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Comparative Raman spectroscopy of individual and bundled double wall carbon nanotubes
Author(s) -
Puech Pascal,
Nanot Sébastien,
Raquet Bertrand,
Broto JeanMarc,
Millot Marius,
Anwar Abdul Waheed,
Flahaut Emmanuel,
Bacsa Wolfgang
Publication year - 2011
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.200945548
Subject(s) - raman spectroscopy , carbon nanotube , materials science , tube (container) , graphene , molecular physics , excitation , spectral line , spectroscopy , spectral line shape , line (geometry) , laser , atomic physics , optics , nanotechnology , chemistry , composite material , physics , geometry , mathematics , quantum mechanics , astronomy
Raman spectra of individual double wall carbon nanotubes(DWs) on silica show a splitting of the G band due to contributions of the inner and outer tube when using a excitation energy in resonance with the inner metallic tube and outer semiconducting tube. The spectral splitting indicates strong coupling while a previous report [Nanoletters 8 , 3879 (2008)] shows uncoupled inner and outer tubes. The spectral line widths are comparable to what has been observed for individual single wall carbon nanotubes (SWs) or graphene. The spectral position of the inner tube is consistent with previous extrapolations from measurements under high pressure and on chemically doped double wall tubes. Bundling of DWs leads to heterogeneous increase of the G band line width. Increased laser power shifts the G band of the outer tube to higher energies and modifies its line shape.