Solution phase production of graphene with controlled thickness via density differentiation.

By A. Green, Mark C. Hersam. Nano letters (Print), 2009

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Inkjet-printed graphene electronics. (2011, background): “Bile salt surfactants also allow the isolation of flakes with controlled thickness, when combined with density gradient ultracentrifugation.(61) Exfoliation of graphite-intercalated compounds(58) and expandable graphite(62) was also reported.”
High-concentration, surfactant-stabilized graphene dispersions. (2010, background): “They observed typical flake (lateral) sizes of 100 nm with maximum sizes of 250 nm.(24) Defect Content.”
Polymer-stabilized graphene dispersions at high concentrations in organic solvents for nanocomposite production (2011, background): “3 Studies of pristine graphene dispersion (without oxidation) have largely focused on aqueous solutions, where graphite may be sonicated in the presence of surfactants such as sodium chlorate or sodium dodecyl benzene sulfonate (SDBS) [18-27].”