# US 2014/0193575 A1 · Crystalline graphene and method of making crystalline graphene

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- Number: US 2014/0193575 A1
- Document ID: US20140193575A1
- Status: Published application
- Kind: A1
- Application number: 14/001,845
- Filed: 2011-12-06
- Published: 2014-07-10
- Earliest claimed: 2011-09-09
- Assignees: Board of Trustees of Northern Illinois University
- Inventors: Narayan S. Hosmane; Amartya Chakrabarti
- Web page: https://patentgrep.com/patent/US20140193575A1

## CPC

- C09D 11/52: Electrically conductive inks
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 32/184: Preparation
- C01B 32/196: Purification
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

A method of producing graphene comprises forming a composition comprising magnesium and carbon, and isolating graphene from the composition. The isolated graphene is crystalline.

## Claims

### Claim 1

(canceled)

### Claim 2

A method of producing isolated graphene, comprising isolating graphene from a composition comprising graphene and magnesium.

### Claim 3 (depends on 2)

The method of claim 2, wherein forming the composition comprises burning magnesium metal in an atmosphere comprising carbon dioxide.

### Claim 4 (depends on 2)

The method of claim 2, wherein the composition is formed in contact with solid carbon dioxide.

### Claim 5 (depends on 2)

The method of claim 2, wherein forming the composition comprises reducing a carbon dioxide with magnesium metal.

### Claim 6 (depends on 2)

The method of claim 2, wherein forming the composition comprises producing molten metal comprising the magnesium.

### Claim 7 (depends on 2)

The method of claim 2, wherein the composition further comprises at least one additional element.

### Claim 8 (depends on 7)

The method of claim 7, wherein the at least one additional element comprises zinc.

### Claim 9

(canceled)

### Claim 10 (depends on 2)

The method of claim 2, wherein the isolating comprises removing from the graphene at least one of magnesium oxide, magnesium metal and carbon.

### Claim 11 (depends on 10)

The method of claim 10, wherein the removing comprises washing with an aqueous solution of an acid, and filtering, to produce a filtrate comprising the graphene.

### Claim 12

(canceled)

### Claim 13 (depends on 2)

The method of claim 2, wherein the filtrate comprises graphene having an average particle diameter of at most 300 nm.

### Claim at position 14

14-15. (canceled)

### Claim 16 (depends on 2)

The method of claim 2, wherein the graphene is few-layer graphene.

### Claim 17 (depends on 2)

Isolated crystalline graphene, prepare by the method of claim 2.

### Claim 18

Isolated crystalline graphene.

### Claim 19 (depends on 18)

The isolated crystalline graphene of claim 18, wherein the graphene is few-layer graphene.

### Claim 20 (depends on 18)

The isolated crystalline graphene of claim 18, wherein an X-ray diffraction pattern under CuKα radiation of the isolated crystalline graphene has a (100) peak with a full-width at half-maximum intensity which is at most 150% of the full-width at half-maximum intensity of the (100) peak illustrated in FIG. 7.

### Claim 21

(canceled)

### Claim 22

The isolated crystalline graphene of any one of the preceding claims, wherein the crystalline graphene has an average particle size of at most 500 nm.

### Claim at position 22

23-26. (canceled)

### Claim 27 (depends on 18)

A method of forming a graphene ink, comprising dispersing or suspending the isolated crystalline graphene of claim 18 into a liquid.

### Claim at position 24

28-29. (canceled)

### Claim 30 (depends on 27)

A graphene ink, prepared by the method of claim 27.

### Claim 31

A graphene ink, comprising crystalline graphene and a liquid.

### Claim at position 27

32-33. (canceled)

### Claim 34 (depends on 18)

A method of preparing an electronic device, comprising preparing the electronic device from the isolated crystalline graphene claim 18.

### Claim 35 (depends on 31)

A method of preparing an electronic device, comprising preparing the electronic device from the graphene ink of claim 31.

### Claim 36 (depends on 35)

The method of claim 35, wherein the preparing comprises printing the graphene ink on a substrate.

### Claim at position 31

37-40. (canceled)