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Article Dans Une Revue Chemistry of Materials Année : 2012

Comparative Study of SWCNT Fluorination by Atomic and Molecular Fluorine

Wei Zhang
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MI
Pierre Bonnet
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MI
Marc Dubois
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Katia Guérin
MI
Jean-Yves Mevellec
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André Hamwi
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MI

Résumé

Single-wall carbon nanotubes (SWCNTs) are fluorinated around 200 °C with molecular fluorine (F2) and xenon difluoride (XeF2) as fluorination agents. In this latter case, fluorination is carried out by atomic fluorine F* generated by the thermal decomposition of gaseous XeF2 on the nanotube surface. XeF2 treatment results in stoichiometries from CF0.05 to CF0.32, and F2 treatment gives compositions in the range CF0.04 and CF0.37. Transmission electronic microscopy (TEM), solid state Nuclear Magnetic Resonance (NMR), Raman scattering and Optical Absorption (AO) studies demonstrate that different fluorination mechanisms occur using molecular fluorine (F2) and atomic fluorine (F*). Atomic fluorine results in less sample damage and a more homogeneous fluorine distribution over the SWCNT surface than F2. This is explained via DFT calculations showing that HF catalyzed F2 deposition necessarily leads to highly fluorinated domain formation whereas F* addition occurs spontaneously at the initial species arrival site.
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Dates et versions

hal-00711813 , version 1 (25-06-2012)

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  • HAL Id : hal-00711813 , version 1

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Wei Zhang, Pierre Bonnet, Marc Dubois, Christopher Ewels, Katia Guérin, et al.. Comparative Study of SWCNT Fluorination by Atomic and Molecular Fluorine. Chemistry of Materials, 2012, 24, pp.1744-1751. ⟨hal-00711813⟩
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