Fine Structure of the Radial Breathing Mode in Double-Wall Carbon Nanotubes

TL;DR

This paper investigates the detailed structure of radial breathing modes in double-wall carbon nanotubes using Raman scattering, revealing how inner and outer tube interactions influence optical properties and resonance behaviors.

Contribution

It provides a detailed analysis of the radial breathing mode structure, identifying clusters of resonance behaviors and their relation to inner-outer tube pairs in double-wall carbon nanotubes.

Findings

Raman lines cluster into species with similar resonance behavior

Clusters correspond to specific inner-outer tube pairs

Number of components in clusters increases with decreasing inner tube diameter

Abstract

The analysis of the Raman scattering cross section of the radial breathing modes of double-wall carbon nanotubes allowed to determine the optical transitions of the inner tubes. The Raman lines are found to cluster into species with similar resonance behavior. The lowest components of the clusters correspond well to SDS wrapped HiPco tubes. Each cluster represents one particular inner tube inside different outer tubes and each member of the clusters represents one well defined pair of inner and outer tubes. The number of components in one cluster increases with decreasing of the inner tube diameter and can be as high as 14.