Polymer science graphene Size Exclusion Chromatography Transition electron microscopy
Ronan J Smith, Paul J King, Christian Wirtz, Georg S Duesberg, Jonathan N Coleman, Lateral Size Selection of Surfactant-Stabilised Graphene Flakes using Size Exclusion Chromatography, Chemical Physics Letters, 531, 2012, 169 172
Chemical Physics Letters 531
Aqueous dispersions of graphene, stabilised by a surfactant, have been separated according to lateral flake size using size exclusion chromatography. Transition electron microscopy was used to characterise the flake size as a function of fraction number. While the stock dispersion had a mean lateral flake size of 0.6 μm, the separated fractions displayed clear size separation, with the second and fourteenth fractions displaying mean sizes of ∼1.2 and ∼0.5 microns respectively. Raman spectroscopy shows the flake D:G intensity ratio to scale inversely with the flake size indicating that any defects present are associated with flake edges rather than basal plane defects.
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