OBTAINING OF GRAPHENE OXIDE AND ITS CHEMICAL REDUCTION FOR SYNTHESIS OF AEROGELS
Keywords:
оксид графена,, восстановление,, аэрогель,, гидрогель,, графенAbstract
In this paper, the possibility of obtaining of graphene oxide from natural graphite via Modified Hummer’s method is shown. The obtained graphene oxide was studied by IR and Raman spectroscopy, as well as scanning electron microscopy. The resulting graphene oxide is the basic material for synthesis of threedimensional porous structures - aerogels. Synthesis of aerogels includes chemical reduction of graphene oxide at 95 °C, and during it the self-assembly of graphene layers by restoring the -OH groups localized on its surface into a three-dimensional structure – hydrogel is occurred. In its turn, the resulting hydrogel is freeezed in liquid nitrogen with formation of ice particles, which sublimating, are forming the pores of the aerogel. Parameters sublimation, such as temperature and pressure, significantly affect the structure of the formed sample. The optimal parameters of freeze-drying process were established as Temperature - -15 °C, Pressure - 30-50 Pa.References
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