Highly concentrated and stable few-layers graphene suspensions in pure and volatile organic solvents

• Easy procedure to prepare stable few-layers graphene suspensions in organic volatile solvents.
• Conductive glasses graphene coated with different levels of transparency.
• Few-layers graphene stable suspensions.
• Graphene coating of surfaces.
• Spray-on graphene suspensions.

Highly stable graphene suspensions in pure organic solvents, including volatile solvents such as ethanol, tetrahydrofurane, chloroform, acetone or toluene have been prepared by re-dispersion of a graphene-powder. Such re-dispersable solid is produced by precipitation or solvent elimination from graphene suspensions obtained by sonication of graphite in several organic solvent–water mixtures. Re-dispersion is feasible in a wide range of pure organic solvents, obtaining high quality few-layers graphene flakes stable in suspension for months. As a proof-of-concept, on-glass spray deposition of some of these suspensions, e.g. ethanol or tetrahydrofuran, results on electrically conductive transparent coatings. These results suggest industrial potential use of the scalable technology here developed to fabricate low-cost devices with many different potential applications.

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