Graphene: Patent Database

2009

Application: Large-Area Single- and Few-Layer Graphene on Arbitrary Substrates

Kong, Jing, Cecco, Alfonso Reina, Dresselhaus, Mildred S.

A film of single-layer to few-layer graphene is formed by depositing a graphene film via chemical vapor deposition on a surface of a growth substrate. The surface on which the graphene is deposited can be a polycrystalline nickel film, which is deposited by evaporation on a SiO2/Si substrate. A protective support layer is then coated on the graphene film to provide support for the graphene film and to maintain its integrity when it is removed from the growth substrate. The surface of the growth substrate is then etched to release the graphene film and the protective support layer from the growth substrate, wherein the protective support layer maintains the integrity of the graphene film during and after its release from the growth substrate. After being released from the growth substrate, the graphene film and protective support layer can be applied onto an arbitrary target substrate for evaluation or use in any of a wide variety of applications.

Filling Date 04/13/2009

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Application: REDUCED GRAPHENE OXIDE FILM

Robinson, Jeremy T. and Snow, Eric S.

Spin coating a mixture of graphene oxide platelets, water, and an organic solvent by placing a drop of the mixture on a spinning substrate while blowing a drying gas onto the substrate and allowing the water and the organic solvent on the substrate to evaporate; and repeating the spin coating one or more times to form a graphene oxide film in contact with the substrate. An about 1-100 nm thick film of overlapping platelets of reduced graphene oxide.

Filling Date: 02/06/2009

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Devices including graphene layers epitaxially grown on single crystal substrates

Pfeiffer, Loren Neil

An electronic device comprises a body including a single crystal region on a major surface of the body. The single crystal region has a hexagonal crystal lattice that is substantially lattice-matched to graphene, and a at least one epitaxial layer of graphene is disposed on the single crystal region. In a currently preferred embodiment, the single crystal region comprises multilayered hexagonal BN. A method of making such an electronic device comprises the steps of: (a) providing a body including a single crystal region on a major surface of the body. The single crystal region has a hexagonal crystal lattice that is substantially lattice-matched to graphene, and (b) epitaxially forming a at least one graphene layer on that region. In a currently preferred embodiment, step (a) further includes the steps of (a1) providing a single crystal substrate of graphite and (a2) epitaxially forming multilayered single crystal hexagonal BN on the substrate. The hexagonal BN layer has a surface region substantially lattice-matched to graphene, and step (b) includes epitaxially forming at least one graphene layer on the surface region of the hexagonal BN layer. Applications to FETs are described.

Publication Date: 11/17/2009

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2008:

Application: GRAPHENE SHEET AND METHOD OF PREPARING THE SAME

Choi, Jae-young Shin, Hyeon-jin Yoon, Seon-mi (Yongin-si, KR)

thickness includes forming a film, the film comprising a graphitizing catalyst; heat-treating a gaseous carbon source in the presence of the graphitizing catalyst to form graphene; and cooling the graphene to form a graphene sheet. A graphene sheet prepared according to the disclosed method is also described.

Filling Date 07/08/2008

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Application:MANUFACTURING A GRAPHENE DEVICE AND A GRAPHENE NANOSTRUCTURE SOLUTION

Hong, Seunghun, Koh, Juntae

echniques for manufacturing a graphene structure solution and a graphene device are provided. A uniform graphene nanostructure solution is produced by applying anisotropic etching on a multi-layered graphene using an oxide nanowire as a mask. A graphene device is manufactured by dipping a substrate with a pattern of a molecule layer in a graphene nanostructure solution so that graphenes are aligned on the substrate with the pattern.

Filling Date 09/15/2008

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2004

Application: Devices including graphene layers epitaxially grown on single crystal substrates

Deheer, Walt A., Berger, Claire, First, Phillip N.

In a method of making graphite devices, a preselected crystal face of a crystal is annealed to create a thin-film graphitic layer disposed against selected face. A preselected pattern is generated on the thin-film graphitic layer. A functional structure includes a crystalline substrate having a preselected crystal face. A thin-film graphitic layer is disposed on the preselected crystal face. The thin-film graphitic layer is patterned so as to define at least one functional structure.

Filling Date: 06/03/2004

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