Evidence for Size-Dependent Discrete Dispersions in Single-Wall Nanotubes

A. Kasuya; Y. Sasaki; Y. Saito; K. Tohji; Y. Nishina

doi:10.1103/PhysRevLett.78.4434

Evidence for Size-Dependent Discrete Dispersions in Single-Wall Nanotubes

A. Kasuya, Y. Sasaki, Y. Saito, K. Tohji, and Y. Nishina

Phys. Rev. Lett. 78, 4434 – Published 9 June 1997

Abstract

Raman scattering spectra of single-wall nanotubes with mean radii 0.55, 0.65, and 1.0 nm show size-dependent multiple splittings of the optical phonon peak corresponding to the $E_{2 g}$ mode in graphite. These splittings constitute the first experimental evidence for the unique feature of nanotubes that they exhibit discrete and diameter-dependent dispersions arising from their cylindrical symmetry. The observed dispersion is well explained on the basis of graphite, and shows possibilities of predicting and controlling the basic property of nanotubes in the zone-folding scheme.

Received 23 December 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.4434

Authors & Affiliations

A. Kasuya¹, Y. Sasaki², Y. Saito³, K. Tohji⁴, and Y. Nishina^1,2

¹Institute for Materials Research, Tohoku University, Sendai 980-77, Japan
²Department of Basic Science, Ishinomaki Senshu University, Ishinomaki 986, Japan
³Department of Electrical and Electronic Engineering, Mie University, Tsu 514, Japan
⁴Department of Geoscience and Technology, Tohoku University, Sendai 980-77, Japan