▎ 摘　　要

NOVELTY - The method comprises placing an expandable graphite within a chamber, applying vacuum to the chamber such that a vacuum pressure in the chamber is 10-1 to 10-7 mbar in the chamber, applying an electric current to induction heat the expandable graphite within the chamber under the vacuum to form an expanded graphite, exfoliating the expanded graphite in a solvent to form graphene nano-sheets dispersed in the solvent, and expanding the expandable graphite by 200-1000 vol.% volume within the chamber to form the expanded graphite. USE - The method is useful for making graphene nano-sheets (claimed) that is useful in a graphene product for transparent electrodes and semiconductors, nanocomposite materials, batteries, supercapacitors and hydrogen storage applications. ADVANTAGE - The method is capable of easily making the graphene nano-sheets with high purity and uniform thickness. DETAILED DESCRIPTION - The method comprises placing an expandable graphite within a chamber, applying vacuum to the chamber such that a vacuum pressure in the chamber is 10-1 to 10-7 mbar in the chamber, applying an electric current to induction heat the expandable graphite within the chamber under the vacuum to form an expanded graphite, exfoliating the expanded graphite in a solvent to form graphene nano-sheets dispersed in the solvent, and expanding the expandable graphite by 200-1000 vol.% volume within the chamber to form the expanded graphite. The expandable graphite is heated to a temperature of 500-1100 degrees C for a time length of 1 second to 5 minutes, and comprises an intercalation agent capable of producing thermal expansion. The intercalation agent comprises shalogens, alkali metals, sulfate, nitrate, acids, and/or metal halides. Each of the graphene nano-sheets is formed to have an average thickness of 0.3-15 nm. The step of exfoliating the expanded graphite comprises sonicating the expanded graphite to form the snore graphene nano-sheets in the solvent, and is carried out in a presence of a conjugated polymer. The method further comprises coating the graphene dispersion on a substrate to form a graphene-containing composite comprising the graphene nano-sheets (0.001-5 wt.%) dispersed in a matrix of the conjugated polymer. An INDEPENDENT CLAIM is included for a graphene nano-sheet.