Salting-out as a scalable, in-series purification method of graphene oxides from microsheets to quantum dots

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Chemically modified graphenes (CMGs) are used to reinforce composites and as platforms for sensing, electrodes in batteries, conductive films for displays, and others. However, performance of CMG materials is often limited by their physicochemical heterogeneity. Here, we report that simple addition of ammonium sulfate to heterogeneous CMG mixtures, results in effective, scalable, and in-series purification, by salting-out precipitation. The mechanism is based on differences in the dispersibility of the individual graphene oxide (GO). At relatively low ammonium sulfate concentrations (similar to 10 mM), large, GOs with pre-dominant hydrophobic domains are precipitated. As the salt concentration increases, smaller and less GOs with predominant hydrophobic domains are purified, and eventually graphene quantum dots (GQDs) are isolated. The method described herein was inspired by a well-known protein purification process called 'salting-out,' in which proteins of different sizes and surface charge, successively become indispersible over a narrow range of salt concentrations. The salting-out process for GOs is simple and scalable, and can be used to achieve large-scale purification. (c) 2013 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2013-11
Language
English
Article Type
Article
Keywords

GRAPHITE OXIDE; CONFORMATIONAL-CHANGES; SEPARATION; NANOSHEETS; ENZYMES; MUSCLE

Citation

CARBON, v.63, pp.45 - 53

ISSN
0008-6223
DOI
10.1016/j.carbon.2013.06.037
URI
http://hdl.handle.net/10203/187393
Appears in Collection
MS-Journal Papers(저널논문)CH-Journal Papers(저널논문)
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