Electrochemical Synthesis of Carbon Fluorooxide Nanoparticles from 3C-SiC Substrates

Abstract

Chemical nature of products, formed during electrochemical dissolution of polycrystalline 3C-SiC substrate in HF:ethanol mixture, was studied by means of FTIR spectroscopy, temperature-programmed desorption mass-spectrometry (TPD-MS), nanoparticles (NPs) with sizes of 1 -10 nm is described. CFO NPs easily dissolves in polar organic solvents (ethanol, CH 2 Cl 2 , etc); their solutions demonstrate intense yellowish-green photoluminescence under UV excitation. A model of the CFO chemical structure based on relatively small graphene domains interconnected with partially fluorinated hydrocarbon groups and terminated by carboxylic acid (-CO 2 H), ethyl ester (-CO 2 C 2 H 5 ), perfluorinated functional groups and polycarboxylated alkyl chains is proposed. Presence of carboxylates allows easy functionalization of the CFO NPs via amide chemistry. In particular, grafting of octadecyl groups makes CFO NPs soluble in hydrocarbons.

Superior Fischer-Tropsch performance of uniform cobalt nanoparticles deposited into mesoporous SiC

“…1 g of powder. Before characterization and Co NPs intercalation, the porous SiC samples were annealed at 500°C for 1 h in air to remove the carbon-enriched surface layer and any traces of carbon fluorooxide [31,32]. More detailed information can be found in Ref.…”

Synthesis of Fluorine‐Doped Hydrophilic Carbon Nanoparticles from Hexafluorobenzene by Femtosecond Laser Pulses

“…[12,[14][15] Panomsuwan et al reported the incorporation of fluorine (F/C = 0.05 on surface) in CNPs by solutionp lasma in C 6 H 5 CF 3 ; [14] the affinity of these CNPs to water was not mentioned. [12,[14][15] Panomsuwan et al reported the incorporation of fluorine (F/C = 0.05 on surface) in CNPs by solutionp lasma in C 6 H 5 CF 3 ; [14] the affinity of these CNPs to water was not mentioned.…”

“…[2] Basically,h igh fluorine doping is accomplished under severe synthetic conditions using very reactive reagents such as F 2 and HF. [2][3][4][5]12] Furthermore, the production of hydrophilic carbon materials also requires long-term oxidative acid treatments with heating to in-troduceO Ha nd/or COOH groups to the surface. [13] The addition of hydrophilic functional groups to the highly fluorinated carbons, such as carbon blacks (F/C = 0.89 [3] )a nd graphite (F/C = 0.83 [2] ), would not be useful under acidic conditions due to the liberationo ff luorine atoms.…”

“…Then eed for simpler synthetic methods for the simultaneous functionalization of both fluorine incorporation and hydrophilicity in carbonm aterials is important for broader application of nanocarbon materials.In 2015, the different synthetic methods of fluorinated carbon nanoparticles (CNPs) were reported. [12,[14][15] Panomsuwan et al reported the incorporation of fluorine (F/C = 0.05 on surface) in CNPs by solutionp lasma in C 6 H 5 CF 3 ; [14] the affinity of these CNPs to water was not mentioned. Alekseev et al carried out an electrochemical synthesis of carbon fluorooxide nanoparticles (F/C = 0.19 in whole particles), whichw ere dispersed in water after the hydrolysis of their ester groups in aqueous NaOH solution.…”

“…Alekseev et al carried out an electrochemical synthesis of carbon fluorooxide nanoparticles (F/C = 0.19 in whole particles), whichw ere dispersed in water after the hydrolysis of their ester groups in aqueous NaOH solution. [12] On the other hand, Lyth et al reported the solvothermals ynthesis of superhydrophobic NaFencapsulated fluorinated CNPs (F/C = 0.23 on surface;F /C = 0.028 in whole particles) from fluorinated alcoholt reated with sodiuma te levated temperatures. [15] The oppositea ffinity to water deduced from the latter two reports,i ndependento ft he fluorine content, are indicated by the presenceo ra bsence of hydrophilic OH and/or COOH groups on the surfaceo ft he CNPs.Herein we reportasimple procedure to synthesize fluorinedoped( F/C > 0.3) hydrophilic CNPs from hexafluorobenzene (HFB) facilitated by the solvatede lectrons that femtosecond laser pulses generate.…”