METHOD OF SYNTHESIS WITH JOULE FLASH HEATING AND ITS COMPOSITION Russian patent published in 2024 - IPC C01B32/19 B82Y30/00 

FIELD: nanotechnology.

SUBSTANCE: invention relates to synthesis of graphene as a result of Joule flash heating, and can be used for synthesis of composite and 2D materials. Voltage pulse is applied to a conductive carbon source with specific conductivity of more than 10⁻⁵ S/cm, which contains a carbon source material which is not graphene, as a result of which the conducting carbon source is heated by current, and the material of the carbon source is converted into graphene. Conductive carbon source can contain less than 50% graphene. Specific conductivity of carbon source material is less than 10⁻⁵ S/cm. Conductive carbon source may further include a conductive additive selected from anthracite coal, calcined petroleum coke, carbon nanotubes, graphene quantum dots, acetylene or carbon black, schungite, graphene or mixtures thereof. Carbon source material is selected from excrements, plastics, vinyl or condensation polymers, polymers growing by stepwise or chain growth mechanism, living polymers, rubber, humic acid, carbohydrates, rice powder, food wastes, food products, coal, organic material, coke, petroleum coke, oil, oil products, carbon from stripping non-carbon atoms from natural gas or oil or carbon dioxide, wood, cellulose, leaves, branches, grass, biomass, animal or fish remains, proteins and mixtures thereof. Synthesized graphene is turbostratic graphene. Movement of conducting carbon source and synthesized graphene can be performed continuously, synchronizing to apply voltage pulse to conducting carbon source. To form a composite material containing 0.001–10 wt.% of turbostratic graphene, it is combined with a second material, selected from concrete, cement, plastics, paints, coatings, foam, polyurethane, flooring, roofing, wood, plywood, metals, asphalt, metal oxides, carbon-carbon composites, fibers, films and combinations thereof. Bulk of the large-scale graphene material obtained using said method and having a mass of at least 1 g is turbostratic graphene.

EFFECT: invention enables to obtain low-defect turbostratic graphene in large-scale quantities.

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