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High pressure studies of the radial breathing modes in double‐wall carbon nanotubes
Author(s) -
Arvanitidis J.,
Christofilos D.
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.200672582
Subject(s) - tube (container) , raman spectroscopy , carbon nanotube , materials science , shield , work (physics) , breathing , excitation , composite material , thermodynamics , optics , physics , anatomy , geology , petrology , medicine , quantum mechanics
This work focuses on the high pressure Raman study of the radial breathing modes (RBMs) of bundled double‐wall carbon nanotubes (DWCNTs) using different excitation energies. The detailed examination of the Raman peaks attributed to the RBMs of the inner and outer tubes comprising the DWCNTs as a function of pressure provides a wealth of information concerning the pressure response of individual nanotubes as well as the inner‐outer tube (intratube) interactions. The outer tube acts as a protection shield for the inner tube whereas the latter increase the structural stability of the externals upon pressure application. More importantly, the pressure response of the inner tubes, expressed by the normalized pressure slopes Γ i = (1/ ω i ) (∂ ω i /∂ P ) vs. frequency of their RBMs, shows a remarkable grouping in quasi‐linear distributions wherein Γ i increases with ω . This behavior is explained by assuming that the pressure response of an internal tube is crucially dependent on the intratube spacing and thus the structural characteristics of the encapsulating tube. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)