“…The volatile fluorides MF n used are BF 3 and ClF 3 , leading to the fluorinated materials noted B and C, respectively. The reaction time is 14 h. The synthesis method is precisely described elsewhere [14,15]. The compounds are then treated under fluorine atmosphere at temperatures, noted T FPT , ranging from 150 to 600°C leading to two series of compounds, named B(T FPT ) and C(T FPT ).…”
Section: Methodsmentioning
confidence: 99%
“…The evaluation of this weight uptake attributed to fluorine allows us to determine the stoichiometry of the compounds and consequently the F/C ratio. The structural characterization reveals that the compounds obtained at room temperature are stage 1 GICs in which fluorine but also MF n and HF n species are intercalated between the graphene sheets [14,15]. The thermal post-treatment under fluorine atmosphere of the GICs obtained at room temperature will induce important structure evolutions depending on T FPT .…”
Section: Structural Evolution Of Fluorinated Graphite As a Function Omentioning
confidence: 97%
“…4 and 5, respectively in the wave number range 1000-1800 cm -1 . The solid lines shown at 1350 and 1580 cm -1 indicate the position of the Raman bands corresponding to the D and G bands classically observed in the Table 2 Evolution of the fluorine content (expressed as atomic F/C ratio determined from weight uptake [14,15]) and interlayer spacing (deduced from XRD patterns [14,15]) as a function of fluorination post-treatment temperature T FPT for B (synthesized with F 2 -HF-BF 3 gaseous mixture) and C (synthesized with F 2 -HF-ClF x gaseous mixture) series Raman spectrum of graphite [18][19][20]. The G band is attributed to the optical E 2g mode of the carbon atoms and the D mode is associated to disorder.…”
Section: Intrinsic Tribologic Properties Of Graphite Fluoridesmentioning
confidence: 99%
“…Recently, graphite fluorides obtained at room temperature by the reaction of graphite with gaseous F 2 , HF, and MF n mixture (the volatile fluorides MF n used were IF 5 , BF 3 , and ClF 3 ) have been treated under fluorine at temperatures between 100 and 600°C [11][12][13][14][15]. The coexistence of sp 2 and sp 3 carbon atoms confers to these materials interesting electrochemical properties for primary lithium batteries [16].…”
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.
“…The volatile fluorides MF n used are BF 3 and ClF 3 , leading to the fluorinated materials noted B and C, respectively. The reaction time is 14 h. The synthesis method is precisely described elsewhere [14,15]. The compounds are then treated under fluorine atmosphere at temperatures, noted T FPT , ranging from 150 to 600°C leading to two series of compounds, named B(T FPT ) and C(T FPT ).…”
Section: Methodsmentioning
confidence: 99%
“…The evaluation of this weight uptake attributed to fluorine allows us to determine the stoichiometry of the compounds and consequently the F/C ratio. The structural characterization reveals that the compounds obtained at room temperature are stage 1 GICs in which fluorine but also MF n and HF n species are intercalated between the graphene sheets [14,15]. The thermal post-treatment under fluorine atmosphere of the GICs obtained at room temperature will induce important structure evolutions depending on T FPT .…”
Section: Structural Evolution Of Fluorinated Graphite As a Function Omentioning
confidence: 97%
“…4 and 5, respectively in the wave number range 1000-1800 cm -1 . The solid lines shown at 1350 and 1580 cm -1 indicate the position of the Raman bands corresponding to the D and G bands classically observed in the Table 2 Evolution of the fluorine content (expressed as atomic F/C ratio determined from weight uptake [14,15]) and interlayer spacing (deduced from XRD patterns [14,15]) as a function of fluorination post-treatment temperature T FPT for B (synthesized with F 2 -HF-BF 3 gaseous mixture) and C (synthesized with F 2 -HF-ClF x gaseous mixture) series Raman spectrum of graphite [18][19][20]. The G band is attributed to the optical E 2g mode of the carbon atoms and the D mode is associated to disorder.…”
Section: Intrinsic Tribologic Properties Of Graphite Fluoridesmentioning
confidence: 99%
“…Recently, graphite fluorides obtained at room temperature by the reaction of graphite with gaseous F 2 , HF, and MF n mixture (the volatile fluorides MF n used were IF 5 , BF 3 , and ClF 3 ) have been treated under fluorine at temperatures between 100 and 600°C [11][12][13][14][15]. The coexistence of sp 2 and sp 3 carbon atoms confers to these materials interesting electrochemical properties for primary lithium batteries [16].…”
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.
“…Recently, graphite fluorides were obtained at room temperature by reaction of graphite with gaseous fluorine in the presence of HF and volatile fluoride MF n (IF 5 , BF 3 ) as catalysts [7][8][9]. In these materials, the nature of the C-F bond evolves from semi-ionic (sp 2 hybridization of carbon atoms) to covalent (sp 3 hybridization of carbon atoms) depending on the synthesis conditions.…”
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.
Pyrolytic carbon (PyC) coating is deposited on IG‐110 nuclear graphite to protect it against the impregnation of molten Flinak salt. Raman spectroscopy, near‐edge X‐ray absorption fine structure (NEXAFS) spectroscopy, and X‐ray photoelectron spectroscopy (XPS) are used to investigate the effect of defects induced by 12C+ ion irradiation on the fluorination of PyC coating in Flinak salt. Results show evidence for the formation of CF bond. And the defects induced by ion irradiation facilitate the fluorination of PyC coating in Flinak salt.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.