Development of graphene layers by reduction of graphite fluoride C₂F surface

Abstract

We studied a possibility of reduction of the surface of graphite fluoride obtained by fluorination of highly oriented pyrolytic graphite (HOPG) by a gaseous mixture of BrF 3 and Br 2 . X-ray diffraction (XRD) revealed a layered structure of the fluorinated product being a second-stage intercalate due to a presence of bromine molecules between the fluorinated graphite layers. Scanning tunneling microscopy and spectroscopy showed that the ''old'' surface of graphite fluoride (exposed to the ambient air) has the graphite-like structure, while the fresh cleaved surface is non-conductive. Therefore, the outer layers of graphite fluoride can be reduced by water present in the laboratory atmosphere. The sample was treated by H 2 O vapor to confirm that. The reduction was controlled by Raman spectroscopy using intensity of the 1360 and 1580 cm À1 bands. The energy dependent photoelectron spectroscopy was used for estimation of thickness of the reduction layer, which was found, does not exceed 2-3 graphite layers. The obtained results indicate the possibility of synthesis of graphene layers on dielectric fluorinated graphite matrix.

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

“…F-FLG nanosheets are composed of 3-4 layers (considering an interlayer separation of about 0.6 nm) with some thicker areas, which are presumably caused by wrinkling. [38] Our preliminary experiments showed that F-FLG reacted vigorously with hydrazine and instantly blackened and swelled upon interaction with ethylenediamine and butylamine, presumably forming a kind of pillared structures, similar to what was observed for graphene oxide. The dispersions in tert-butanol were stable in the liquid state for up to 1 week, which is enough for prospective processing steps.…”

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

“…chemical and/or thermal reduction of graphite derivatives such as graphite oxide (GO) 60 and graphite fluoride 61 appears to be the most suitable and efficient strategy (cf. Fig.…”

Spin-orbit coupling in fluorinated graphene

“…We perform first-principles density functional calculations in the dense and dilute limits of fluorine coverage, to quantify the spin-orbit splitting of the relevant energy bands. Our dense limit is given by the single-side semifluorinated graphene (C 2 F) which can be experimentally prepared by the chemical reduction of oxidized graphite surfaces [26]. Our study focuses on the chair conformation of C 2 F which is metallic within DFT, as well as within GW calculations [27].…”