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

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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [49 references]  Display  Hide  Download

Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Friday, December 13, 2019 - 2:12:18 PM
Last modification on : Friday, January 10, 2020 - 9:08:27 PM


 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2020-05-22

Please log in to resquest access to the document




Lyubov G. Bulusheva, Egor V. Lobiak, Yu.V. Fedoseeva, Jean-Yves Mevellec, Anna A. Makarova, et al.. Effect of ultrasound pretreatment on bromination of double-walled carbon nanotubes. Synthetic Metals, Elsevier, 2020, 259, pp.116233. ⟨10.1016/j.synthmet.2019.116233⟩. ⟨hal-02409386⟩



Record views