Raman studies of suspensions and solutions of singlewall carbon nanotubes

TL;DR

This paper uses Raman spectroscopy to analyze the structural and electronic properties of single-wall carbon nanotubes in suspensions and solutions, revealing solvent effects and charge transfer phenomena.

Contribution

It demonstrates how Raman spectroscopy can detect solvent-induced shifts and charge transfer in nanotube suspensions and solutions, providing new insights into their electronic behavior.

Findings

Radial breathing modes are upshifted in suspensions due to molecular pressure.

Charge transfer occurs in nanotube polyelectrolyte solutions and is reversible after oxidation.

Raman spectroscopy effectively probes structural and electronic changes in nanotube dispersions.

Abstract

Raman spectroscopy is used to probe the structure and electronic properties of nanotubes dispersed in a liquid phase. We show that the radial breathing modes are upshifted in suspensions due to the molecular pressure of the solvent. On the other hand, we directly probe charge transfer in solutions of nanotube polyelectrolytes and its reversibility after oxydation in air.