Size selection of dispersed, exfoliated graphene flakes by controlled centrifugation
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Umar Khan, Arlene O'Neill, Harshit Porwal, Peter May, Khalid Nawaz, Jonathan N. Coleman, Size selection of dispersed, exfoliated graphene flakes by controlled centrifugation, Carbon, 50, 2, 2012, 470-475Download Item:
Size selection of dispersed, exfoliated graphene flakes by controlled centrifugation.pdf (Published (author's copy) - Peer Reviewed) 1.230Mb
Abstract:
Liquid exfoliation of graphene generally results in flakes with lateral size of one micron or less on average, too small for many applications. In this paper we describe a method to separate an existing dispersion with mean flake length of ~1 ?m into fractions, each with different mean flake size. The initial dispersion is centrifuged at a high centrifugation rate, separating small flakes in the supernatant from large flakes in the sediment. Redispersion of the sediment, followed by successive centrifugation, separation and redispersion cycles can be used to separate the flakes by size so long as the centrifugation rate is decreased with each cycle. This procedure results in a range of dispersions with mean flake length varying from 1 ?m for the highest final centrifugation rate to 3.5 ?m for the sample whose final centrifugation rate was 500 rpm.
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Grant Number
Science Foundation Ireland (SFI)
07/IN.7/I1772
Irish Research Council for Science and Engineering Technology (IRCSET)
Author's Homepage:
http://people.tcd.ie/colemajhttp://people.tcd.ie/ukhan
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PUBLISHEDSponsor:
Science Foundation Ireland (SFI)Irish Research Council for Science and Engineering Technology (IRCSET)
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Carbon50
2
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Nanoscience & MaterialsThe following license files are associated with this item: