TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method further comprises (c) separating the reducing agent precursor compound and its reaction products from the reduced graphene oxide by evaporation. The reduction is: performed in the aqueous medium containing water saturated with carbon dioxide and 1-10 mM of formate; and carried out by the electron beam irradiation at a dose of 5-30 kGy, preferably 25-30 kGy and by UV-radiation having a wavelength of 200-320 nm. The reduction is carried out for a time period of 1-30 minutes, preferably 2-20 minutes at a temperature of 5-95 degrees C, preferably room temperature. In the method, the liquid phase is evaporated. The aqueous medium further comprises a precursor compound, which forms non-reducing radicals when irradiated in the step (b), where the non-reducing radical form a covalent bond with the reduced graphene oxide. The further precursor compound is added to the aqueous medium after the reduction step. At least one additive, which enhances the dispersion stability of the reduced graphene in the aqueous/organic medium is added to the aqueous medium before or after irradiation. Preferred Components: The aqueous medium has a pH-value of 3-11, preferably 3-7, and does not comprise pH-controller or buffer substances. The reduced graphene oxide has carbon/oxygen ratio of at least 10, preferably greater that 13 and/or a surface resistivity of more than 104 to 105 Omega /square. The aqueous medium is in a gas atmosphere comprising carbon dioxide, nitrogen, nitrous oxide and/or air, or is saturated with a gas containing carbon dioxide, nitrogen, nitrous oxide and/or air.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The reducing agent precursor compound comprises: carbon dioxide; alcohols, preferably 1-10C monohydric or polyhydric alcohol including isopropanol, ethylene glycol or glycerol; aldehydes; 1-10C-carboxylic acids, preferably formate; and ketones, preferably acetone. The reducing agent precursor compound(s) is/are present in an amount of less than 5 wt.%, preferably 0.1-0.5 wt.% in the aqueous medium. The organic reducing agent precursor compound comprises a combination of acetone/isopropyl alcohol at a concentration of 0.01-1 wt.% of acetone and 0.5-8 wt.%, preferably 1-5 wt.% of isopropanol.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The dispersion-stabilizing additive consists of polyvinyl pyrrolidones, polyacrylic acids and their salts, and surfactants. EXAMPLE - No suitable example given.