▎ 摘　　要

NOVELTY - Graphene nanosheets have a polyaromatic hydrocarbon concentration of not less than 0.7 wt.%, and a tap density of not less than 0.08 g/cm3, as measured by ASTM B527-15 standard. Also, the graphene nanosheets have a Raman G/D ratio of greater than or equal to 2.5 and a 2D/G ratio of greater than or equal to 0.8, as measured using an incident laser wavelength of 514 nm. USE - The graphene nanosheets are useful for energy storage, filler and conductive ink applications. ADVANTAGE - The process can produce directly, using a plasma process, and without post-processing, graphene nanoplatelets containing very low levels of polyaromatic hydrocarbon. The graphene nanosheets do not require going through a liquid-phase or wet-chemistry process and thus display a lower tap density. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) removing volatile impurities from graphene nanosheets, which involves heating the graphene nanosheets under reactive atmosphere, at greater than or equal to 200 degrees C; (2) increasing the specific surface area (BET) of graphene nanosheets, which involves heating the graphene nanosheets under oxidative atmosphere, at greater than or equal to 200 degrees C; (3) dispersing graphene nanosheets in a solvent, which involves heating the graphene nanosheets under oxidative atmosphere, at greater than or equal to 200 degrees C and dispersing the graphene nanosheets in a solvent; (4) improving the electrical conductivity of graphene nanosheets, which involves heating the graphene nanosheets under oxidative atmosphere, at greater than or equal to 200 degrees C; and (5) a plasma process for producing graphene nanosheets which involves injecting into a thermal zone of a plasma, a carbon-containing substance at a velocity of greater than or equal to 60 m/s standard temperature and pressure (STP) to nucleate the graphene nanosheets, and quenching the graphene nanosheets with a quench gas of no not greater than 1000 degrees C, and further heating the graphene nanosheets under reactive atmosphere, at greater than or equal to 200 degrees C.