Raman spectroscopy: a powerful tool for characterizing physical properties and dispersion of single wall carbon nanotubes.
Chirila MM; Chisholm WP; Harper M
Proceedings of the Seventh International Aerosol Conference, September 10-15, 2006, St. Paul, Minnesota. Biswas P, Chen DR, Hering S, eds. Mount Laurel, NJ: American Association for Aerosol Research, 2006 Sep; :170-171
Our observation of the appearance of the two new bands in the Raman spectrum could be interpreted as dispersal of the bundle lattice and de-bundling of ropes of SWCNTs after sonication of SWCNTs in surfactant. We believe the new bands represent small diameter nanotube bundles or ropes, which were part of larger bundles before sonication, and the small frequency shift of the main band from 190 to 200 cm(-1) shows the thinning of large bundles after the separation of smaller diameter bundles. Our experiments also point to a possible selectivity of the de-bundling process in favor of the smallest diameter tubes. By taking Raman spectra using many laser lines, the diameter distribution in the sample can be characterized. The process of dispersion of single wall carbon nanotubes could be used to obtain and to measure isolated SWCNT and to calculate a relative number of isolated versus bundled SWCNTs.
Author Keywords: Carbon nanotubes; Raman; De-bundling
Biswas P; Chen DR; Hering S
Proceedings of the Seventh International Aerosol Conference, September 10-15, 2006, St. Paul, Minnesota