Method for purifying graphene powder
AssigneeKorea Institute of Science and Technology
InventorsJae Kap Lee, Kyoung-Il Lee
Life of this patent
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Abstract
An easy and effective method for purifying graphene powder by removing magnetic impurities, wherein magnetic impurities are incorporated during the process of fabricating the graphene powder, is provided. The method for purifying graphene powder, the method including: (1) ball-milling a graphite material to form graphene powder; (2) dispersing the graphene powder in a solvent to form a suspension; and (3) separating magnetic impurities during stirring the suspension, by using a magnet, Wherein the magnetic impurities were incorporated into the graphene powder during ball-milling from the balls and dispersed in the suspension.
Claims9
A method for purifying graphene powder, the method including:
- (1) ball-milling a graphite material by using a stainless ball to form graphene powder to be a size of 100 nm or smaller;
- (2) dispersing the graphene powder in a solvent to form a suspension;
- and
- (3) separating magnetic impurities during stirring the suspension, by using a magnet, wherein the magnetic impurities were incorporated into the graphene powder during ball-milling from the balls and dispersed in the suspension,
- and wherein the dispersing in step (2), the stirring in step (3), or the dispersing and the stirring in step (2) and step (3) is performed by using ultrasonication.
A method for purifying graphene powder, the method including:
- (1) ball-milling a multi-walled tube-like graphite material having a helical form of a graphene ribbon to form graphene nano-powder by using a ball-milling apparatus with stainless balls with a diameter of 6 mm for two hours;
- (2) dispersing the graphene nano-powder in a solvent to form a suspension;
- (3) stirring the suspension, wherein magnetic impurities were incorporated into the graphene nano-powder during ball-milling from the balls and dispersed in the suspension;
- (4) placing a magnet in the suspension, wherein the magnetic impurities stick to the magnet.
Dependencies are inferred from the claim text.