ISSN:
1434-6036
Keywords:
PACS. 73.63.Fg Nanotubes – 63.50.+x Vibrational states in disordered systems – 78.30.-j Infrared and Raman spectra
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: Raman spectra of single-wall carbon nanotubes (CNTs) either in the form of micrometer sized bundles or thin layers prepared by dilution and sonication of powders have been compared. We have been able to collect the Raman spectrum of nanotube bundles that are not in touch with the substrate, and therefore not affected by interactions with the substrate surface. This spectrum resulted to be similar to that of the precursor nanotube powders, whereas relevant changes in the Raman spectrum are detected when the diluted powders form very thin layers on either metallic or insulating surfaces, as probed by confocal microraman imaging on well defined areas of the CNTs layers. In the case of thin layers, the intensity of the Raman D band, detected between 1 320 and 1 340 cm-1 and ascribed to disorder effects, is strongly enhanced. This enhancement occurs independently on the kind of substrate.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1140/epjb/e2003-00024-8
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