Synthesis and physical–chemical properties of hydrolyzed nanosized mesoporous fluorocarbon materials and carbon–fluorocarbon composites

Hydrolysis of nanosized mesoporous superstoichiometric fluorocarbon material FS (CF1.20 ± 0.03) and carbon–fluorocarbon nanocomposites NCFC (CF0.93 ± 0.03) by 10% KOH in aqueous-alcohol solution was studied and yielded two new classes of the hydrolyzed fluorocarbon nanomaterials: hydroxofluorocarbon nano-material FS–OH of general formula sp3-C1−yFn−x(OH)x (n = 1; x > 0.1, y ∼ 0.05–0.1) and carbon–hydroxofluorocarbon nanocomposites NCFC–OH of general formula sp2-Cm*sp3-C1−yFn−x(OH)x (n = 1; x ∼ 0; y ∼ 0.1–0.2).FTIR and Raman studies of FS–OH and NCFC–OH materials have shown that hydrolysis of sp3-C–F-bonds in these materials leads a decrease of sp3-C–F amount and appearance of characteristic absorption bands for sp3-C–OHO, carboxyls and carbonyls, typical for oxidized graphites, carbon blacks and various soots. These phenomena, in combination with C,H,F-analyses for FS–OH and NCFC–OH products have allowed to state that hydrolysis of FS and NCFC in KOH solutions can be explained by the substitution reactions of surface sp3-C–F to sp3-C–OH and sp2>CO containing groups.Observed hydrolytic reactions are also accompanied with processes of the colored solutions origin (yellow – for FS and red-brown – for NCFC). These solutions have UV-VIS spectra identical to graphene oxide and graphitic acid.

Two new classes of hydrolyzed fluorocarbon porous nanomaterials: hydroxoflurocarbon nanocomposite FS–OH of the general formula sp3-C1−yFn−x(OH)x (n = 1; x > 0.1, y ∼ 0.05–0.1) and carbon–hydroxoflurocarbon nanocomposite NCFC–OH of general formula sp2-Cm*sp3-C1−yFn−x(OH)x (n = 1; x ∼ 0; y ∼ 0.1–0.2).Figure optionsDownload as PowerPoint slideHighlights
► Hydrolysis of mesoporous superstoichiometric fluorocarbon material CF1.20 and carbon–fluorocarbon nanocomposites CF0.93.
► Substitution of sp3-C–F by sp3-C–OH and origin of colored solutions, having UV-VIS spectra identical to graphene oxide.
► Two novel classes of the hydrolyzed fluorocarbon nanomaterials.
► Hydroxofluorocarbons sp3-C1−yFn−x(OH)x (n = 1; x > 0.1, y ∼ 0.05–0.1). Carbon–hydroxofluorocarbon nanocomposites sp2-Cm*sp3–C1−yFn−x(OH)x (n = 1; x ∼ 0.1; y ∼ 0.1–0.2).