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Method for reducing graphene oxide and preparing conductive nanometer composite material

A composite material, conductive nanotechnology, applied in chemical instruments and methods, carbon compounds, circuits, etc., to achieve the effect of improving electrical conductivity, good electrical conductivity and thermal stability, and good industrial prospects

Inactive Publication Date: 2012-07-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of graphene's excellent electrical conductivity, thermal conductivity and other excellent properties, more and more scholars in the world have participated in the synthesis and preparation of graphene. At present, the commonly used graphene preparation methods include micromechanical exfoliation, chemical deposition and epitaxy, however, the main obstacle to these methods is the scale-up of production

Method used

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  • Method for reducing graphene oxide and preparing conductive nanometer composite material
  • Method for reducing graphene oxide and preparing conductive nanometer composite material
  • Method for reducing graphene oxide and preparing conductive nanometer composite material

Examples

Experimental program
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Embodiment 1

[0037] Example 1: Ultrasonic dispersion of 250 mg of GO in 500 ml of deionized water (0.5 mg / ml), ultrasonic stripping and dispersion with an ultrasonic processor at room temperature, to obtain an aqueous solution of graphene oxide; subsequently, the GO aqueous solution was transferred to a 95 ° C Heat in an oil bath while stirring mechanically, add 2.5g of PPD powder and 1500μl of NH 3 Solution, continue to react, time reflux for 15 minutes; the reaction solution is filtered with PP membrane with a pore size of 0.2 μm. The product was rinsed with ethanol, treated with ultrasonic waves for 5 minutes each time, and then filtered the ultrasonic solution several times to remove the physically adsorbed PPD; the washed product was dried in a blast oven at 80°C for 24 Hour. Labeled GO-PPD-15min. Dissolve GO-PPD-15min in 500ml of THF, break the cells for 30min, and at the same time, at 35°C, dissolve 10g of PS pellets in THF (0.1g / ml), stir mechanically, and fully dissolve to obtai...

Embodiment 2

[0038] Example 2: Consistent with the reduction method in Example 1, the reflux time was increased to 30 minutes, and the obtained reaction solution was post-treated in Example 1 to obtain GO-PPD-30 minutes. GO-PPD-30min was dissolved in THF, which was consistent with the method for preparing the composite material in Example 1, and finally a 1.15vol% PS / GO-PPD composite material sample was also prepared (the GO raw material before the reaction was used as the measurement standard).

Embodiment 3

[0039] Example 3: Consistent with the reduction method in Example 1, the reflux time was increased to 3h, and the obtained reaction solution was post-treated in Example 1 to obtain GO-PPD-3h. Dissolving GO-PPD-3h in THF was consistent with the method for preparing the composite material in Example 1, and finally a 1.15vol% PS / GO-PPD composite material sample was also prepared (the GO raw material before the reaction was used as the measurement standard).

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Abstract

The invention relates to a method for reducing graphene oxide and preparing a conductive nanometer composite material, and particularly relates to a simple and effective method for simultaneously functionalizing and reducing the graphene oxide. The functionalizing and reducing of the graphene oxide can be realized by simple reflux with para-phenylene diamine, and epoxy groups on the graphene oxide react with amidogroup of the para-phenylene diamine in ammonia solution. Electric conductivity of graphene oxide-para-phenylene diamine is increased to 2.1*10<2>S / m, which is increased about nine orders of magnitude compared with the electric conductivity of the graphene oxide. In addition, since the graphene oxide-para-phenylene diamine can be well dispersed in a polymer and be reduced, graphene oxide-para-phenylene diamine is added into the polystyrene, so that the electric conductivity of the polystyrene can be effectively improved; and a seepage threshold value of the composite material is low to 0.34vol%, so that a sharp change happens from insulation to conductivity. Compared with the polystyrene, the polystyrene / graphene oxide-para-phenylene diamine can be improved in the thermal stability by 8 DEG C.

Description

Technical field: [0001] The invention significantly improves the electrical conductivity of graphene oxide, provides a simple and effective reduction path for reducing graphene oxide, and the graphene obtained by reduction is a new type of conductive filler with low cost and excellent electrical conductivity. The conductive and thermally stable polystyrene composite material of the present invention can be applied to a large number of fields requiring conductive nano composite materials, such as automobiles, electronics, and home appliances. Background technique [0002] Graphene is made of carbon atoms with sp 2 The two-dimensional honeycomb-shaped hexagonal lattice planar film composed of hybridized monoatomic layers is currently the most ideal two-dimensional nanomaterial. Since it was reported, due to its unique properties, it is being used to improve the electrical conductivity, thermal conductivity, flame retardancy and mechanical properties of materials, which has ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01B13/00C01B32/198
Inventor 于中振马慧玲李文娟张好斌
Owner BEIJING UNIV OF CHEM TECH
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