Resonance behavior of the defect-induced Raman mode of single-chirality enriched carbon nanotubes

TL;DR

This study investigates the resonance behavior of the defect-induced D mode in highly enriched (9,7) single-walled carbon nanotubes, revealing how resonance affects the D mode's intensity and dispersion through experimental and numerical analysis.

Contribution

It provides new insights into the resonance behavior of the D mode in specific chiral nanotubes using combined experimental and numerical methods.

Findings

D mode intensity peaks near the optical transition of (9,7) nanotubes

D-mode dispersion is only observed above a certain excitation energy

Numerical simulations successfully explain the observed resonance phenomena

Abstract

We present a resonance Raman study of the disorder-induced D mode in a sample highly enriched with semiconducting (9,7) single-walled carbon nanotubes in the excitation energy range of 1.49 - 2.05 eV. The intensity of the D mode shows a resonance behavior near the optical transition of the (9,7) tube. The well-known dispersion of the D-mode frequency, on the other hand, is not observed at the resonance, but only above a certain excitation energy. We explain our results by numerical simulations of the D-mode spectra.