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Bulusheva, L. G., Fedoseeva, Y. V., Flahaut, E., Rio, J., Ewels, C. P., Koroteev, V. O., Van Lier, G., Vyalikh, D. V. & Okotrub, A. V. (2017) Effect of the fluorination technique on the surface-fluorination patterning of double-walled carbon nanotubes. Beilstein Journal of Nanotechnology, 8 1688–1698.
Added by: Richard Baschera (2017-10-24 13:30:33) Last edited by: Richard Baschera (2017-10-24 13:55:06) |
| Type de référence: Article DOI: 10.3762/bjnano.8.169 Numéro d'identification (ISBN etc.): 2190-4286 Clé BibTeX: Bulusheva2017 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, PMN Créateurs: Bulusheva, Ewels, Fedoseeva, Flahaut, Koroteev, Okotrub, Rio, Van Lier, Vyalikh Collection: Beilstein Journal of Nanotechnology |
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| Résumé |
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Double-walled carbon nanotubes (DWCNTs) are fluorinated using (1) fluorine F-2 at 200 degrees C, (2) gaseous BrF3 at room temperature, and (3) CF4 radio-frequency plasma functionalization. These have been comparatively studied using transmission electron microscopy and infrared, Raman, X-ray photoelectron, and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. A formation of covalent C-F bonds and a considerable reduction in the intensity of radial breathing modes from the outer shells of DWCNTs are observed for all samples. Differences in the electronic state of fluorine and the C-F vibrations for three kinds of the fluorinated DWCNTs are attributed to distinct local surroundings of the attached fluorine atoms. Possible fluorine patterns realized through a certain fluorination technique are revealed from comparison of experimental NEXAFS F K-edge spectra with quantumchemical calculations of various models. It is proposed that fluorination with F-2 and BrF3 produces small fully fluorinated areas and short fluorinated chains, respectively, while the treatment with CF4 plasma results in various attached species, including single or paired fluorine atoms and -CF3 groups. The results demonstrate a possibility of different patterning of carbon surfaces through choosing the fluorination method.
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