Graphene-coated steel sheet and method for producing same

Patent metadata

Field	Value
Publication number	US-12303933-B2
Application number	US-202017781921-A
Country	US
Kind code	B2
Filing date	Oct 20, 2020
Priority date	Dec 5, 2019
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

The present invention pertains to a method for producing a graphene-coated steel sheet, the method comprising the steps of: modifying the surface of the steel sheet so that the surface is negatively charged; forming a positively-charged first graphene oxide layer on the surface-modified steel sheet; forming a negatively-charged second graphene oxide layer on the first graphene oxide layer; and heat-treating the steel sheet on which the first and second graphene oxide layers are formed. The present invention provides a graphene coating method which can be easily applied to large-area coating through a simple process without a special dispersant or binder, and has the effect of allowing the excellent physical properties of graphene to be more efficiently exhibited.

First claim

The invention claimed is:

1. A method for manufacturing a graphene-coated steel sheet, the method comprising:
surface-modifying a steel sheet to have a negative charge;
forming a first graphene oxide layer having a positive charge on the surface-modified steel sheet;
forming a second graphene oxide layer having a negative charge on the first graphene oxide layer; and
heat-treating the steel sheet on which the first and second graphene oxide layers are formed,
wherein the graphene-coated steel sheet comprises a coating layer coated on the steel sheet,
wherein the coating layer comprises the first graphene oxide layer and the second graphene oxide layer, and
wherein the coating layer has a thickness of 0.5 μm to 5.0 μm.

2. The method of claim 1 , wherein the surface-modifying is performed by at least one method selected from ultraviolet-ozone (UV-Ozone) irradiation, electron beam (EB) irradiation, infrared (IR) irradiation, and near-infrared (NIR) irradiation.

3. The method of claim 1 , wherein the forming the first graphene oxide layer is performed using a graphene oxide dispersion solution modified with an amine group.

4. The method of claim 3 , wherein the graphene oxide dispersion solution modified with an amine group is prepared by reacting graphene oxide, N-ethyl-N′-(3-dimethylaminopropyl)carbodiimidemethiodide (EDC) and C 1 to C 6 alkylenediamine in water.

5. The method of claim 3 , wherein the graphene oxide dispersion solution modified with an amine group does not comprise a binder and a dispersant.

6. The method of claim 1 , wherein the forming the second graphene oxide layer is performed using a graphene oxide dispersion solution treated by at least one method selected from ultraviolet-ozone (UV-Ozone) irradiation, electron beam (EB) irradiation, infrared (IR) irradiation, and near-infrared (NIR) irradiation.

7. The method of claim 6 , wherein the graphene oxide dispersion solution does not comprise a binder and a dispersant.

8. The method of claim 1 , wherein the first and second graphene oxide layers are laminated through electrostatic interaction.

9. The method of claim 1 , wherein the first and second graphene oxide layers have an amide bond.

10. The method of claim 1 , wherein the forming the first graphene oxide layer and the forming the second graphene oxide layer are performed two or more times repeatedly.

11. The method of claim 1 , wherein the heat treatment is performed in a temperature range of 100 to 400° C.

12. The method of claim 1 , wherein the method further comprises washing using an aqueous solution of pH 1 to 6 after the forming the first graphene oxide layer.

13. The method of claim 1 , wherein the method further comprises washing using an aqueous solution of pH 8 to 14 after the forming the second graphene oxide layer.

14. The method of claim 1 , wherein the surface-modifying is performed by at least one method selected from ultraviolet-ozone (UV-Ozone) irradiation, infrared (IR) irradiation, and near-infrared (NIR) irradiation.

Assignees

• Posco

Inventors

• Yoo Hye-Jin
• Kim Jung-Su
• Baek Je-Hoon
• Byeon Chang-Se

Classifications

• C23C28/345

  with at least one oxide layer · CPC title

• B05D7/50

  Multilayers · CPC title

• B05D3/062

  Pretreatment · CPC title

• B05D3/06

  by exposure to radiation (B05D3/02 takes precedence {; plasma treatment B05D3/141}) · CPC title

• B05D3/044

  Pretreatment · CPC title