Open AccessSimilarities in the Raman RBM and D bands in double-wall carbon nanotubes
Author(s) -
P Puech,
A. Bassil,
J. González,
Ch. Power,
Emmanuel Flahaut,
Sophie Barrau,
Ph. Demont,
C. Lacabanne,
Émile Perez,
Wolfgang Bacsa
Publication year - 2005
Publication title -
physical review b
Language(s) - English
Resource type - Journals
eISSN - 1538-4489
pISSN - 1098-0121
DOI - 10.1103/physrevb.72.155436
Subject(s) - raman spectroscopy , carbon nanotube , intensity (physics) , g band , phonon , materials science , excitation , d band , molecular physics , dispersion (optics) , physics , condensed matter physics , atomic physics , optics , nanotechnology , quantum mechanics
We have examined several sets of heterogeneous double wall carbon nanotubes and analysed the frequency in a wide range of values. We have found that a statistical correlation exists between the D band intensity and the RBMs intensity. All the sample sets show a correlation of the RBM and D Raman intensity which is monotonic and non-linear using the 514nm laser excitation. Our results suggest that a similar mechanism is at the origin of the RBM and D bands. These results are corroborated by observations on carbon nanotubes embedded in a polymer matrix. We derive the phonon potential deformation for the D band and extend the excitation wavelength dependence of the D band to the UV. The intensity of the D band decreases with increasing hydrostatic pressure and fanishes at a pressure comparable to what has been observed earlier for the RBM and D* band
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