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Effects on Raman spectra of functionalisation of single walled carbon nanotubes by nitric acid
Author(s) -
Mases M.,
Noël M.,
Mercier G.,
Dossot M.,
Vigolo B.,
Mamane V.,
Fort Y.,
Soldatov A. V.,
McRae E.
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.201100082
Subject(s) - nitric acid , raman spectroscopy , carbon nanotube , intercalation (chemistry) , carboxylation , graphite , microstructure , materials science , molecule , carbon fibers , chemical engineering , grafting , chemistry , nanotechnology , inorganic chemistry , organic chemistry , composite number , composite material , catalysis , physics , polymer , optics , engineering
In the ultimate aim of grafting a fluorescent group on carbon nanotubes (CNTs) using COOH functions as anchoring groups, it was realised that optimisation of the carboxylation step of the CNTs was essential in the overall process. To reach this goal, three different treatment times with refluxed nitric acid have been tested: 2, 5 and 10 h. Electron microscopy has allowed evaluating the microstructure changes and the chemical composition on a local level. Raman spectroscopy has revealed a number of interesting evolutions especially in the D and G bands spectral region. It seems that residual nitric acid molecules may partially transfer charge to CNTs, giving rise to a doping effect, as is well known in graphite intercalation compounds.