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Graphene fiber and method for manufacturing same

Inactive Publication Date: 2014-01-02
IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a new type of graphene fiber that has a wrinkled structure that helps maintain its strength and conductive properties. This fiber is much stronger and more conductive than traditional graphene papers, films, and flexible graphite. It can be used in energy storage devices like batteries and supercapacitors without the need for a separate metal electrode. The fiber can be woven into fabrics or formed into knots or springs, making it suitable for a variety of applications. It is also easy and cheap to produce and can be extended to long lengths in a continuous process.

Problems solved by technology

A major challenge for graphene structures with high strength and toughness is to maintain the inherent active surface of graphene by preventing restacking of graphene tending to form close-packed layer structures.
The dense layered structure of graphene is an obstacle in achieving maximum mechanical properties owing to the short length of graphene that reduces the van der Waals force and tensile strength between graphene layers (by 1% or less).
However, there is no report regarding the development of composite fibers including graphene alone or at a considerable concentration while maintaining the wrinkled structure of graphene.
The dense layered structure of graphene composites limits application thereof to energy and hydrogen storage media.

Method used

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  • Graphene fiber and method for manufacturing same
  • Graphene fiber and method for manufacturing same
  • Graphene fiber and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Solution of Graphene (RCCG) Chemically Converted by Reduction

[0044]In accordance with the method illustrated in FIG. 1, RCCG was dispersed in dimethylformamide (DMF) in the presence of an appropriate amount of triethylamine to obtain a stable graphene dispersion. Several grams of RCCG was obtained by reducing an aqueous dispersion of CCG with excess hydrazine at 95° C. over 2 h in accordance with previously reported methods (Li, D., Muller, M. B., Gilje, S., Kaner, R. B. & Wallace, G. G. Processable aqueous dispersions of graphene nanosheets. Nature Nanotech. 3, 101 (2008)). As a result of the reduction reaction, the graphene aggregated in the aqueous solution. The graphene aggregates were acidified with dilute sulfuric acid under vigorous stirring to a pH of 2 or less, and transferred to a sintered funnel. The aggregates were washed with a large amount of Milli-Q water on the funnel until the pH reached about 7. The filtered material was dried under vacuum at 70° C. ...

example 2

Production of Graphene Fiber

[0045]The solvent (DMF) of the graphene flake dispersion was exchanged with distilled water by centrifugation. The G / F aqueous solution was mixed with sodium dodecyl benzene sulfonate (SDBS) by ultrasonication.

[0046]The graphene dispersion was slowly injected into a coagulation bath containing PVA (molecular weight=89,000-124,000, degree of hydrolysis=˜99%) through a syringe (26 gauge) and wet spun to continuously produce a uniform graphene / PVA fiber.

[0047]The graphene / PVA was annealed at 600° C. to remove the PVA, leaving behind a porous fiber composed of graphene alone. The diameter of the graphene fiber was 28 μm.

experimental example

Characterization of the Graphene Fiber

[0048]The graphene fiber was sufficiently flexible and thus could be wound on a glass tube having a small diameter of 6.5 mm without mechanical damage, unlike graphene papers tending to be brittle (FIG. 1B). Complete knots of the graphene fiber were difficult to form, but the formation of sufficiently strong, flexible, small diameter knots of the graphene fiber was possible (FIG. 1C). Difficulty in the formation of complete knots was due to the small length of the graphene flakes and the frictional force of the rough surface of the graphene fiber composed of the graphene flakes (FIG. 2B). Several strands of the graphene fiber can also be woven into a fabric.

[0049]FIG. 2 shows SEM images of the surface and cross-sectional morphologies of the graphene fiber obtained by removing the PVA from the graphene / PVA composite fiber. After annealing at 600° C. for 1 h or treatment with 37% hydrochloric acid for 24 h, the graphene fiber had a rough surface b...

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Abstract

The present invention relates to a method for manufacturing a graphene fiber and a graphene fiber manufactured thereby, comprising the following steps: a) preparing a dispersion liquid by dispersing graphene with a surfactant in a solvent; b) preparing a composite fiber by mixing the dispersion liquid with a polymer solution, wet spinning and drying same; and c) removing polymers by heat-treating or treating the composite fiber with strong acid. The graphene fiber manufactured by the method has superior electric and mechanical properties, is flexible, and can be utilized as a storage medium for energy, hydrogen, etc. due to porosity from having a wrinkled structure.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for producing a graphene fiber and a graphene fiber produced by the method. More specifically, the present invention relates to a porous graphene fiber including graphene whose wrinkled structure is maintained to achieve excellent mechanical and electrochemical properties, and a method for producing the graphene fiber.BACKGROUND ART[0002]Graphene is a two-dimensional nanostructure of covalently bonded carbon atoms and exhibits outstanding mechanical, electrical, and thermal properties. Graphene flakes consist of single or several graphene sheets exfoliated from graphite. Graphene flakes have been reconstituted into bulky structures that have a modulus of elasticity exceeding that of flexible graphite while possessing high strength.[0003]A major challenge for graphene structures with high strength and toughness is to maintain the inherent active surface of graphene by preventing restacking of graphene tending to form clos...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B31/0438C01B31/0446B82Y30/00B82Y40/00C01B32/194D01D1/02D01D5/06D01D5/247D01F1/09D01F6/14D01F6/16D01F9/12Y10T428/2918D01D1/06
Inventor KIM, SEON JEONGSHIN, MIN KYOONKIM, SHI HYEONG
Owner IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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