Graphite fluorides: An XPS study of a new type of CF bonding

✍ Scribed by I. Palchan; M. Crespin; H. Estrade-Szwarckopf; B. Rousseau

• Book ID: 103028442
• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 606 KB
• Volume: 157
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(89)87255-0

✦ Synopsis

Highly oriented pyrolytic graphite was fluorinated at room temperature with molecular fluorine at 2.5 atm for 8 days to 2 months without addition of any catalyst. Under these mild conditions we obtained graphite-fluorine intercalation compounds in a wide range of stoichiometry 64 > C/F> 4. Except for the highest fluorine content (C/F< 4) all our samples are better conductors than graphite. A thorough XPS study of clean cleaved internal surfaces of the oriented samples shows a new kind of carbonlluorine bonding. The binding energies of the C,, and F,, photoemission peaks are 287.3 +0.2 and 685.7+0.2 eV. These values differ from those of typical covalent bonds (290.4 and 689.6 eV) and the nature of the bond is probably different from that of covalent C-F.