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Diameter-Selective Raman Scattering from Vibrational Modes in Carbon Nanotubes

Rao1, Richter, Bandow

  • 1A. M. Rao and P. C. Eklund, Department of Physics and Astronomy and Center for Applied Energy Research, University of Kentucky, Lexington, KY 40506-0055, USA. E. Richter, K. A. Williams, S. Fang, K. R. Subbaswamy, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA. S. Bandow, Instrument Center, Institute for Molecular Science, Myodaiji, Okazaki 444, Japan. B. Chase, Dupont Experimental Station, E328163, P.O. Box 80328, Wilmington, DE 19880-0328, USA. M. Menon, Department of Physics and Astronomy and Center for Computational Sciences, University of Kentucky, Lexington, KY 40506-0055, USA. A. Thess and R. E. Smalley, Department of Chemistry, Rice University, Houston, TX 77005, USA. G. Dresselhaus, Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. M. S. Dresselhaus, Department of Physics and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|January 10, 1997
PubMed
Summary

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This summary is machine-generated.

Raman spectroscopy reveals vibrational modes in single-wall carbon nanotubes (SWNTs). Lattice dynamics calculations and polarizability models support the experimental data, indicating quantum confinement effects.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Single-wall carbon nanotubes (SWNTs) exhibit unique properties due to their one-dimensional structure.
  • Understanding their vibrational properties is crucial for applications.
  • SWNTs often form crystalline ropes in close-packed arrays.

Purpose of the Study:

  • To investigate the vibrational modes of SWNTs using Raman scattering.
  • To correlate experimental Raman spectra with theoretical models.
  • To explore the influence of quantum confinement on Raman scattering.

Main Methods:

  • Raman scattering spectroscopy with excitation wavelengths from 514.5 to 1320 nm.
  • Lattice dynamics calculations using C-C force constants.

Related Experiment Videos

  • Comparison with experimental phonon dispersion of graphene.
  • Application of a nonresonant bond polarizability model.

    • Main Results:

    • Numerous Raman peaks were observed and assigned to specific vibrational modes of armchair (n, n) SWNTs.
    • Experimental spectra showed good agreement with lattice dynamics calculations.
    • Calculated intensities from the polarizability model were in qualitative agreement with Raman data.
    • Evidence for resonant Raman scattering due to 1D quantum confinement was identified.

    Conclusions:

    • Raman spectroscopy is effective for characterizing SWNT vibrational modes.
    • Lattice dynamics and polarizability models provide valuable insights into SWNT behavior.
    • One-dimensional quantum confinement significantly influences the resonant Raman scattering process in SWNTs.