# US 2014/0196841 A1 · Copper foil for producing graphene and method of producing graphene using the same

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- Number: US 2014/0196841 A1
- Document ID: US20140196841A1
- Status: Published application
- Kind: A1
- Application number: 14/122,942
- Filed: 2012-04-09
- Published: 2014-07-17
- Earliest claimed: 2011-06-02
- Assignees: JX Nippon Mining & Metals Corporation
- Inventors: Yoshihiro Chiba; Tatsuya Yamaji
- Web page: https://patentgrep.com/patent/US20140196841A1

## CPC

- C01B 32/186: by chemical vapour deposition [CVD]
- B01J 23/72: Copper
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C22C 9/00: Alloys based on copper
- C22C 9/02: with tin as the next major constituent
- C22F 1/08: of copper or alloys based thereon
- Y10T 428/12431: Foil or filament smaller than 6 mils
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A copper foil for producing graphene, including oxides and sulfides each having a diameter of 0.5 μm or more having a total number of 15/mm2 or less measured by using a scanning electronic microscope before heating at 1000° C. for 1 hour.

## Claims

### Claim 1

A copper foil for producing graphene, including oxides and sulfides each having a diameter of 0.5 μm or more having a total number of 15/mm2 or less measured by using a scanning electronic microscope before heating at 1000° C. for 1 hour.

### Claim 2

A copper foil for producing graphene, including oxides and sulfides each having a diameter of 0.5 μm or more having a total number of 100/mm2 or less measured for an area having a total area of 3 mm2 within a depth of 10 μm from a surface that is a cross-section in parallel to a rolling direction by using a scanning electronic microscope before heating at 1000° C. for 1 hour.

### Claim 3

A copper foil for producing graphene, having a number of a dent portion being 20/mm2 or less, the dent portion having a depth ds of 1.5 μm or more being countered; ds=DS−DM; where DM is a lowest height by measuring 1 mm2 surface by using a confocal microscope and by each height profile of a granular part surrounded by a contour in the two dimensional image of the surface obtained; the 1 mm2 surface being heated at 1000° C. for 1 hour, and DS is a highest height that is regarded as a base line in an area of ±25 μm along a plane direction and a rolling direction from the position of DM.

### Claim 4

A copper foil for producing graphene, having a number of a convex portion being 100/mm2 or less, the convex portion having a height dt of 1.5 μm or more being countered; dt=HM−HS; where HM is a highest height by measuring 1 mm2 surface by using a confocal microscope and by each height profile of a granular part surrounded by a contour in the two dimensional image of the surface obtained; the 1 mm2 surface being heated at 1000° C. for 1 hour, and HS is a lowest height that is regarded as a base line in an area of ±25 μm in a plane direction and a rolling direction from the position of HM.

### Claim 5 (depends on 1)

The copper foil for producing graphene according to claim 1, wherein a purity of Cu is 99.95 to 99.995% by mass.

### Claim 6 (depends on 1)

The copper foil for producing graphene according to claim 1, consisting of tough pitch copper in accordance with JIS-H3100, or consisting of oxygen free copper in accordance with JIS-H3100, or containing 0.050% by mass or less of one or more of elements selected from the group consisting of Sn and Ag to the tough pitch copper or the oxygen free copper.

### Claim 7 (depends on 1)

A method of producing grapheme using the copper foil for producing graphene according to claim 1, comprising the steps of:
providing a carbon-containing gas while placing the heated copper foil to form graphene on a surface of the copper foil for producing graphene;
laminating a transfer sheet on the surface of the graphene, and etching and removing the copper foil for producing graphene while transferring the graphene to the transfer sheet.