NOVELTY - Producing dispersible nano graphene or graphene oxide platelet material comprises: preparing graphite intercalation compound (GIC) or graphite oxide (GO) from laminar graphite material of artificial graphite, graphite fluoride, graphite fiber, carbon fiber, carbon nano-fiber, carbon nano-tube, mesophase carbon microbead or carbonaceous micro-sphere, soft carbon and/or hard carbon; exposing GIC or GO to first temperature for first period of time to give exfoliated graphite; and exposing exfoliated graphite to second temperature in protective atmosphere for second period of time.    USE - The process is useful to produce dispersible nano graphene or graphene oxide platelet material (claimed), i.e. nano graphene platelets, which are useful in e.g.: transparent electrodes for solar cells or flat panel displays; additives for battery and super capacitor electrodes; conductive nano-composite for electromagnetic wave interference shielding and static charge dissipation; and nano-composite in which the nano graphene platelets are formed into a thin film or paper or incorporated in a matrix material.    ADVANTAGE - The process: provides nano graphene platelet materials, which are highly conducting without having to go through a chemical reduction procedure; requires no further chemical reduction; obviates the need to transfer nano graphene platelet material to another reactor by allowing it to stay in the exfoliation reactor; burns or decomposes most of the impurities comprising those used originally for intercalation/oxidation of graphite, during the initial exfoliation procedure and, particularly, the de-oxygenation procedure (at higher temperatures), obviating the need for washing and rinsing the graphite oxide platelets; provides exfoliated graphite oxide platelets with high electrical conductivity, high solubility or dispersibility in water and many other organic solvents; and saves energy and time by conducting two operations (thermal exfoliation and de-oxygenation) in the same reactor.    DETAILED DESCRIPTION - Producing a dispersible nano graphene or graphene oxide platelet material comprises: preparing a graphite intercalation compound (GIC) or graphite oxide (GO) from a laminar graphite material comprising artificial graphite, graphite fluoride, graphite fiber, carbon fiber, carbon nano-fiber, carbon nano-tube, mesophase carbon microbead or carbonaceous micro-sphere, soft carbon and/or hard carbon; exposing GIC or GO to first temperature for first period of time to obtain exfoliated graphite; and exposing the exfoliated graphite to second temperature in protective atmosphere for second period of time to obtain the dispersible nano graphene platelet material with oxygen content of not greater than 25 wt.%.