Graphene fiber and prepartion method thereof

Patent metadata

Field	Value
Publication number	US-10145029-B2
Application number	US-201414559630-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Apr 10, 2013
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A graphene fiber and a preparation method thereof, where the graphene fiber is a composite fiber of metal nanowire doped graphene fiber, and principal components of the composite fiber are graphene and metal nanowires, a mass ratio of metal nanowires is 0.1%-50%, the graphene is in a form of sheet, and both the metal nanowires and graphene sheets are arranged in parallel along an axial direction of the graphene fiber. The metal nanowire doped graphene fiber is a new type of a high performance multi-functional fiber material, which achieves a significant improvement in electrical conductivity of graphene fibers through doping of metal nanowires and meanwhile demonstrates excellent tensile strength and toughness. The metal nanowire doped graphene fiber has great potential application value in a plurality of fields, for example, it is used as a lightweight flexible wire.

First claim

What is claimed is:

1. A graphene fiber, wherein the graphene fiber is a composite fiber of metal nanowire doped graphene fiber,
wherein principal components of the composite fiber are graphene and metal nanowires, a mass ratio of metal nanowires is about 0.1%-50%, the graphene is in a form of plural graphene sheets arranged in parallel to each other, and
both all of the metal nanowires and all of the graphene sheets are arranged in parallel along an axial direction of the graphene fiber.

2. The graphene fiber according to claim 1 , wherein the mass ratio of metal nanowires is about 0.5%-50%.

3. The graphene fiber according to claim 2 , wherein the mass ratio of metal nanowires is about 0.5%, 20%, or 50%.

4. The graphene fiber according to claim 1 , wherein the metal nanowires comprise gold nanowires, silver nanowires, copper nanowires, Pt nanowires, iridium nanowires, rhodium nanowires, Fe nanowires, nickel nanowires, cobalt nanowires, zinc oxide nanowires, titanium nanowires, and alloy nanowires or hybrid nanowires of these nanowires.

5. The graphene fiber according to claim 1 , wherein the metal nanowires are silver nanowires.

6. The graphene fiber according to claim 1 , wherein the metal nanowire is about 3-300 nm in diameter and 100 nm-50 μm in length.

7. The graphene fiber according to claim 1 , wherein the graphene fiber is a one-dimensional fiber and about 1 μm-500 μm in diameter.

8. The graphene fiber according to claim 1 , wherein the graphene fiber is prepared by using graphene oxide and metal nanowire liquid crystals first through a wet spinning process, and then through chemical reduction or thermal reduction.

9. A graphene fiber, wherein the graphene fiber is a composite fiber of metal nanowire doped graphene fiber,
the composite fiber comprises a graphene and metal nanowires, a mass ratio of metal nanowires is a range from 0.1% to 50%, the graphene is in a form of plural graphene sheets arranged in parallel to each other, and
both all of the metal nanowires and all of the graphene sheets are arranged in parallel along an axial direction of the graphene fiber.

10. The graphene fiber according to claim 1 , wherein the mass ratio of metal nanowires is a range from 0.5% to 50%, the mass ratio of metal nanowires is 0.5%, 20%, or 50%, the metal nanowires comprise gold nanowires, silver nanowires, copper nanowires, Pt nanowires, iridium nanowires, rhodium nanowires, Fe nanowires, nickel nanowires, cobalt nanowires, zinc oxide nanowires, titanium nanowires, and alloy nanowires or hybrid nanowires of these nanowires.

11. A graphene fiber preparation method comprising: adding metal nanowires whose mass fraction is about 0.1%-50% to graphene oxide liquid crystals whose mass concentration is about 0.3%-3%, and then stirring at a speed of about 100-1000 rpm evenly to obtain graphene oxide-metal nanowire spinning sol;
passing the obtained graphene oxide-metal nanowire spinning sol through a spinning tube that is 5-500 μm in diameter at about a 1-100 mL/h extrusion speed and staying in about 5-80° C. coagulating fluid for about 1-100s to coagulate into filaments;
washing and drying the filaments to get an initial metal nanowire doped graphene oxide fiber;
placing the initial metal nanowire doped graphene oxide fiber in a reducing agent for about 0.1-100h reduction; and
washing or thermally reducing the initial metal nanowire doped graphene oxide fiber to get a final metal nanowire doped graphene fiber that is a composite fiber of metal nanowire doped graphene fiber whose principal components are graphene and metal nanowires,
wherein a mass ratio of the metal nanowires is about 0.1%-50%, the graphene is in a form of plural graphene sheets arranged in parallel to each other, and both all of the metal nanowires and all of the graphene sheets are arranged in parallel along an axial direction of the graphene fiber.

12. The graphene fiber preparation method according to claim 11 , wherein the graphene oxide liquid crystals are obtained by adding a certain amount of graphene oxide in solvent and stirring, wherein the solvent comprises water, N,N-dimethylformamide, N,N-dimethylacetamide, N-Methyl-2-pyrrolidone, methanol, ethanol, isopropanol, butanol, and ethylene glycol.

13. The graphene fiber preparation method according to claim 12 , wherein the mass concentration of the graphene oxide liquid crystals is about 0.3%, 0.5%, or 3%.

14. The graphene fiber preparation method according to claim 11 , wherein a mass ratio of the metal nanowires in the graphene fiber is about 0.5%, 20%, or 50%.

15. The graphene fiber preparation method according to claim 11 , wherein the metal nanowires comprise gold nanowires, silver nanowires, copper nanowires, Pt nanowires, iridium nanowires, rhodium nanowires, Fe nanowires, nickel nanowires, cobalt nanowires, zinc oxide nanowires, titanium nanowires, and alloy nanowires or hybrid nanowires of these nanowires.

16. The graphene fiber preparation method according to claim 11 , wherein the metal nanowires are silver nanowires.

17. The graphene fiber preparation method according to claim 11 , wherein the metal nanowires are about 3-300 nm in diameter and about 100 nm-50 μm in length.

18. The graphene fiber preparation method according to claim 11 , wherein the coagulating fluid comprises sodium hydroxide, potassium hydroxide, calcium chloride, sodium nitrate, potassium nitrate, sodium chloride, potassium chloride, ferric chloride solution, and ethyl acetate.

19. The graphene fiber preparation method according to claim 11 , wherein the reducing agent comprises hydrazine hydrate, sodium borohydride, vitamin C, hydrobromic acid, hydriodic acid, acetic acid, and their mixture.

20. The graphene fiber preparation method according to claim 11 , wherein a temperature range of heat treatment for the thermal reduction is about 200-1000° C., and a time range is about 1-100 h.

Assignees

• Huawei Tech Co Ltd
• Univ Zhejiang

Inventors

• Zhou Xiaosong
• Xu Yan
• Gao Chao
• Xu Zhen

Classifications

• C01B32/194

  After-treatment · CPC title

• D10B2101/20

  Metallic fibres · CPC title

• D01D5/06

  Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title

• D10B2101/12

  Carbon; Pitch · CPC title

• D01F9/12 Primary

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