# US 2013/0251998 A1 · Graphene-Coated Steel Sheet, and Method for Manufacturing Same

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- Number: US 2013/0251998 A1
- Document ID: US20130251998A1
- Status: Published application
- Kind: A1
- Application number: 13/824,591
- Filed: 2011-11-09
- Published: 2013-09-26
- Earliest claimed: 2010-11-09
- Assignees: Postech Academy-Industry Foundation; Posco
- Inventors: Chan Cuk Hwang; Yong Gyun Jung; Han Na Hwang; Jae In Jeong; Ji Hoon Yang
- Web page: https://patentgrep.com/patent/US20130251998A1

## CPC

- C23C 16/26: Deposition of carbon only
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 32/186: by chemical vapour deposition [CVD]
- C21D 1/68: Temporary coatings or embedding materials applied before or during heat treatment
- C21D 1/72: during chemical change of surfaces
- C21D 3/04: Decarburising
- C21D 8/0284: {Application of a separating or insulating coating}
- C21D 8/0484: {Application of a separating or insulating coating}
- C23C 8/22: of ferrous surfaces
- C23C 14/022: {by means of bombardment with energetic particles or radiation}
- C23C 14/0605: {Carbon}
- C23C 16/02: Pretreatment of the material to be coated (C23C16/04 takes precedence)
- C23C 16/487: {using electron radiation}
- Y10T 428/30: Self-sustaining carbon mass or layer with impregnant or other layer
- Y10T 428/31678: Of metal
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- 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}
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (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; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A graphene-coated steel sheet and a method for manufacturing the same are provided. The graphene-coated steel sheet includes a steel sheet and a graphene layer formed on the steel sheet. Therefore, the graphene-coated steel sheet can be useful in preventing corrosion of iron, such as oxidation of iron, and has remarkably excellent thermal conductivity and electrical conductivity, as well as excellent heat resistance resulting from thermal stability of graphene. Also, the method can be useful in manufacturing a high-quality graphene-coated steel sheet having a monocrystalline form and showing substantially no defects or impurities.

## Claims

### Claim 1

A graphene-coated steel sheet comprising:
a steel sheet; and
a graphene layer formed on the steel sheet.

### Claim 2 (depends on 1)

The graphene-coated steel sheet of claim 1, which satisfies the following Expression 1:
X≦1.5 eV Expression 1
wherein X represents a full width at half maximum (FWHM) of graphene included in the steel sheet on the 1S core level spectra of carbon (C) as measured using a high-resolution photoelectron spectrometer (HRPES).

### Claim 3 (depends on 2)

The graphene-coated steel sheet of claim 2, wherein X is equal to or less than 0.8 eV.

### Claim 4 (depends on 1)

The graphene-coated steel sheet of claim 1, wherein a graphene domain of the graphene layer has two dominant domain directions.

### Claim 5 (depends on 1)

The graphene-coated steel sheet of claim 1, wherein the graphene domain of the graphene layer has an average diameter of 200 Å or more.

### Claim 6 (depends on 5)

The graphene-coated steel sheet of claim 5, wherein the graphene domain of the graphene layer has an average diameter of 300 Å to 1,000 Å.

### Claim 7 (depends on 1)

The graphene-coated steel sheet of claim 1, wherein the graphene layer is formed in a single-layer or multilayered structure.

### Claim 8 (depends on 7)

The graphene-coated steel sheet of claim 7, wherein the multilayered structure is composed of 2 to 10 layers.

### Claim 9 (depends on 1)

The graphene-coated steel sheet of claim 1, wherein the graphene domain of the graphene layer is a monocrystalline or polycrystalline form.

### Claim 10 (depends on 1)

The graphene-coated steel sheet of claim 1, wherein carbon (C) remaining in the interface between the steel sheet and the graphene layer is present at a content of 15 parts by weight or less, based on 100 parts by weight of the carbon included in the single graphene layer.

### Claim 11 (depends on 1)

The graphene-coated steel sheet of claim 1, wherein sulfur (S) remaining in the interface between the steel sheet and the graphene layer is present at a content of 4 parts by weight or less, based on 100 parts by weight of the carbon included in the single graphene layer.

### Claim 12

A method for manufacturing a graphene-coated steel sheet, comprising:
washing a surface of a steel sheet in a vacuum container with inert gas ions; and
forming a graphene layer on the steel sheet by heating the washed steel sheet and injecting hydrocarbon into the vacuum container to dissociatively absorb the hydrocarbon onto the steel sheet.

### Claim 13 (depends on 12)

The method of claim 12, wherein a pressure in the vacuum container in the washing of the surface of the steel sheet is in a range of 10−5 Pa to 10−2 Pa.

### Claim 14 (depends on 12)

The method of claim 12, wherein the washing of the surface of the steel sheet is performed by repeatedly performing inert gas ion sputtering (Ar ion sputtering) and electron beam heating (e-beam heating) on the surface of the steel sheet 10 to 200 times.

### Claim 15 (depends on 12)

The method of claim 12, wherein carbon (C) remaining on a surface of the washed steel sheet is present at a content of 15 parts by weight or less, based on 100 parts by weight of the carbon included in the single graphene layer.

### Claim 16 (depends on 12)

The method of claim 12, wherein sulfur (S) remaining on the surface of the washed steel sheet is present at a content of 4 parts by weight or less, based on 100 parts by weight of the carbon included in the single graphene layer.

### Claim 17 (depends on 12)

The method of claim 12, wherein a heating temperature of the washed steel sheet is in a range of 400° C. to 1,100° C.

### Claim 18 (depends on 12)

The method of claim 12, wherein the hydrocarbon is injected at an amount of 10 Langmuirs or more.

### Claim 19 (depends on 12)

The method of claim 12, wherein the hydrocarbon is an alkyne-based hydrocarbon, an alkene-based hydrocarbon, or an alkane-based hydrocarbon.

### Claim 20

A method for manufacturing a graphene-coated steel sheet, comprising:
washing a surface of a steel sheet in a vacuum container with inert gas ions; and
forming a graphene layer on the steel sheet by heating the washed steel sheet to separate carbon included in the steel sheet.

### Claim 21 (depends on 20)

The method of claim 20, wherein a pressure in the vacuum container in the washing of the surface of the steel sheet is in a range of 10−5 Pa to 10−2 Pa.

### Claim 22 (depends on 20)

The method of claim 20, wherein the washing of the surface of the steel sheet is performed by repeatedly performing inert gas ion sputtering (Ar ion sputtering) and e-beam heating on the surface of the steel sheet 10 to 200 times.

### Claim 23 (depends on 20)

The method of claim 20, wherein carbon (C) remaining on a surface of the washed steel sheet is present at a content of 15 parts by weight or less, based on 100 parts by weight of the carbon included in the single graphene layer.

### Claim 24 (depends on 20)

The method of claim 20, wherein sulfur (S) remaining on the surface of the washed steel sheet is present at a content of 4 parts by weight or less, based on 100 parts by weight of the carbon included in the single graphene layer.

### Claim 25 (depends on 20)

The method of claim 20, wherein a heating temperature of the washed steel sheet is in a range of 400° C. to 1,100° C.