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Method for preparing silicon dioxide/graphene nano composite material by microwave chemical vapor deposition and product thereof

A nano-composite material, silica technology, applied in gaseous chemical plating, metal material coating process, coating and other directions, can solve the research and application of graphene-based composite materials, low density specific surface area, difficult to exert performance, etc. problems, to achieve the effects of excellent mechanical properties, high thermal energy utilization rate, and fast heating speed

Active Publication Date: 2019-07-02
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Silica has excellent physical and chemical properties such as high purity, low density, high specific surface area, surface silanol groups can easily form hydrogen bonds of varying strengths with active silane bonds, and exhibits excellent optical, electrical, thermal, and mechanical properties. , magnetic, radiation, absorption and other special properties, due to the special size, structure and performance are widely used in all aspects of modern industrial production and life, for example, in the field of modern optical liquid crystal display, modern medicine, bioengineering, military fields are used At the same time, silica nanoparticles have the advantages of high mechanical strength and good fluidity, but there are a large number of hydroxyl groups on the surface of silica nanoparticles, which have strong hydrophilicity, resulting in poor compatibility with organic compounds, making it difficult to exert their excellent properties. performance
At present, CVD or PECVD methods are mostly used to prepare graphene-based composite materials, but there are disadvantages such as large energy consumption, high reaction temperature and relatively complicated preparation process, which affect the further research and application of graphene-based composite materials.

Method used

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  • Method for preparing silicon dioxide/graphene nano composite material by microwave chemical vapor deposition and product thereof
  • Method for preparing silicon dioxide/graphene nano composite material by microwave chemical vapor deposition and product thereof
  • Method for preparing silicon dioxide/graphene nano composite material by microwave chemical vapor deposition and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing silicon dioxide / graphene nanocomposites by microwave chemical vapor deposition, comprising the following steps:

[0035] (1) Place 0.1 g of silicon dioxide in the microwave plasma reaction chamber, feed nitrogen gas at a flow rate of 200 sccm as a protective gas, and heat at a heating rate of 35° C. / min for 20 minutes to make the microwave plasma reaction chamber The temperature reaches 700°C;

[0036] (2) Pass the mixed gas of hydrogen gas and methane gas into the reaction chamber of microwave plasma with the flow velocity of 200sccm, carry out in-situ growth on the silicon dioxide surface and form the graphene coating layer, stop feeding mixed gas after 1min, cool The silicon dioxide / graphene nanocomposite material can be obtained at room temperature, wherein the volume ratio of hydrogen gas and methane gas introduced is 1:8.

[0037] During the whole preparation process, the air pressure of the microwave plasma was kept at 40 Torr, and the pow...

Embodiment 2

[0044] A method for preparing silicon dioxide / graphene nanocomposites by microwave chemical vapor deposition, comprising the following steps:

[0045] (1) Place 0.1 g of silicon dioxide in the reaction chamber of microwave plasma, feed argon gas at a flow rate of 150 sccm as a protective gas, and heat at a heating rate of 25° C. / min for 20 minutes to make the reaction chamber of microwave plasma The temperature in the medium reaches 500°C;

[0046](2) Pass the mixed gas of hydrogen gas and ethylene gas into the reaction chamber of microwave plasma with the flow velocity of 150sccm, carry out in-situ growth on the silicon dioxide surface and form the graphene coating layer, stop feeding mixed gas after 30min, cool The silicon dioxide / graphene nanocomposite material can be obtained at room temperature, wherein the volume ratio of hydrogen gas and ethylene gas is 1:5.

[0047] During the whole preparation process, the air pressure of the microwave plasma was kept at 30 Torr, and...

Embodiment 3

[0050] A method for preparing silicon dioxide / graphene nanocomposites by microwave chemical vapor deposition, comprising the following steps:

[0051] (1) Place 0.1g of silicon dioxide in the microwave plasma reaction chamber, feed helium gas at a flow rate of 250sccm as a protective gas, and heat at a heating rate of 30°C / min for 30min to make the microwave plasma reaction chamber The temperature in it reaches 600°C;

[0052] (2) Pass the mixed gas of hydrogen gas and propyne gas into the reaction chamber of microwave plasma with the flow velocity of 250sccm, carry out in-situ growth on the silicon dioxide surface and form the graphene coating layer, stop feeding mixed gas after 60min, Cool to room temperature to obtain silicon dioxide / graphene nanocomposite material, wherein the volume ratio of hydrogen and propyne gas is 1:10.

[0053] During the whole preparation process, the air pressure of the microwave plasma was kept at 20 Torr, and the power of the microwave plasma w...

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Abstract

The invention discloses a method for preparing a silicon dioxide / graphene nano composite material by microwave chemical vapor deposition and a product thereof, and belongs to the technical field of composite material preparation. According to the method for preparing the silicon dioxide / graphene nano composite material by microwave chemical vapor deposition, a microwave vapor deposition method isadopted to prepare the silicon dioxide / graphene composite material in situ, and other pre-synthesis processes are not required, so that the preparation process is simple, and the production cost is reduced; and meanwhile, the microwave method has the characteristics of fast heating, high efficiency, low energy consumption and short production period. The silicon dioxide / graphene nano composite material is provided with a core-shell structure, and can combine the characteristics of high mechanical strength and high hardness of silicon dioxide with the advantages of high conductivity and the like of graphene, so that the composite material has high conductivity and high mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a method for preparing silicon dioxide / graphene nanocomposite material by microwave chemical vapor deposition and a product thereof. Background technique [0002] Silica has excellent physical and chemical properties such as high purity, low density, high specific surface area, surface silanol groups can easily form hydrogen bonds of varying strengths with active silane bonds, and exhibits excellent optical, electrical, thermal, and mechanical properties. , magnetic, radiation, absorption and other special properties, due to the special size, structure and performance are widely used in all aspects of modern industrial production and life, for example, in the field of modern optical liquid crystal display, modern medicine, bioengineering, military fields are used At the same time, silica nanoparticles have the advantages of high mechanical stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/26C23C16/511C23C16/513C23C16/517
CPCC23C16/26C23C16/4417C23C16/511C23C16/513C23C16/517
Inventor 孙泰史浩飞冯双龙魏大鹏赵博伟
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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