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Synthesis and Characterization of Highly Fluorinated Graphite Containing sp2 and sp3 Carbon

par Guérin, Katia;Pinheiro, J.P.;Dubois, Marc Alexandre;Fawal, Ziad El;Masin, Francis ;Yazami, Rachid;Hamwi, André
Référence Chemistry of materials, 16, 9, page (1786-1792)
Publication Publié, 2004-05

Article révisé par les pairs

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Résumé :

Highly fluorinated graphites were obtained by reaction of fluorine with graphite, at room temperature, in the presence of iodine pentafluoride and hydrogen fluoride. The re-fluorination between 100 and 600 °C yielded a series of fluorinated graphites with semi-ionic and covalent C-F bonds with varying amounts of sp2- and sp3-type carbon hybridization. Three types of materials have been generated: for re-fluorination lower than 400 °C, the C-F bond is still mainly semi-ionic and the carbon atoms are sp2 coplanar; for re-fluorination temperatures between 400 and 550 °C, "hybrid" graphite fluorides characterized by two types of C-F bonds, semi-ionic and covalent, with sp2 and sp3 carbon hybridization were found. For higher re-fluorination temperatures (between 550 and 600 °C), despite a similar fluorination amount and a covalent C-F bond, the sp2 character never completely vanished even at a high re-fluorination temperature of 600 °C. At such a temperature, a directly fluorinated graphite would be of the pure sp3 type.