▎ 摘　　要

NOVELTY - Preparing expanded graphite, comprises (a) placing expandable graphite in a chamber, (b) applying vacuum to the chamber, and (c) applying electric current for induction heating of the expandable graphite in vacuum, to form expanded graphite. USE - The method is useful in producing a graphene product (claimed). ADVANTAGE - The graphene product comprises the graphene nano-sheets having high purity and uniform thickness. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing a graphene product, comprising placing the expandable graphite in a chamber, where the expandable graphite comprises an intercalating agent which causes a thermal expansion, steps (b) and (c), and flaking the expanded graphite in a solvent to form graphene nano-sheets dispersed in the solvent.