Synthesis, Properties, and Dispersion of Few-Layer Graphene Fluoride

We have fluorinated few‐layer graphene (FLG) by using a low‐temperature fluorination route with gaseous ClF3. The treatment process resulted in a new graphene derivative with a finite approximate composition of C2F. TEM studies showed that the product consisted of thin transparent sheets with no mor...

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Bibliographic Details
Published in:Chemistry, an Asian journal an Asian journal, 2013-09, Vol.8 (9), p.2015-2022
Main Authors: Grayfer, Ekaterina D., Makotchenko, Viktor G., Kibis, Lidiya S., Boronin, Andrei I., Pazhetnov, Egor M., Zaikovskii, Vladimir I., Fedorov, Vladimir E.
Format: Article
Language:English
Subjects:
carbon
Chemistry
fluorine
graphene
Graphite
intercalation
photoelectron spectroscopy
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Summary:We have fluorinated few‐layer graphene (FLG) by using a low‐temperature fluorination route with gaseous ClF3. The treatment process resulted in a new graphene derivative with a finite approximate composition of C2F. TEM studies showed that the product consisted of thin transparent sheets with no more than 10 fluorographene layers stacked together. Spectroscopic methods revealed a predominantly covalent nature of the CF bonds in the as‐synthesized product and we found no evidence for the existence of so‐called “semi‐ionic” CF bonds, as observed in bulk CxF. In contrast to the case of graphite and typical (thick) expanded graphites, fluorination of FLG did not lead to the intercalation of ClF3 molecules, owing to the lack of a 3D layered structure. The approximate “critical” number of graphene layers that were necessary to form a phase of intercalated compound was estimated to be more than 12, thus providing a “chemical proof” of the difference between the properties of few‐layered graphenes and bulk graphites. Fluorographene C2F was successfully delaminated into thinner layers in organic solvents, which is an important property for its integration into electronic devices, nanohybrids, etc. From C2 shining sea: Few‐layered covalent graphene derivative C2F was obtained by a low‐temperature fluorination route with gaseous ClF3. In contrast to graphite and typical (thick) expanded graphites, fluorination of few‐layer graphene is not accompanied by ClF3 intercalation, owing to the lack of a 3D layered structure, thus revealing a difference between the properties of the obtained nanomaterial and bulk graphite‐like structures.
ISSN:1861-4728
1861-471X
DOI:10.1002/asia.201300401