Reductive-expansion synthesis of graphene
AssigneeStc.Unm
InventorsClaudia Catalina Luhrs, Jonathan Phillips
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Abstract
Exemplary embodiments provide materials and methods for forming graphene-based exfoliated products with low oxygen contents by a reductive-expansion reaction from a physical mixture containing graphite-based precursor(s) and a chemical agent. Exemplary embodiments also provide materials and methods for forming graphene-based exfoliated products with controllable amounts of nitrogen and/or other impurities incorporated in the material structure as a result of a reductive-expansion reaction from a physical mixture containing graphite-based precursor(s) and a chemical agent.
Claims20
A method of forming a graphene-based product comprising:
- forming a solid phase, physical mixture comprising one or more graphite-based precursors and one or more solid phase reduction-expansion chemical agents selected from the group consisting of urea [(NH2)2CO] and thiourea [SC(NH2)2], wherein each of the one or more graphite-based precursors comprises one or more of a graphite oxide, an expandable graphite, and a combination thereof;
- and
- heating the physical mixture in an inert atmosphere at a temperature sufficient to thermally decompose the solid phase reduction-expansion chemical agent to produce a reducing gas and form a graphene-based product comprising one or more of a single graphene sheet, a stack of two or more single graphene sheets, entangled single graphene sheets, and combinations thereof.
A method of forming a graphene-based product comprising:
- forming a physical mixture by physically mixing graphite oxide with a reductive-expansion agent comprising urea;
- heating the physical mixture in an inert atmosphere at a heating temperature to form a free-standing graphene-based product, wherein the heating temperature is at or above a decomposition temperature of the reductive-expansion agent;
- and
- cooling the free-standing graphene-based product, wherein the graphene-based product comprises one or more of a single graphene sheet, a stack of two or more single graphene sheets, and entangled single graphene sheets.
A method of forming free standing graphene comprising:
- forming a physical mixture by physically mixing graphite oxide with a reductive-expansion agent comprising urea;
- heating the physical mixture in an inert atmosphere at a heating temperature to form free standing graphene, wherein the heating temperature is at or above a decomposition temperature of the reductive-expansion agent;
- and
- cooling the free-standing graphene, wherein the free standing graphene comprises graphene sheets.
Dependencies are inferred from the claim text.