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Carbon nanotube bundles and thin layers probed by micro-Raman spectroscopy

  • L. Sangaletti
  • S. Pagliara
  • F. Parmigiani
  • P. Galinetto
  • R. Larciprete
  • S. Lizzit
  • A. Goldoni

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.

PACS. 73.63.Fg Nanotubes – 63.50.+x Vibrational states in disordered systems – 78.30.-j Infrared and Raman spectra 

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Copyright information

© EDP Sciences, Springer-Verlag 2003

Authors and Affiliations

  • L. Sangaletti
    • 1
  • S. Pagliara
    • 1
  • F. Parmigiani
    • 1
  • P. Galinetto
    • 2
  • R. Larciprete
    • 3
  • S. Lizzit
    • 3
  • A. Goldoni
    • 3
  1. 1.Dipartimento di Matematica e Fisica and INFM, Università Cattolica, Via dei Musei 41, 25121 Brescia, ItalyIT
  2. 2.Dipartimento di Fisica “A. Volta” and INFM, Università di Pavia, Via Bassi 6, Pavia, ItalyIT
  3. 3.Sincrotrone Trieste, s.s. 14 Km 163,5 in Area Science Park, 34012 Trieste, ItalyIT

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