Graphene and graphene derivatives as substrate coatings

Patent metadata

Field	Value
Publication number	US-12297112-B2
Application number	US-202117471678-A
Country	US
Kind code	B2
Filing date	Sep 10, 2021
Priority date	Sep 10, 2021
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

A coating layer for a substrate includes a coating material. The coating material includes graphene and/or graphene derivatives that reflect and/or absorb an electromagnetic (EM) wave having a frequency of above 20 GHz. The coating layer is deposited on a surface of the substrate.

First claim

What is claimed is:

1. A coating layer for a substrate, the coating layer comprising:
a coating material having graphene and/or graphene derivatives that reflect and/or absorb an electromagnetic (EM) wave having a frequency of above 20 GHz, wherein the coating material is deposited on a surface of the substrate; and
wherein the substrate has a thickness of ¼ of a wavelength of the EM wave.

2. The coating layer of claim 1 , wherein the substrate is a resin.

3. The coating layer of claim 2 , wherein the resin is polypropene (PP), polybutylene terephthalate (PBT), polyphenylene sulfide (PBS), acrylonitrile butadiene styrene (ABS), polyamindes (PA), or its composite.

4. The coating layer of claim 1 , wherein the substrate is a metal, a ceramic, a silicon substrate, or a hybrid thereof.

5. The coating layer of claim 1 , wherein the coating layer has a thickness in a range of 0.1 to 200 μm.

6. The coating layer of claim 1 , wherein the coating material is prepared by a Taylor-Couette reactor (TCR).

7. An electronic device comprising:
an electronic component emitting an electromagnetic (EM) wave with a frequency of above 20 GHz;
a metal substrate electrically coupled to the electronic device and covering the electronic component;
a spacer having a spacer material attached to the metal substrate; and
a coating layer having a coating material deposited on a surface of the spacer that faces away from the metal substrate, wherein the coating material is graphene and/or graphene derivatives that reflect and/or absorb the EM wave emitted by the electronic component, and wherein the coating material is prepared by a Taylor-Couette reactor (TCR).

8. The electronic device of claim 7 , wherein the spacer material is a resin.

9. The electronic device of claim 8 , wherein the resin is PP, PBT, PBS, ABS, PA, or its composite.

10. The electronic device of claim 7 , wherein the spacer material is a metal, a ceramic, a silicon substrate, or a hybrid thereof.

11. The electronic device of claim 7 , wherein the coating layer has a thickness in a range of 0.1 to 200 μm.

12. The electronic device of claim 7 , wherein the spacer has a thickness of ¼ of a wavelength of the EM wave.

13. A method of preparing graphene and/or graphene derivatives as a coating material for a substrate, the method comprising:
suspending graphite flakes in deionized water to give a first reaction mixture and stirring the first reaction mixture;
adding a stabilizer to the first reaction mixture to give a second reaction mixture and stirring the second reaction mixture;
adding a dispersant to the second reaction mixture to give a third reaction mixture and stirring the third reaction mixture;
adding the third reaction mixture to a Taylor-Couette reactor (TCR) for reaction which gives a fourth reaction mixture, the TCR having a stationary inner cylinder and a rotary outer cylinder;
centrifuging the fourth reaction mixture; and
collecting centrifugate from the fourth reaction mixture which contains exfoliated graphene.

14. The method of claim 13 , further comprising adding an intercalant material to the third reaction mixture.

15. The method of claim 14 , wherein the intercalant material is a metal or metal precursor element.

16. The method of claim 13 , further comprising adding a binder to the third reaction mixture.

17. The method of claim 16 , wherein the binder is polyacrylic acid (PAA), polyvinyl alcohol (PVA) or polyvinylpyrrolidone (PVP).

18. The method of claim 13 , further comprising depositing the exfoliated graphene onto the substrate using air-controlled electrospray (ACES).

19. The method of claim 18 , wherein the substrate is a resin, a metal, a ceramic, a silicon substrate, or a hybrid thereof.

20. The method of claim 18 , wherein the exfoliated graphene deposited onto the substrate has a thickness of 0.1 to 200 μm.

Assignees

• Denso Int America Inc
• Center For Technology Licensing Cornell Univ

Inventors

• Joo Yong Lak
• Gupta Naman
• Zamani Somayeh
• Joshi Yash
• Okumura Ryota
• Ito Shinichi
• Izor Elizabeth

Classifications

• C01B2204/04

  Specific amount of layers or specific thickness · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01B2204/22

  Electronic properties · CPC title

• C01P2002/82

  by IR- or Raman-data · CPC title

• B05D1/04

  involving the use of an electrostatic field {(B05D1/025 and B05D1/14 take precedence)} · CPC title