Chemical composition and crystal structure of graphite fluoride

Kita, Yasushi; Watanabe, Nobuatsu; Fujii, Yukio

doi:10.1021/ja00508a020

Cited by 280 publications

(211 citation statements)

References 19 publications

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“…This material is a thermally and chemically stable insulator with similar mechanical strength to graphene, offering a range of possible applications [8][9][10][11][12][13] . However the reported two-dimensional (2D) lattice constant for CF is B0.248 nm, which is apparently expanded only 1% relative to graphene, significantly lower than the 2.8% expanded lattice constant for monolayer CF predicted by the density functional theory (DFT) and notably also less than the 2.8-4.5% expanded lattice constant variously reported for graphite fluoride 8,10,14,15 . The observed lower lattice parameter reported for CF indicates that this phase may undergo significant lattice corrugation that will impair its utility in any application requiring a 'flat' 2D morphology.…”

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confidence: 66%

Atomically resolved imaging of highly ordered alternating fluorinated graphene

et al. 2014

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One of the most desirable goals of graphene research is to produce ordered two-dimensional (2D) chemical derivatives of suitable quality for monolayer device fabrication. Here we reveal, by focal series exit wave reconstruction (EWR), that C 2 F chair is a stable graphene derivative and demonstrates pristine long-range order limited only by the size of a functionalized domain. Focal series of images of graphene and C 2 F chair formed by reaction with XeF 2 were obtained at 80 kV in an aberration-corrected transmission electron microscope. EWR images reveal that single carbon atoms and carbon-fluorine pairs in C 2 F chair alternate strictly over domain sizes of at least 150 nm 2 with electron diffraction indicating ordered domains Z0.16 mm 2 . Our results also indicate that, within an ordered domain, functionalization occurs on one side only as theory predicts. In addition, we show that electron diffraction provides a quick and easy method for distinguishing between graphene, C 2 F chair and fully fluorinated stoichiometric CF 2D phases.

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confidence: 66%

Atomically resolved imaging of highly ordered alternating fluorinated graphene

et al. 2014

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“…Depending on the fluorination temperature, two types of graphite fluorides can be obtained: poly(dicarbon monofluoride) (C 2 F) n at 350°C and poly(carbon monofluoride) (CF) n at 600°C. These materials are characterized by a strong covalent C-F bond associated to a sp 3 hybridization of carbon atoms [6]. The tribological properties of such compounds strongly depend on various parameters and especially fluorine content and environmental atmosphere [3,4].…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Fluorinated Carbon Nanofibres

Pandorf¹,

Himmel²,

Mansot³

et al. 2009

Tribol Lett

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This work is concerned with the study of the tribological properties of fluorinated carbon nanofibres with various fluorination rates. The tribological tests, carried out in the presence of pentane and in air after liquid's evaporation demonstrate good friction properties for all the compounds (the friction coefficients ranging between 0.04 and 0.06 in the presence of pentane and between 0.07 and 0.09 in air). Raman analyses reveal that the friction process induces a partial deterioration of the carbon fibres and SEM studies show that the tribofilm is composed of individual fibres embedded in a more disordered carbonaceous matrix. The fibrous nature of the tribofilm and the experimental relationship between friction coefficient and fluorination rate strongly support that friction properties of fluorinated carbon nanofibres are governed by surface fibres interaction. The modification of the nanofibres surface tension by action of pentane or optimum fluorination rate leads to a lowering of interfibres interactions resulting in an improvement of the friction properties.

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“…Such compounds are characterized by puckered fluorocarbon layers (armchair conformation) associated to covalent C-F bonds. In these structures carbon atoms present a sp 3 hybridization [1]. These fluorinated compounds are used both as cathode materials in lithium batteries [2,3] and as solid lubricants [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Room Temperature Fluorinated Graphite Heat-Treated Under Fluorine Atmosphere

Delbé¹,

Pandorf²,

Himmel³

et al. 2009

Tribol Lett

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This work is concerned with the study of the tribologic properties of room temperature fluorinated graphite heat-treated under fluorine atmosphere. The fluorinated compounds all present good intrinsic friction properties (friction coefficient in the range 0.05-0.09). The tribologic performances are optimized if the materials present remaining graphitic domains (influenced by the presence of intercalated fluorinated species) whereas the perfluorinated compounds, where the fluorocarbon layers are corrugated (armchair configuration of the saturated carbon rings) present higher friction coefficients. Raman analyses reveal that the friction process induces severe changes in the materials structure especially the partial rebuilding of graphitic domains in the case of perfluorinated compounds which explains the improvement of l during the friction tests for these last materials.

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Chemical composition and crystal structure of graphite fluoride

Cited by 280 publications

References 19 publications

Atomically resolved imaging of highly ordered alternating fluorinated graphene

Atomically resolved imaging of highly ordered alternating fluorinated graphene

Tribological Properties of Fluorinated Carbon Nanofibres

Tribological Properties of Room Temperature Fluorinated Graphite Heat-Treated Under Fluorine Atmosphere

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