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Curvature effects in the D* band of small diameter carbon nanotubes
Author(s) -
Kürti J.,
Zólyomi V.,
Koltai J.,
Simon F.,
Pfeiffer R.,
Kuzmany H.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200776168
Subject(s) - curvature , softening , raman spectroscopy , carbon nanotube , materials science , dispersion (optics) , oscillation (cell signaling) , phonon , molecular physics , condensed matter physics , nanotechnology , optics , chemistry , composite material , physics , geometry , biochemistry , mathematics
Abstract The energy dispersion of the D* (G′) band shows a strong diameter dependence according to Raman measurements on double walled carbon nanotubes. The Raman shift of the small diameter inner tubes shows an average softening. There is an oscillation around an average linear behavior with slopes of 108 cm –1 /eV and 61 cm –1 /eV for the outer and inner tubes, respectively. We show that the experimental observation can be reproduced by simple model calculations if the curvature effects are taken into account. The phonon softening with increasing curvature was proven by first principles calculations. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)