High-performance graphene film and fiber and its gel conversion preparation method

A graphene fiber and graphene film technology, applied in the field of materials, can solve the problems of reducing the electrical conductivity and heat transfer of the film, hindering the electron transmission of the graphene sheet, increasing the contact resistance, etc., achieving excellent toughness and facilitating industrial continuous production Effect with promotion, good water resistance

Active Publication Date: 2017-11-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the introduction of these exogenous substances often hinders the electron transport between graphene sheets, increases the contact resistance, and reduces the electrical conductivity and heat transfer of the film.

Method used

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  • High-performance graphene film and fiber and its gel conversion preparation method
  • High-performance graphene film and fiber and its gel conversion preparation method
  • High-performance graphene film and fiber and its gel conversion preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Embodiment 1, by acidification induction graphene oxide gelation, prepare graphene film:

[0083] Preparation of graphene oxide dispersion:

[0084] 1) Add 3.0g of 325 mesh natural graphite powder into the reaction bottle, then slowly add 72mL of 98wt% concentrated sulfuric acid, stir evenly, and control the temperature of the reaction system below 5°C. Under low temperature conditions, stir evenly and slowly add 9.0g of potassium permanganate powder, control the temperature of the system at 0-40°C for 1 hour of constant temperature reaction, slowly add 300mL of cold dilute sulfuric acid with a concentration of 7.4% by mass, and then carry out the reaction at constant temperature 8h;

[0085] 2) Pour the reaction mixed system obtained in step 1) into an ice-water mixing bath to terminate the reaction, continue stirring for 15 minutes, and add 3 wt% hydrogen peroxide aqueous solution until no more bubbles are generated. The reaction solution turned from brown to khaki,...

Embodiment 2

[0092] Embodiment 2, the graphene film is prepared by inducing the gelation of graphene oxide by thermal annealing.

[0093] Preparation of graphene oxide dispersion:

[0094] 1) Add 3.0g of 325 mesh natural graphite powder into the reaction bottle, then slowly add 100mL of 98wt% concentrated sulfuric acid, stir evenly, and control the temperature of the reaction system below 5°C. Under low temperature conditions, stir evenly and slowly add 12.0g of potassium permanganate powder, control the temperature of the system at 0-40°C for constant temperature reaction for 16h, slowly add 300mL of cold dilute sulfuric acid with a mass percentage concentration of 9.8% for 12h;

[0095]2) Pour the reaction mixed system obtained in step 1) into an ice-water mixing bath to terminate the reaction, continue stirring for 15 minutes, and add 3 wt% hydrogen peroxide aqueous solution until no more bubbles are generated. The reaction solution turned from brown to brown, and the suspension was fi...

Embodiment 3

[0102] Embodiment 3, by acidification induction graphene oxide gelation, prepares graphene fiber:

[0103] With the graphene oxide hydrogel prepared in Example 1 as the processing precursor, the extrusion speed of 18mL / h is passed through a capillary with a diameter of 260 μm through a spinning device, and a flat substrate is carried by a slide table moving at a constant speed below to match the Velocity receives extruded graphene oxide gel fibers. The fiber was dried at room temperature to obtain graphene oxide ribbon fiber.

[0104] The ribbon-shaped fiber obtained in step 1) was placed in a mixed solvent of hydroiodic acid / methanol with a volume ratio of 1:3 for room temperature reduction for 12 hours, washed and dried with ethanol to obtain pure graphene fibers with high conductivity.

[0105] The graphene fiber prepared through the above steps has good toughness, can be woven and knotted, and the graphene sheets are arranged along the axial direction of the fiber. Figu...

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Abstract

The invention discloses a high-performance graphene film and fiber and a gel conversion preparation method thereof. Natural graphite powder was oxidized by the improved Hummers method to obtain graphene oxide colloidal solutions with different oxidation degrees and different defect densities. Based on the method of sol-gel chemistry, acidification or mild thermal annealing are used to transform the flowing sol state of graphene oxide dispersion into viscous gel state. And further obtain graphene oxide film and graphene fiber with good mechanical strength. The preparation process of the method is simple, efficient and cheap, and can be produced and applied continuously on a large scale. At the same time, this method does not use an additional crosslinking agent, and does not use a coagulation bath. The preparation process is environmentally friendly, simple and time-saving, and the prepared graphene film and fiber have excellent mechanical properties, high electrical conductivity, and good thermal conductivity. Excellent toughness, with good application prospects.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a high-performance graphene film and fiber and a gel conversion preparation method thereof. Background technique [0002] Elemental carbon has various allotropes: diamond, graphite, fullerene, carbon nanotube, graphene, etc. Graphene has a single-atom-thick two-dimensional planar graphite lattice structure, which can be wrapped into zero-dimensional fullerenes, rolled into one-dimensional carbon nanotubes, or stacked into three-dimensional graphite. The unique two-dimensional single-layer structure endows graphene with many excellent properties, including high electrical conductivity, carrier mobility, excellent thermal conductivity, light transmission, mechanical properties, and huge specific surface area, so it is used in electronic devices, Photoelectric conversion, electrochemical energy storage, sensing, polymer composites, and thermoelectric materials have shown great application pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198C01B32/184D01F9/12D01F11/12
Inventor 石高全李春张淼刘强
Owner TSINGHUA UNIV
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