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In the present work, the use of a commercial ionic liquid as a convenientsolvent medium for graphite exfoliation in mild and easy conditions without anychemical modification is presented. To confirm the presence of few layergraphene, its dispersion was charachterized by Raman spectroscopy, atomic forcemiscroscopy and field emission electron microscopy. From the UV-Vischaracterization, a graphene concentration as high as 2.543 mg/ml was obtained,which is the highest value reported so far in any solvent.Comment: This paper has been withdrawn by the author due to a revision  requested by the edito

High concentration few-layer graphene sheets obtained by liquid phase exfoliation of graphite in ionic liquid