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Bromination of double-walled carbon nanotubes

Bulusheva, Lyubov Gennadievna and Okotrub, Alexander Vladimirovich and Flahaut, Emmanuel and Asanov, Igor P. and Gevko, Pavel N. and Koroteev, V. O. and Fedoseeva, Yu. V. and Yaya, Aboubakar and Ewels, Chris P. Bromination of double-walled carbon nanotubes. (2012) Chemistry of Materials, 24 (14). 2708-2715. ISSN 0897-4756

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Official URL: http://dx.doi.org/10.1021/cm3006309

Abstract

Double-walled carbon nanotubes (DWCNTs) synthesized by catalytic chemical vapor deposition (CCVD) have been functionalized by bromine vapor at room temperature. At least two different bromine species were detected in the product using X-ray photoelectron spectroscopy (XPS) and thermal gravimetric analysis. The primary form is negatively charged Br2 molecules exhibiting an intense resonance at ∼238 cm−1 in the Raman spectrum. The electron transfer from the nanotubes to the adsorbed molecules is detected from C 1s XPS and near-edge X-ray absorption fine structure spectra. The optical absorption spectra reveal that although the metallic nanotubes are more reactive to Br2, the outer semiconducting nanotubes also readily interact with Br2 adsorbates. The secondary bromine form is attributed to covalent C-Br bonding, and its possible sources are discussed in the light of quantum-chemical calculations. Analysis of the XPS, Raman, and optical absorption spectra of the Br-DWCNTs annealed at 100-170 ° C indicates preservation of a part of bromine molecules in samples that affects the electronic and vibration properties of nanotubes.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Nantes (FRANCE)
Other partners > Russian academy of sciences (RUSSIA)
Other partners > University of Ghana - UG (GHANA)
Laboratory name:
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Deposited By: cirimat webmestre
Deposited On:05 Sep 2013 13:57

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