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Preparation method for high-conductivity graphene and silver nanoparticle composite materials

A composite material and high conductivity technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of reducing the conductivity of composite materials and complicated preparation methods, and achieve enhanced conductivity, Effects of inhibiting aggregation and ensuring electrical conductivity

Active Publication Date: 2014-03-19
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although there have been some reports on graphene / silver nanocomposites, their preparation methods are relatively complicated, and there are few studies involving their electrical conductivity; in addition, most of the reported methods use polymer stabilizers as silver nanoparticles. The protective agent reduces the electrical conductivity of the composite material

Method used

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  • Preparation method for high-conductivity graphene and silver nanoparticle composite materials
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  • Preparation method for high-conductivity graphene and silver nanoparticle composite materials

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Preparation of graphene oxide: Add 1g of graphite and 1g of sodium nitrate to 46ml of concentrated sulfuric acid (70%) in an ice-water bath, stir at 350rpm / min for 1h, add 6g of potassium permanganate at a temperature of 0-20°C, and heat up to React at 35°C for 60 minutes, add 90ml of deionized water dropwise, heat up to 95°C for 30 minutes, and finally add 10ml of hydrogen peroxide and 200ml of deionized water, wait until the reactant turns brown, centrifuge while hot (1000rpm for 2min, remove Precipitate, repeat 3 times; centrifuge at 8000rpm for 15min, collect the precipitate, repeat 3 times). Then wash with (5%) hydrochloric acid, ethanol and deionized water until the pH is neutral, freeze-dry in vacuum for 24 hours, and collect graphene oxide;

[0044] (2) Preparation of graphene oxide aqueous solution: 0.025g of graphene oxide was dissolved in 100ml of deionized water, and ultrasonically treated at 40KHz and 150W for 90min;

[0045] (3) Preparation of graphen...

Embodiment 2

[0048] 1) Preparation of graphene oxide: Add 2g of graphite and 2g of sodium nitrate to 92ml of concentrated sulfuric acid (98%) in an ice-water bath, stir at 350rpm / min for 1h, add 12g of potassium permanganate at a temperature of 0-20°C, and raise the temperature to 30 ℃ for 90 minutes, add 180ml of deionized water dropwise, heat up to 98℃ for 60 minutes, and finally add 20ml of hydrogen peroxide and 400ml of deionized water, wait until the reactant turns brown, and centrifuge while it is hot (500rpm for 2min to remove the precipitate matter, repeat 3 times; centrifuge at 7000rpm for 20min, collect the precipitate, repeat 3 times). Then wash with 5% hydrochloric acid, ethanol and deionized water until the pH is neutral, freeze-dry in vacuum for 24 hours, and collect graphene oxide;

[0049] (2) Preparation of graphene oxide aqueous solution: 0.025g of graphene oxide was dissolved in 100ml of deionized water, and ultrasonically treated at 40KHz and 150W for 120min;

[0050] ...

Embodiment 3

[0053] (1) Same as step (1) in implementation example 1;

[0054] (2) Same as step (2) in implementation example 2;

[0055] (3) Preparation of graphene / silver nanoconductive composite material: Add 0.125g of silver nitrate to the dispersion obtained in step (2), add 0.069g of sodium citrate after heating up to 98°C, stir and react at a constant temperature of 98°C for 1 hour, then add 350μl ammonia water (35%) to adjust the pH to 9, then add 27mg hydrazine hydrate (80%), stir and react at 98°C for 4h, centrifuge at 3000rpm for 5min while it is hot, and collect the precipitate; then wash it with deionized water and ethanol several times until the pH It was neutral, and finally vacuum freeze-dried for 12 hours to obtain a graphene / silver nanoconductive composite material.

[0056] The particle size of the silver nanoparticles in the graphene / silver nano conductive composite material is 10-60nm, and the distribution number is obviously more than that in Example 2; when the soli...

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Abstract

The invention relates to a preparation method for high-conductivity graphene and silver nanoparticle composite materials. The method comprises the steps that graphene oxide is prepared at first; a graphene oxide water solution is prepared; silver nitrate is added into the obtained graphene oxide water solution, the temperature is risen to be 90+ / -10 DEG C, sodium citrate is added in the solution, and stirring and reaction are conducted; ammonium hydroxide and hydrazine hydrate are added into the obtained solution, and stirring and reaction are conducted at the temperature of 90+ / -10 DEG C; deionized water and ethyl alcohol are adopted to clean the reaction product, vacuum freeze drying is conducted on the cleaned reaction product, and then the conductive graphene and silver nanoparticle composite materials are obtained. The conductivity of the composite materials is 3.71-18.32S / cm, the graphene and silver nanoparticle composite materials prepared based on the method can greatly improve the conductivity of graphene, and can be further applied in the field of printed electronics.

Description

technical field [0001] The invention relates to a method for preparing a high-conductivity graphene / silver nanocomposite material. The obtained composite material is a conductive composite material with graphene as the main body and silver nanoparticles as the doping phase, which can improve the graphene The electrical conductivity belongs to the technical field of new material preparation. Background technique [0002] Graphene is an emerging carbon material with a thickness of one atom. Because of its high mechanical strength, large specific surface area and high electron mobility, it is widely used in transistors, photovoltaic devices, fuel cells and supercapacitors. At present, the methods used to prepare graphene include: micromechanical exfoliation method, chemical vapor deposition method, redox method, solvent exfoliation method and solvothermal method, etc. Among them, the redox method has simple process, low cost, and large-scale production, and has been considered...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00B82Y30/00
Inventor 韩璐刘成梅赵玉霞危岩李路海魏先福
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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