Optical Parameter to Reveal the Interplay between Covalent Functionalization and the State of Aggregation of Single-Walled Carbon Nanotubes

Abstract : Single-walled carbon nanotubes (SWNTs) were functionalized in a three-step procedure:  a radical reaction leading to the introduction of p-methoxyphenyl groups, deprotection of the methoxy functions to generate free alcohol groups, and esterification to install a double bond for further polymerization. Visual dispersion tests in several solvents and thermal gravimetric analysis were used in conjunction with Raman spectroscopy to follow the three functionalization steps. Results indicated that the chemical procedure led to a functionalization yield as low as one grafted function per 110 carbon atoms and that the SWNTs were not homogeneously functionalized. Confocal Raman spectroscopy and optical microscopy observations, based on image analysis, were combined to objectively describe the state of aggregation of semiconducting SWNTs through calculation of an optical parameter. This parameter was found to be strongly correlated to some features of the Raman phonon modes, revealing the interplay between functionalization and aggregation effects. It is concluded that, to compare raw and functionalized SWNTs using confocal Raman spectroscopy, samples should be examined at similar states of aggregation.
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Manuel Dossot, Flavie Gardien, Victor Mamane, Yves Fort, Jie Liu, et al.. Optical Parameter to Reveal the Interplay between Covalent Functionalization and the State of Aggregation of Single-Walled Carbon Nanotubes. Journal of Physical Chemistry C, American Chemical Society, 2007, 111 (33), pp.12199 - 12206. ⟨10.1021/jp0719210⟩. ⟨hal-01848818⟩

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