Two-dimensional crystals of Graphene Oxide (GO) were synthesized by modified Hummers method: flakes of specific lateral size 1-2 μm were obtained as a stable aqueous suspension. The size of GO flakes can be controlled via initial graphite powder grain size as well as via respective filtration or centrifugation of the GO solution. The concentration of GO in the solution can be varied between 4 mg/mL and 0.005 mg/mL. The GO is highly hydrophilic material, has good solubility in water and forms therefore a stable colloidal solution. The obtained GO suspension can be used as an ink for printed electronics of graphene oxide.
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