Published in:
physica status solidi (b), 246 (2009) 11-12, Seite 2717-2720
Language:
English
DOI:
10.1002/pssb.200982297
ISSN:
0370-1972;
1521-3951
Origination:
Footnote:
Description:
AbstractA comparative study will be presented on the effect of strong acid treatments in both single‐walled (SWCNT) and multi‐walled carbon nanotubes (MWCNT). The effects were studied by Raman spectroscopy. The results show that in SWCNT the raw sample shows a broader G band, well fitted by a Breit–Wigner–Fano line in comparison with the acid treated sample, which can be fitted using a Lorentzian lineshape. The original shape of this feature is recovered after the annealing step. In MWCNT samples, a two‐peak G′ band profile was observed after the acid treatment, originated by an exfoliation effect.magnified imageSchematic illustration of the effects of acid treatment. On SWCNT, phase I corresponds to the intercalation in the interstitial channels of the bundles, while phase II is assigned to the intercalation between the walls of neighbouring nanotubes. On MWCNT, intercalation into the walls and consequent exfoliation is represented.