Abstract
This Letter reports the laser energy dependence of the Stokes and anti-Stokes Raman spectra of carbon nanotubes dispersed in aqueous solution and within solid bundles, in the energy range 1.52–2.71 eV. The electronic transition energies () and the radial breathing mode frequencies () are obtained for 46 different (18 metallic and 28 semiconducting) nanotubes, and the assignment is discussed based on the observation of geometrical patterns for versus graphs. Only the low energy component of the value is observed from each metallic nanotube. For a given nanotube, the resonant window is broadened and down-shifted for single wall carbon nanotube (SWNT) bundles compared to SWNTs in solution, while by increasing the temperature, the energies are redshifted for [] nanotubes and blueshifted for [] nanotubes.
- Received 23 April 2004
DOI:https://doi.org/10.1103/PhysRevLett.93.147406
©2004 American Physical Society