Diameter-selective Raman scattering from vibrational modes in carbon nanotubes

Journal Article · Fri Jan 10 04:00:00 EST 1997 · Science

DOI:https://doi.org/10.1126/science.275.5297.187· OSTI ID:450647

Rao, A M; Eklund, P C; Richter, E ^[1]

---

1. Univ. of Kentucky, Lexington, KY (United States); and others

Single wall carbon nanotubes (SWNTs) that are found as close-packed arrays in crystalline ropes have been studied by using Raman scattering techniques will laser excitation wavelengths in the range from 514.5 to 1320 nanometers. Numerous Raman peaks were observed and identified with vibrational modes of armchair symmetry (n,n) SWNTs. The Raman spectra are in good agreement with lattice dynamics calculations based on C-C force constants used to fit the two-dimensional, experimental phonon dispersion of a single graphene sheet. Calculated intensities from a nonresonant, bond polarizability model optimized for sp{sup 2} carbon are also in qualitative agreement with the Raman data, although a resonant Raman scattering process is also taking place. This resonance results from the one-dimensional quantum confinement of the electrons in the nanotube. 25 refs., 4 figs.

• OSTI ID: 450647
• Journal Information: Science, Journal Name: Science Journal Issue: 5297 Vol. 275; ISSN SCIEAS; ISSN 0036-8075
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
CRYSTAL STRUCTURE
FILAMENTS
THICKNESS