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Raman diagnostics of multi‐wall carbon nanotubes with a small wall number
Author(s) -
Bokova S. N.,
Obraztsova E. D.,
Grebenyukov V. V.,
Elumeeva K. V.,
Ishchenko A. V.,
Kuznetsov V. L.
Publication year - 2010
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.201000237
Subject(s) - raman spectroscopy , carbon nanotube , materials science , graphite , raman scattering , spectral line , analytical chemistry (journal) , nanotube , optical properties of carbon nanotubes , carbon fibers , phonon , intensity (physics) , nanotechnology , composite material , optics , chemistry , condensed matter physics , composite number , physics , chromatography , astronomy
Raman spectroscopy study of multi‐wall carbon nanotubes (MWNTs) of different diameters (with a small controllable number of walls) produced using Fe–Co catalyst with a variable size of the same active component has been performed. We have characterized as produced MWNTs with different diameters (series 1) and two types of tubes with fixed mean diameters (∼10 and 20 nm) heated in a flow of pure argon at various temperatures (2200, 2600 and 2800 °C – series 2). The Raman spectra of MWNTs have been registered in three spectral regions, corresponding to D (disorder‐induced), G (graphite) and 2D (two‐phonon scattering) bands. A ratio of intensities I 2D / I D for tubes of series 1 has demonstrated almost a linear dependence on the nanotube diameter. After heating (series 2), D (disorder‐induced) Raman band has shown a substantial decrease in intensity. The variation of the Raman spectra parameters is discussed in terms of defectiveness of nanotubes.