Scalable production of large single-layered graphenes by microwave exfoliation ‘in deionized water’

Single-layered graphenes with large sizes were produced by inserting solvent molecules between the graphene layers in graphite intercalation compounds (GICs) followed by direct microwave exfoliation ‘in a solvent’ to prevent re-aggregation. During the microwave exfoliation of GICs in deionized (DI)...

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Bibliographic Details
Published in:Carbon (New York) 2018-08, Vol.134, p.431-438
Main Authors: Kim, Hye-Rim, Lee, Sung-Hyun, Lee, Kun-Hong
Format: Article
Language:English
Subjects:
Acetone
Deionization
Dispersion
Ethanol
Exfoliation
Graphite
Intercalation compounds
Micrometers
Molecules
Studies
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Summary:Single-layered graphenes with large sizes were produced by inserting solvent molecules between the graphene layers in graphite intercalation compounds (GICs) followed by direct microwave exfoliation ‘in a solvent’ to prevent re-aggregation. During the microwave exfoliation of GICs in deionized (DI) water, single-layered graphenes were produced, and their lateral sizes ranged from several micrometers to several tens of micrometers. The entire process time was less than 2 h, and toxic compounds were not used. In the case of microwave exfoliation in acetone or ethanol, graphenes with a thickness of 3–6 nm were mainly produced rather than single-layered graphenes. In addition, when the produced graphenes were directly dispersed in DI water, the dispersed state was maintained for 2 days. This method is very advantageous for industrial scale-up. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2018.04.014