Conductive graphene interfacial barriers for liquid metal electronics

Patent metadata

Field	Value
Publication number	US-11057994-B2
Application number	US-201816648275-A
Country	US
Kind code	B2
Filing date	Oct 3, 2018
Priority date	Oct 3, 2017
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

Articles, electronic devices and related methods of fabrication interfacing graphene with a gallium liquid metal alloy.

First claim

We claim:

1. An article of manufacture comprising a gallium liquid metal alloy component coupled to a graphene component comprising at least one of a cellulosic dispersing agent and an annealation product thereof.

2. The article of claim 1 wherein said cellulosic dispersing agent is selected from ethyl cellulose and nitrocellulose dispersing agents.

3. The article of claim 1 wherein said gallium alloy component comprises gallium and indium.

4. The article of claim 3 wherein said gallium alloy component is a eutectic gallium-indium liquid metal alloy.

5. The article of claim 1 comprising a metallic component coupled to said gallium liquid metal alloy component with said graphene component.

6. The article of claim 5 wherein said metallic component is an electrically-conductive metal.

7. The article of claim 6 wherein said metal is silver.

8. The article of claim 1 incorporated into an electrical device comprising a silver metal configured to provide an electrical circuit.

9. An electronic device comprising an electrically-conductive metal component coupled to a substrate, a nanodimensioned gallium-indium liquid metal alloy component coupled to said metal component with a nanodimensioned graphene component, said graphene component comprising at least one of a cellulosic dispersing agent and an annealation product thereof.

10. The device of claim 9 wherein said cellulosic dispersing agent is selected from ethyl cellulose and nitrocellulose dispersing agents.

11. The device of claim 9 wherein said gallium-indium component is a eutectic gallium-indium liquid metal alloy.

12. The device of claim 9 wherein said metal is silver.

13. The device of claim 12 wherein said silver metal is configured to provide an electrical circuit.

14. The device of claim 9 wherein said substrate is flexible.

15. The device of claim 14 wherein said substrate comprises a polyimide.

16. A reconfigurable electronic device comprising a liquid metal circuit switch, said switch comprising:
opposed metal electrodes coupled to a substrate, said electrodes having a voltage thereacross; and
a mobile gallium-indium liquid metal alloy component configured between and coupled to at least one said electrode with a graphene component comprising at least one of a cellulosic dispersing agent and an annealation product thereof,

whereby configuration of said metal alloy component contacts one said electrode and opens a circuit between said electrodes; and whereby reconfiguration of said metal alloy component contacts both said electrodes and closes a circuit therebetween.

17. The device of claim 16 wherein said cellulosic dispersing agent is selected from ethyl cellulose and nitrocellulose dispersing agents.

18. The device of claim 16 wherein said gallium-indium component is a eutectic gallium-indium liquid metal alloy.

19. The device of claim 16 wherein said electrodes comprise silver.

20. The device of claim 16 wherein said substrate is flexible.

21. The device of claim 20 wherein said substrate comprises a polyimide.

22. A method of using a graphene composition to facilitate stable electrical connection with a gallium liquid metal alloy, said method comprising:
providing a substrate having an electrically-conductive metal component coupled thereto;
contacting a graphene composition with said metal component to provide a metal-graphene junction, said graphene composition comprising graphene and at least one of a cellulosic dispersing agent and an annealation product thereof; and
contacting a gallium liquid metal alloy with said graphene composition to provide a graphene-gallium alloy junction, said graphene composition providing an electrically-conductive component between said metal and said gallium liquid metal alloy, thereby modulating alloy formation with said metal component.

23. The method of claim 22 wherein said graphene component is annealed.

24. The method of claim 23 wherein said component is annealed at a temperature of about 250° C.-about 350° C.

25. The method of claim 24 wherein said gallium liquid metal alloy comprises a line configuration, and the aspect ratio of said alloy line decreases with increasing annealation temperature.

26. The method of claim 22 wherein said metal is silver.

27. The method of claim 26 wherein said alloy comprises gallium and indium.

28. The method of claim 27 wherein said alloy is a eutectic gallium-indium liquid metal alloy.

29. The method of claim 28 whereby the resistance of said silver-graphene-eutectic gallium-indium junction is less than the resistance of a silver-graphene junction or the resistance of a graphene-eutectic gallium-indium junction.

30. The method of claim 22 wherein said graphene composition is a graphene ink comprising a dispersing agent selected from an ethyl cellulose and a nitrocellulose.

31. The method of claim 30 wherein said contact is selected from inkjet printing, screen printing, aerosol jet printing, gravure printing and blade-coating.

Assignees

• Univ Northwestern
• Us Gov Air Force

Inventors

• Hersam Mark C
• Secor Ethan B
• Cook Alexander B
• Tabor Christopher

Classifications

• H05K1/097 Primary

  Inks comprising nanoparticles and specially adapted for being sintered at low temperature (H05K1/095 takes precedence) · CPC title

• H05K2201/0323

  Carbon · CPC title

• H05K2201/10053

  Switch · CPC title

• H05K2203/1173

  Differences in wettability, e.g. hydrophilic or hydrophobic areas · CPC title

• H05K2203/1194

  Thermal treatment leading to a different chemical state of a material, e.g. annealing for stress-relief, aging · CPC title