Soluble graphene nanostructures and assemblies therefrom
AssigneeIndiana University Research and Technology Corporation
InventorsLiang-shi LI, Xin YAN
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Abstract
Disclosed herein is a method for preparing large soluble graphenes. The method comprises attaching one or more hindering groups to the graphene, which can prevent face-to-face graphene stacking by reducing the effects of inter-graphene attraction. The large graphenes can absorb a wide spectrum of light from UV to near infrared, and are useful in photovoltaic devices and sensitizers in nanocrystalline solar cells.
Claims40
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A composition comprising a population of graphene quantum dots, wherein a quantum dot comprises graphene, a first solubilizing group, and a first binding group.
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A composition of the formula, Y—(R)n, wherein Y is a polycyclic aromatic group, Rn is a first to an nth solubilizing group, wherein n is 1, 2, 3, 4, 5, or 6.
A composition of the formula, (A)m-Y—(R)n, wherein
- Y is a polycyclic aromatic group,
- (R)n is a first to an nth solubilizing group,
- (A)m is a first to an mth binding group,
- n is equal to 1, 2, 3, 4, 5, or 6, and
- m is equal to 1, 2, 3, 4, 5, or 6.
A nanostructure assembly of graphene quantum dots comprising an inorganic substrate and a population of graphene quantum dots, wherein
- (a) the graphene quantum dots have a sheet structure having a first face and a second face that is a monolayer in thickness, a length of from about 1 nanometer to about 4 nanometers and a width of from about 0.5 nanometers to about 5 nanometers,
- (b) the graphene quantum dots include a solubilizing group that is covalently bound to the edge of the sheet structure, and
- (c) the solubilizing group solubilizes and prevents aggregation of the graphene quantum dots extending from the edge in at least two directions to partially encapsulate the first face and the second face of the sheet structure.
A method of producing a soluble graphene quantum dot, the method comprising oxidizing a solubilized polyphenylene dendrimeric precursor.
Dependencies are inferred from the claim text.