Isothermal exfoliation of graphene oxide by a new carbon dioxide pressure swing method

Seul Yi Lee, Soo Jin Park

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46 Scopus citations

Abstract

Graphene oxide (GO) was prepared by a modified Hummers' method. GO was modified using a simple CO2 pressure swing technique to obtain exfoliated GO. The microcrystalline structures and morphologies were characterized using the X-ray diffraction and scanning electron microscope/transmission electron microscope measurements. The textural properties were investigated by N2 (77 K) adsorption/desorption isotherms. CO2 (298 K, 30 bar) and H2 (298 K, 100 bar) adsorption experiments were conducted to investigate their adsorption behaviors. The results indicated that the best sample had a specific surface area of 547 m2/g and total pore volume of 2.468 cm3/g. According to the results, CO2 pressure swing method can be used to increase the efficiency of exfoliation and expansion of the graphitic interlayers in GO.

Original languageEnglish
Pages (from-to)112-117
Number of pages6
JournalCarbon
Volume68
DOIs
StatePublished - Mar 2014

Bibliographical note

Funding Information:
This work was supported by the Korea CCS R&D Center (KCRC) grant funded by the Korea government ( 0031985 ).

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