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Effect of synthesis method on solvation and exfoliation of graphite oxide
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2013 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 52, 171-180 p.Article in journal (Refereed) Published
Abstract [en]

Graphite oxides (GOs) synthesized by Brodie’s and Hummers’ methods are significantly different with respect to hydration, solvation and exfoliation properties. Hummers GO is more easily intercalated by liquid water and alcohols, exhibiting osmotic type of swelling. In contrast, Brodie GO shows crystalline swelling in alcohol solvents with step-like insertion of methanol or ethanol monolayers. However, the stronger hydration and easier dispersion in water observed for Hummers GO do not correlate with better dispersion of graphene powder obtained by thermal exfoliation. Higher surface area graphene powder was obtained by exfoliation of Brodie GO, while the temperature of its exfoliation is about 75 C higher than that for the studied sample of Hummers GO. It is suggested that higher exfoliation temperature and better crystallinity of GO are important factors for preparation of graphene powder using thermal exfoliation.

Place, publisher, year, edition, pages
2013. Vol. 52, 171-180 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-61640DOI: 10.1016/j.carbon.2012.09.018OAI: oai:DiVA.org:umu-61640DiVA: diva2:571185
Available from: 2012-11-21 Created: 2012-11-21 Last updated: 2017-12-07Bibliographically approved

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