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Conductive graphene film and self-assembly preparation method thereof

A conductive graphite and self-assembly technology, applied in the field of conductive graphene film and its self-assembly preparation, can solve the problems of easy damage to the structure, easy reduction of strength, etc., and achieve the effects of tailorable shape, easy operation, and easy process.

Active Publication Date: 2011-05-11
深圳清研紫光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene oxide film obtained by this method needs to be converted into a graphene film through chemical reduction or high-temperature gas phase reduction, and the structure is easily damaged and the strength is easily reduced during the reduction process.

Method used

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  • Conductive graphene film and self-assembly preparation method thereof
  • Conductive graphene film and self-assembly preparation method thereof
  • Conductive graphene film and self-assembly preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Preparation of graphene powder material

[0022] The preparation reference document of graphene powder material (1.Mcallister M J, Lio J L, Adamson D H, et al.Singlesheet functionalized graphene by oxidation and thermal expansion of graphite[J].Chemistry ofMaterials, 2007,19 (18): 4396- 4404.) (2. Yang Quanhong et al., High electrochemical capacity graphene oxide and its low-temperature preparation method and application, Chinese patent, application number: 200810151807.X). Wherein document 1 is a high-temperature preparation method of graphene, and document 2 is a low-temperature preparation method of graphene.

[0023] 2) Preparation of graphene oxide solution

[0024] The preparation of graphene oxide solution refers to the literature (Chen C M, Yang Q H, Yang Y G, et al.Self-assembled free-standing graphite oxide membrane[J].Adv.Mater., 2009, DOI: 10.1002 / adma.200803726.) this In addition to the water used in the literature, the graphene oxide solution solvent ...

Embodiment 2

[0026] Embodiment 2: take by weighing 20mg according to the graphene powdery material prepared by low temperature method in embodiment 1 and 0.1mg (GT) 20 Put the single-stranded DNA into a 50ml beaker, add 30ml of water, and ultrasonically disperse in an ice-water bath for 1 hour, with an ultrasonic power of 120W, to obtain a well-dispersed graphene aqueous solution. Then move this well-dispersed graphene aqueous solution into a 50°C water bath and keep it for 45 minutes to form a uniform graphene film on the liquid surface. Remove the graphene film on the liquid surface and dry it at room temperature for 12 hours to obtain unsupported graphene membrane. Using four probes to measure the sheet resistance of this graphene film is 1Ω / sq, the thickness of this film is 30μm, and the area is 12cm 2 , as shown in 2 of 1.

Embodiment 3

[0027] Embodiment 3: take by weighing 100mg graphene powder material and 10mg sodium lignosulfonate prepared according to the low temperature method in Example 1 and put it into a 100mL beaker, add 50mL water, ultrasonically disperse 30min in an ice-water bath, ultrasonic power 300W, obtain Well-dispersed graphene aqueous solution. Weigh 20 mL of a 15 mg / ml graphene oxide aqueous solution that has been ultrasonicated for 3 hours and add it to the graphene aqueous solution, and mix evenly by ultrasonication. Finally, move this well-dispersed graphene aqueous solution into a 70°C water bath and keep it for 10 minutes. A uniform graphene film can be formed on the liquid surface. The graphene film on the liquid surface is removed and dried at room temperature for 12 hours to obtain an unsupported graphene membrane. Using four probes to measure the sheet resistance of this graphene film is 5900Ω / sq, the thickness of this film is 0.5μm, and the area is 19cm 2 .

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Abstract

The invention relates to a conductive graphene film and a self-assembly preparation method thereof. A graphene powder material and a dispersing aid are added into a reactor according to the mass ratioof 100-5: 1, then the mixture is added into a solvent, the mass-volume ratio of the solvent and graphene is 1-10: 1, the ultrasonic oscillation is performed for 30 minutes to 10 hours, the ultrasonicpower is between 20 and 300 W, and a graphene solution with good dispersion is obtained; and the graphene solution with good dispersion is transferred into a water bath with a temperature of between5 and 90 DEG C, the water bath temperature is lower than a boiling point of the solvent, the graphene solution is maintained in the water bath for 5 minutes to 3 hours, the graphene self-assembles ona gas-liquid surface to form a graphene film, and the graphene film is fished out from the liquid level and is dried at normal temperature to obtain the conductive graphene film. The square resistanceof the graphene film is within the range of between 5 and 3,000 omega / sq, the graphene film has good strength, and the thickness is between 2 and 100 mu m. The method has simple preparation process and easy operation; and the graphene film has the advantages of good conductivity and strength, controllable thickness, cuttable shape, adjustable scale, low cost, and easy process scale-up.

Description

technical field [0001] The invention belongs to graphene film preparation technology, in particular to a conductive graphene film and a self-assembly preparation method thereof. Background technique [0002] Graphene is a two-dimensional carbon atom crystal discovered in recent years, and it is one of the research hotspots in the field of carbonaceous materials and condensed matter physics. Graphene is the basic structural unit for constructing sp2 hybridized carbons such as zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional bulk graphite. Graphene has many strange properties. Graphene is a substance without an energy gap, showing metallicity; in single-layer graphene, each carbon atom has an unbonded electron, so it has very good conductivity; holes and electrons in graphene Separation from each other leads to the creation of new electron conduction phenomena, such as the irregular quantum Hall effect. Graphene has very broad application...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 杨全红吕伟夏章讯吴思达
Owner 深圳清研紫光科技有限公司
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