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Effect of ultrasound pretreatment on bromination of double-walled carbon nanotubes

Bulusheva, Lyubov G. and Lobiak, Egor V. and Fedoseeva, Yu.V. and Mevellec, Jean-Yves and Makarova, Anna A. and Flahaut, Emmanuel and Okotrub, Alexander Vladimirovich Effect of ultrasound pretreatment on bromination of double-walled carbon nanotubes. (2020) Synthetic Metals, 259. 116233. ISSN 0379-6779

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Official URL: https://doi.org/10.1016/j.synthmet.2019.116233

Abstract

Bromination of double-walled carbon nanotubes (DWCNTs) was carried out using a saturated vapor of Br2 at room temperature with or without a pretreatment in bromine water. X-ray photoelectron spectroscopy revealed that ultrasound pretreatment modified the chemical state of bromine in the product. The binding energies of the Br 3d electrons in the pre-sonicated DWCNT sample were between those characteristic of the covalent C–Br bonds and the negatively charged Br2 molecules, observed when the pretreatment was not performed. Raman spectroscopy, however, clearly evidenced Br–Br vibrations in both brominated samples. Calculations of CNT–Br2 models within density functional theory were used to propose that the electronic state of a Br2 molecule depends on the adsorption site. The bromine molecules prefer to be located near edge hydroxyl groups, which acept the electron density from Br2. This increases the binding energy of Br 3d levels as compared to that for Br2 molecules in other adsorption sites.

Item Type:Article
HAL Id:hal-02409386
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Freie Universität Berlin (GERMANY)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Siberian Branch of the Russian Academy of Sciences - SB RAS (RUSSIA)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Nantes (FRANCE)
Other partners > Tomsk State University - TSU (RUSSIA)
Laboratory name:
Funders:
PRC CNRS/RFBR - bilateral Program “Russian German Laboratory at BESSY”
Statistics:download
Deposited By: Yves MOMBOISSE
Deposited On:13 Dec 2019 13:12

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