
ISSN (Print)0277-786X

Other

OtherCarbon Nanotubes and Associated Devices
CountryUnited States
CitySan Diego, CA
Period08/8/1008/8/12

Keywords

  • Resonant Raman
  • Ultra-thin single-walled carbon nanotubes
  • Zeolite template

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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