Preparation and liquid-phase exfoliation of graphite fluoroxide towards graphene fluoroxide

Abstract

As a new graphene derivative, graphene fluoroxide (GFO) has not been fully studied because of its complex preparation process. In this paper, two simple methods, a modified Hummers' method and an improved method, were adopted to oxidize unsaturated commercial graphite fluoride (GIF) to prepare graphite fluoroxide (GIFO), the precursor of GFO. GFO was finally obtained via liquid-phase ultrasonic exfoliation of GIFO in organic solvents. Multiple spectroscopic techniques were used to characterize GIFO and GFO.The test results indicate that both of the two methods can covalently bond oxygen functional groups to graphene fluoride (GF) sheets successfully, but the modified Hummers' method gives higher yield and oxidizability. The structure of the GFO sheet is confirmed as few-layer by its atomic force microscopy results and transmission electron microscopy images. UV-vis and fluorescence emission measurements suggest that introducing oxygen groups into GF sheets can change their optoelectronic properties.Based on this, GFO with tunable optoelectronic properties might be facilely obtained in large batches through oxidization and liquid-phase exfoliation of unsaturated GIF with different fluorine coverage.

Reduction and transformation of fluorinated graphene induced by ultraviolet irradiation

“…The UV-vis absorption spectra ( Figure S6a in Supporting Information) of original FG dispersed in chloroform show a shoulder peak at around 342 nm, which may be attributed to n-π* transitions of FG due to the fluorine-doping. 49 The main wavelength of the photosource is 365 nm and the original FG has absorption intensity at this region. With ultraviolet irradiation, FG absorbs energy and C-F bonds are activated and go through the rupture.…”

Preparation and properties of a novel graphene fluoroxide/polyimide nanocomposite film with a low dielectric constant

“…First, GiFO nanosheets were synthesized from GiF powder with the routine as previously reported. 33 Typically, GiF powder (2 g) was added into a mixture of K 2 S 2 O 8 (1 g), P 2 O 5 (1 g), and concentrated H 2 SO 4 solution (15.2 mL). Aer stirring at 80 C for 8 h, a resultant dark mixture was obtained.…”

“…For GiFO, the presence of the broad peak at $10.6 and the absence of the peak at $26.6 suggest that the oxygen-containing functional groups are bonded to GiFO nanosheets and the interlayer spacing is thereby broadened to 0.83 nm. 29,33 Because of the intercalation of ODA into GiFO layers, the interlayer distance of GFO-ODA nanosheets is enlarged to 0.98 nm. According to these results, one can conclude that ODA units have successfully been bonded to the nanosheets.…”

“…Graphite uoride (GiF) as raw material was rst oxidized to prepare graphite uoroxide (GiFO) based on the process described in our previous work. 33 Then GFO was obtained by exfoliating GiFO and was modied with excess 4,4 0 -diaminodiphenyl ether (ODA). The amine-modied GFO nanosheets (GFO-ODA) provided a reactive platform for covalently bonding with PI chains.…”

The Influence of Dimensional Effects on the Composition and Properties of Polydicarbonfluoride

“…However, the compositions of the compounds obtained from graphene under similar conditions differ from those for graphite‐based compounds. For example, graphene fluoroxide was made by electrochemical oxidation of graphite in hydrofluoric acid with subsequent mechanical (so‐called “scotch‐method ”) exfoliation of graphene fluoroxide layer. But in 1947, Rüdorff obtained graphite bifluoride (acid salt of graphite) by graphite electrochemical oxidation .…”