Synthesis and Structural Characterization of Hydroxylated Graphene Based on Ozone Nanobubbles
To prepare hydroxylated graphene(G-OH),natural flake graphite was first treated with ultrasound in the presence of dispersant to obtain graphene via liquid phase stripping,which was subsequently oxidized with conventional ozone(O3)oxidation or ozone nanobubbles(O3NBs)generated by hydraulic cavitation.The structure,morphology,potential and spectroscopy of the samples were analyzed through atomic force microscopy,zeta potential,X-ray photoelectron spectroscopy and Raman spectroscopy.The results show that the thickness of the graphene flakes treated under these two oxidation modes is 3-4 nm;the functional groups on the surface of O3 oxidized graphene are similar to those of untreated graphene.Compared with O3,the oxidation efficiency of O3NBs is higher,and the O3NBs treated graphene has a greater degree of hydroxylation with the introduction of a small number of carbonyl groups on the aromatic ring of graphene,so that the G-OH prepared by O3NBs has both hydroxyl and carbonyl functions.
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