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A method for preparing noble metal/graphene composite nanomaterials by atmospheric pressure cooling plasma

A graphene composite and cold plasma technology, which is applied in metal processing equipment, transportation and packaging, coating, etc., can solve the problems of complex process, poor stability of composite materials, non-environmental protection, etc., and achieve high efficiency, simple operation, particle size uniform effect

Active Publication Date: 2020-05-22
武汉中科先进材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of this method does not require the use of toxic reagents, and is environmentally friendly and efficient. However, hydrogen and a vacuum environment are required, and there are certain potential safety hazards.
[0005] In summary, the current preparation technology of metal / graphene composites has problems such as poor stability of the obtained composites, long preparation cycle, complicated process and not environmental protection.

Method used

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  • A method for preparing noble metal/graphene composite nanomaterials by atmospheric pressure cooling plasma
  • A method for preparing noble metal/graphene composite nanomaterials by atmospheric pressure cooling plasma
  • A method for preparing noble metal/graphene composite nanomaterials by atmospheric pressure cooling plasma

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Comparison scheme
Effect test

Embodiment 1

[0042] The method for preparing gold / graphene composite nanomaterials by atmospheric pressure cold plasma includes the following steps:

[0043] (1) Disperse graphene oxide sheets in water to prepare a 1 mg / mL graphene oxide suspension, take 5 mL of graphene oxide suspension and mix 5 mL of a chloroauric acid solution with a concentration of 1 mmol / L, and use an ultrasonic frequency of 40 kHz. After sonicating for 10 minutes, a uniform mixed dispersion is obtained;

[0044] (2) Take the above 10mL mixed dispersion liquid in a petri dish, move it under the plasma generator, and adjust the height so that the distance of the plasma jet nozzle on the liquid surface is 10mm, and the anode end of the metal sheet is in contact with the mixed dispersion Liquid surface; pass argon gas, adjust the gas flow rate to 2.5mL / min, turn on the plasma generator, adjust the peak voltage to 5kV, and the frequency to 9kHz to generate a stable cold plasma jet, which acts on the mixed dispersion for 5 mi...

Embodiment 2

[0047] The method for preparing gold / graphene composite nanomaterials by atmospheric pressure cold plasma includes the following steps:

[0048] (1) Disperse graphene oxide flakes in water to prepare a 1mg / mL graphene oxide suspension, take 5mL graphene oxide suspension and 5mL silver nitrate solution with a concentration of 1mmol / L and mix it under the condition of an ultrasonic frequency of 40kHz , After 10 minutes of sonication, a uniform mixed dispersion is obtained;

[0049] (2) Take the above 10mL mixed dispersion in a petri dish, move it under the plasma generator, and adjust the height so that the distance between the liquid surface and the plasma jet nozzle is 15mm, and the anode end of the metal sheet is in contact with the mixing Dispersion liquid level; pass in argon gas, adjust the gas flow to 4mL / min, turn on the plasma generator, adjust the peak voltage to 8kV, and the frequency to 10kHz to generate a stable cold plasma jet, which acts on the mixed dispersion for 10 ...

Embodiment 3

[0052] The method for preparing gold / graphene composite nanomaterials by atmospheric pressure cold plasma includes the following steps:

[0053] (1) Disperse graphene oxide flakes in water to prepare 1mg / mL graphene oxide suspension, take 5mL graphene oxide suspension and 5mL silver nitrate solution with a concentration of 5mmol / L and mix, under the condition of ultrasonic frequency of 40kHz , After 10 minutes of sonication, a uniform mixed dispersion is obtained;

[0054] (2) Take the above 10mL mixed dispersion liquid in a petri dish, move it under the plasma generator, and adjust the height so that the distance between the liquid surface and the plasma jet nozzle is 5mm, and the anode end of the metal sheet is in contact with the mixing Dispersion liquid level; pass in argon gas, adjust the gas flow to 4mL / min, turn on the plasma generator, adjust the peak voltage to 8kV, and the frequency to 10kHz to generate a stable cold plasma jet, which acts on the mixed dispersion for 10 m...

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Abstract

The invention relates to a method for preparing noble metal / graphene composite nanomaterials by atmospheric pressure cooling plasma, comprising the following steps: (1). After mixing the graphene oxide suspension and the noble metal salt solution, ultrasonically uniform to obtain a mixed dispersion; ( 2). Take the mixed dispersion liquid in a petri dish, move the petri dish to the bottom of the plasma generator, adjust the distance between the plasma jet nozzle and the liquid surface of the mixed dispersion liquid, and make the anode end of the metal sheet contact the mixed dispersion liquid Liquid level; (3). Pass the inert gas into the plasma generator, adjust the gas flow rate, turn on the plasma generator, generate a stable cold plasma jet, and act on the mixed dispersion for 1-10min; (4). Centrifuge, Noble metal / graphene composite nanomaterials are obtained; the preparation process of the present invention does not need to use any reducing agent, does not contain toxic reagents, and belongs to green environmental protection technology.

Description

Technical field [0001] The invention relates to a graphene composite nano material, in particular to a method for preparing a precious metal / graphene composite nano material by an atmospheric pressure cold plasma. Background technique [0002] Graphene, as an excellent carrier material, has a strong interaction with precious metal nanoparticles, which can significantly improve the catalytic performance and utilization of precious metal nanoparticles. The main reason for this effect is that the super large surface area of ​​graphene can effectively reduce the particle size of precious metal nanoparticles. The interaction between graphene and precious metal nanoparticles changes the electronic structure of precious metal nanoparticles. [0003] Noble metal / graphene composite nanomaterials have both the advantages of metal nanomaterials and the characteristics of graphene. In recent years, they have gradually received extensive attention and research. Noble metal / graphene composite m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02
CPCB22F9/24B22F2202/13B22F1/17
Inventor 李鹏辉江敏黄逸凡喻学锋李志斌
Owner 武汉中科先进材料科技有限公司