Geodesic
Synthesis of graphene nanoplatelets from peroxosulfate graphite intercalation compounds
Nanosistemy: fizika, himiâ, matematika, Tome 5 (2014) no. 2, pp. 294-306.

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Ultrasonic exfoliation of expanded graphite compound obtained by cold expansion of graphite intercalated with peroxodisulfuric acid was shown to allow the creation of graphene nanoplatelets with thickness of about 5 – 10 nm. The resulting graphene material contained surface oxide groups. The expanded graphite intercalation compound was exfoliated by ultrasound much easier than thermally expanded graphite. A mechanism for the cleavage of graphite to graphene nanoplatelets is proposed. It includes: (1) formation of ionic graphite compound intercalated with peroxodisulfate anions; (2) decomposition of intercalated peroxodisulfate anions with formation of active free radicals which (3) attach covalently to carbon atoms; (4) cleavage and expansion of the graphite crystal due to the thickening of the peripheral region of graphene layers and release of gaseous oxygen between graphene layers; (5) hydrolysis of the expanded graphite compound; and, finally, (6) ultrasonic breaking of graphene nanoplatelet agglomerates.
Keywords: peroxodisulfuric acid, graphite intercalation compounds, cold expansion.
Mots-clés : graphene, graphene nanoplatelets 
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     author = {A. V. Melezhyk and A. G. Tkachev},
     title = {Synthesis of graphene nanoplatelets from peroxosulfate graphite intercalation compounds},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {294--306},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2014_5_2_a5/}
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A. V. Melezhyk; A. G. Tkachev. Synthesis of graphene nanoplatelets from peroxosulfate graphite intercalation compounds. Nanosistemy: fizika, himiâ, matematika, Tome 5 (2014) no. 2, pp. 294-306. http://geodesic.mathdoc.fr/item/NANO_2014_5_2_a5/