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Graphene composite conductive material and preparation method

A graphene composite and conductive material technology, applied in the field of water-based electrode materials or composite materials, can solve the problems of inability to form π-π interaction, poor effect of improving electrical properties of materials, poor dispersion uniformity of graphene, etc., and achieves the preparation method Simple and reliable, excellent electrical properties and film-forming properties, good film-forming and stability effects

Active Publication Date: 2017-06-09
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the first method, due to the large specific surface area of ​​graphene and the particle size in the nanometer range, graphene is easy to agglomerate in the PEDOT:PSS dispersion, resulting in poor dispersion uniformity of graphene and poor effect on improving the electrical properties of the material; The second method, such as Zhang Jianrong, Sun Dong, Preparation method of graphene / poly(3,4-ethylenedioxythiophene) composite nanomaterials: China, 201210003540.6 [P] 2012-07-18, simply mentions that Graphene is added to the PEDOT monomer for in-situ polymerization, but the electrical properties of the material have not been studied in detail. In fact, due to the higher carrier mobility of graphene compared with PEDOT, in-situ polymerization At this time, good π-π interaction cannot be formed between graphene and PEDOT molecular chains, and the effect of improving the electrical properties of the material is not good.

Method used

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  • Graphene composite conductive material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Preparation methods such as figure 1shown in the following steps:

[0038] 1. Weigh 20g polystyrene sulfonate sodium salt (molecular weight>100000), and dissolve it in 1000mL deionized water. After being completely dissolved, 6 g of graphene was added to the solution, stirred rapidly for 30 minutes and then ultrasonicated for 2 hours until completely dispersed.

[0039] 2. Add 10 g of 3,4-ethylenedioxythiophene monomer dropwise to the above mixture, and keep stirring at 10°C until the system is uniform and stable.

[0040] 3. With 25g main initiator ammonium persulfate ((NH 4 ) 2 · SO 4 ) into the mixing system, fully stirred until completely dissolved.

[0041] 4. The co-initiator iron sulfate (Fe 2 (SO 4 ) 3 ) solution was added dropwise to the reaction system in an amount of 20 mL, and then reacted in an ice-water bath for 24 hours to obtain a crude mixed solution.

[0042] 5. Exchanging the crude mixed solution with a cation exchange resin to remove residua...

Embodiment 2

[0045] Except changing the amount of graphene to 5g, the remaining amount, preparation and film-forming methods and steps are the same as in Example 1. The electrical conductivity, seebeck coefficient and film-forming properties of the final film are shown in Table 1.

Embodiment 3

[0047] Except that the amount of graphene is changed to 4g, the remaining amount, preparation and film-forming methods and steps are the same as in Example 1. The electrical conductivity, seebeck coefficient and film-forming properties of the final film are shown in Table 1.

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Abstract

The invention provides a graphene composite conductive material and a preparation method. The graphene composite conductive material is prepared from a conductive polymer monomer, graphene, a dispersant, an initiating system and deionized water, wherein the conductive polymer monomer is 3,4-ethylenedioxythiophene; the dispersant is sodium polystyrene sulfonate salt. The graphene composite conductive material has the advantages that the graphene is fully dispersed in the composite water-soluble conductive material, and a dense interaction microstructure is formed between the poly-3,4-ethylenedioxythiophene and the graphene by a particular in-situ polymerizing method, so that the electrical property index of the composite conductive ink is obviously improved by adding a small amount of graphene into the system; compared with the process without adding the graphene, the electric conductivity and seebeck coefficient are greatly improved.

Description

technical field [0001] The invention relates to a graphene composite conductive material and a preparation method thereof, belonging to the technical field of aqueous electrode materials or composite materials. Background technique [0002] Graphene (Graphene) is a two-dimensional carbon atom crystal with sp2 hybrid orbitals. It has a honeycomb crystal structure and is currently the thinnest material in the world - a single-atom-thick material. Its thickness is only 0.335nm, which is One-200,000th the thickness of a human hair. Graphene is the basic unit of other carbon nanomaterials: carbon nanotubes that can be curled to form a one-dimensional structure, can also be folded into cage-like fullerenes, and can also be stacked to form graphite. The unique two-dimensional crystal structure of graphene endows The excellent performance of graphene, it not only has excellent electrical properties (carrier mobility at room temperature can reach 20000cm 2 ·V -1 ·s -1 ), good the...

Claims

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Application Information

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IPC IPC(8): C08G61/12C08K3/04
CPCC08G61/126C08K3/04
Inventor 许孔力夏雨嵇培军王国勇张庆辉
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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