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The effects of inhomogeneous isotope distribution on the vibrational properties of isotope enriched double walled carbon nanotubes
Author(s) -
Zólyomi V.,
Simon F.,
Rusznyák Á.,
Pfeiffer R.,
Peterlik H.,
Kuzmany H.,
Kürti J.
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.200776146
Subject(s) - fullerene , carbon nanotube , isotope , raman spectroscopy , diffusion , carbon fibers , isotopes of carbon , density functional theory , kinetic isotope effect , materials science , chemistry , tube (container) , stable isotope ratio , chemical physics , molecular physics , computational chemistry , nanotechnology , analytical chemistry (journal) , atomic physics , thermodynamics , deuterium , organic chemistry , composite material , physics , quantum mechanics , composite number , optics
The radial breathing mode in the Raman spectrum of 13 C isotope enriched single walled carbon nanotubes is inhomogeneously broadened due to the random distribution of isotopes. We study this effect theoretically using density functional theory within the local density approximation and compare the result with experiments on isotope engineered double walled carbon nanotubes in which the inner tubes were grown from a mixture of 13 C enriched fullerenes and natural fullerenes. As explained by the calculations, this synthesis procedure leads to an increased inhomogeneity compared to a case when only enriched fullerenes are used. The good agreement between the measurements and calculations shows the absence of carbon diffusion along the tube axis during inner tube growth, and presents a strong support of the theory that inner tube growth is governed by Stone–Wales transformations following the interconnection of fullerenes. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)