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US 9,114,405 B2Granted
Sorting two-dimensional nanomaterials by thickness
AssigneeNorthwestern University
InventorsAlexander A. Green, Mark C. Hersam
Life of this patent
Estimating the term…
Abstract
The Present teachings provide, in part, methods of separating two-dimensional nanomaterials by atomic layer thickness. In certain embodiments, the present teachings provide methods of generating graphene nanomaterials having a controlled number of atomic layer(s).
Claims16
A method for separating graphene nanomaterials by thickness, the method comprising:
- sonicating pristine graphite in a first fluid medium to provide a graphene composition;
- centrifuging the graphene composition in contact with an aqueous second fluid medium comprising a density gradient, wherein the graphene composition comprises one or more surface active components and a polydisperse population of graphene nanomaterials comprising monolayer graphene, bilayer graphene, trilayer graphene, and n-layer graphene, wherein n is an integer in the range of 4 to 10;
- and
- separating the graphene composition into two or more separation fractions each comprising a subpopulation of graphene nanomaterials from the polydisperse population, wherein the subpopulation in at least one of the two or more separation fractions comprises greater than 50% of monolayer graphene, bilayer graphene, trilayer graphene, or combinations thereof.
1 more element
A method for separating graphene nanomaterials by thickness, the method comprising:
- centrifuging a graphene composition in contact with an aqueous fluid medium comprising a density gradient, wherein the graphene composition comprises one or more surface active components and a polydisperse population of graphene nanomaterials comprising monolayer graphene, bilayer graphene, trilayer graphene, and n-layer graphene, wherein n is an integer in the range of 4 to 10;
- and
- separating the graphene composition into two or more separation fractions each comprising a subpopulation of graphene nanomaterials from the polydisperse population, wherein the subpopulation in at least one of the two or more separation fractions comprises greater than 50% of monolayer graphene, bilayer graphene, trilayer graphene, or combinations thereof.
A method for separating graphene nanomaterials by thickness, the method comprising:
- centrifuging a graphene composition in contact with an aqueous fluid medium comprising a density gradient, wherein the graphene composition comprises one or more surface active components comprising an amphiphilic compound comprising a planar organic group, and a polydisperse population of graphene nanomaterials comprising monolayer graphene, bilayer graphene, trilayer graphene, and n-layer graphene, wherein n is an integer in the range of 4 to 10;
- and
- separating the graphene composition into two or more separation fractions each comprising a subpopulation of graphene nanomaterials from the polydisperse population, wherein the subpopulation in at least one of the two or more separation fractions comprises greater than 50% of monolayer graphene, bilayer graphene, trilayer graphene, or combinations thereof.
Dependencies are inferred from the claim text.