Carbon fibers and method of fabrication thereof

Patent metadata

Field	Value
Publication number	US-2023057063-A1
Application number	US-202117796979-A
Country	US
Kind code	A1
Filing date	Feb 4, 2021
Priority date	Feb 4, 2020
Publication date	Feb 23, 2023
Grant date	—

Abstract

A method of forming a fiber includes providing a sheet of a single layer of graphene or an oxidative analogue of graphene and applying force to the sheet to induce bending in the sheet and increase an aspect ratio thereof, thereby forming the fiber.

First claim

1 . A method of forming a fiber, comprising:
positioning a sheet of graphene or an oxidative analogue of graphene on a surface, positioning a first abutment members on a first side of the sheet and a second abutment member on a second side of the sheet, and applying force to at least one of the first abutment member and the second abutment member to induce bending in the sheet to decrease a width of the sheet and increase an aspect ratio thereof, thereby forming the fiber.

2 . The method of claim 1 wherein the oxidative analogue of graphene is graphene oxide or reduced graphene oxide.

3 . The method of claim 1 wherein chemical vapor deposition is used in forming the sheet.

4 . The method of claim 3 wherein the sheet is formed upon a layer of copper.

5 . The method of claim 4 further comprising forming a polymer layer on the sheet before applying force thereto.

6 . The method of claim 5 wherein the polymer layer comprises polymethyl methacrylate, polystyrene, or polycarbonate.

7 . The method of claim 5 wherein the layer of copper is removed prior to applying force to the sheet to induce bending in the sheet and increase the aspect ratio thereof.

8 . The method of claim 7 wherein the copper is removed by etching.

9 . The method of claim 5 further comprising removing the polymer layer after applying force to the sheet to induce bending in the sheet and increase the aspect ratio thereof.

10 . The method of claim 9 wherein the polymer layer is removed via heating the fiber to a temperature above a temperature at which thermal degradation of the polymer layer occurs.

11 . The method of claim 1 wherein the fiber has a nominal diameter no greater than 500 μm.

12 . (canceled)

13 . The method of claim 1 wherein the fiber has a length of at least 0.5 mm and wherein the fiber or a portion thereof created by fracture under tension has a mechanical tensile strength greater than 1.45 GPa.

14 . (canceled)

15 . The method of claim 1 wherein the bending is induced to create folds in the sheet, to create rolling in the sheet or to create twisting in the sheet.

16 . The method of claim 1 wherein the sheet has a surface area of at least 100 m 2 /g.

17 . A fiber formed by inducing bending in a sheet of a single layer of graphene or an oxidative analogue of graphene to increase an aspect ratio thereof, thereby forming the fiber.

18 . The fiber of claim 17 wherein the fiber has a nominal diameter no greater than 500 μm.

19 . (canceled)

20 . The fiber of claim 17 wherein the fiber has a length of at least 0.5 mm and a mechanical tensile strength greater than 1.45 GPa.

21 . (canceled)

22 . The fiber of claim 17 wherein the bending is induced to create folds in the sheet, to create rolling in the sheet to create twisting in the sheet.

23 . (canceled)

24 . The fiber of claim 17 formed by positioning a sheet of graphene or an oxidative analogue of graphene on a surface, positioning a first abutment member on a first side of the sheet and a second abutment member on a second side of the sheet, and applying force to at least one of the first abutment member and the second abutment member to induce bending in the sheet to decrease a width of the sheet and increase an aspect ratio thereof.

25 . A material, comprising: a plurality of fibers wherein each of the plurality of fibers is formed from a sheet of a single layer of graphene or an oxidative analogue of graphene in which bending has been induced in the sheet to increase an aspect ratio thereof thereby forming the fiber.

Assignees

• Univ Pittsburgh Commonwealth Sys Higher Education

Inventors

• Salim Muhammad Ghassan
• Liu Haitao
• Jacobs Tevis Davis
• Kim Min A
• Thimons Luke Anthony

Classifications

• C01B32/186

  by chemical vapour deposition [CVD] · CPC title

• D01F9/12 Primary

  Carbon filaments; Apparatus specially adapted for the manufacture thereof · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• D01D5/423

  by fibrillation of films or filaments · CPC title