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A kind of silica/graphene three-dimensional composite material and its preparation method and application

A technology of silicon dioxide and composite materials, applied in the directions of silicon dioxide, graphene, silicon oxide, etc., can solve the problems of high cost, low force-sensitive performance, weak force-sensitivity, etc., and achieve high deformation recovery ability, equipment Less demanding, high mechanical recovery effects

Active Publication Date: 2020-01-21
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

[0003] At present, there are two main methods for the preparation of three-dimensional graphene materials reported in some literatures: one is to grow graphene on nickel foam by CVD, and then etch to obtain three-dimensional graphene materials. Low, and the obtained three-dimensional graphene material has disadvantages such as poor mechanical strength, weak force sensitivity, and poor recovery
The second is the non-doped hydrothermal reduction self-assembly method. The three-dimensional graphene material obtained by this method has poor molding effect, poor mechanical properties, and low force sensitivity.

Method used

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  • A kind of silica/graphene three-dimensional composite material and its preparation method and application
  • A kind of silica/graphene three-dimensional composite material and its preparation method and application
  • A kind of silica/graphene three-dimensional composite material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0039] Preparation of silica / graphene composites

[0040] Put 0.1g of silicon dioxide particles into the quartz boat, then place the quartz boat in the constant temperature zone of the horizontal tubular furnace, pass in argon to remove the air in the horizontal tubular furnace, and raise the temperature to 1100°C under normal pressure, Stop the feeding of argon now and feed ethane at a rate of 20 sccm, after keeping for 13min, stop the feeding of ethane and feed argon again, down to room temperature, make silicon dioxide / graphene composite, The carbon content in the composite is 21wt%, and the equivalent particle size is 30nm.

Embodiment 2

[0042] Preparation of silica / graphene composites

[0043] Put 0.1g of silicon dioxide particles into the quartz boat, then place the quartz boat in the constant temperature zone of the horizontal tubular furnace, pass in argon to remove the air in the horizontal tubular furnace, and raise the temperature to 1000°C under normal pressure, Stop the feeding of argon now and feed methane at a rate of 15 sccm, after keeping for 20min, stop the feeding of methane and feed argon again, down to room temperature, make silicon dioxide / graphene composite, the composite The carbon content in the product is 50wt%, and the equivalent particle size is 35nm.

Embodiment 3

[0045] Preparation of silica / graphene composites

[0046] Put 0.1g of silicon dioxide particles into the quartz boat, then place the quartz boat in the constant temperature zone of the horizontal tubular furnace, pass nitrogen gas to exclude the air in the horizontal tubular furnace, and raise the temperature to 950°C under normal pressure. When stopping the feed of nitrogen and feed propyne at a rate of 12 sccm, after keeping for 30min, stop the feed of propyne and feed nitrogen again, down to room temperature, to obtain a silicon dioxide / graphene composite, the composite The middle carbon content is 60wt%, and the equivalent particle size is 40nm.

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Abstract

The invention relates to a silicon dioxide / graphene three-dimensional composite material and a preparation method and application thereof and belongs to the technical field of function materials. Thecomposite material comprises a three-dimensional graphene foam substrate and a silicon dioxide / graphene compound evenly dispersed and loaded on the substrate, and with silicon dioxide particles as a core and graphene as a shell, each silicon dioxide / graphene compound is of a core-shell structure. The preparation method of the material comprises the steps that firstly, graphene is precipitated on the surfaces of the silicon dioxide particles through a chemical vapor deposition method, the silicon dioxide / graphene compound is prepared, then the compound is dispersed in a graphene oxide dispersion solution for one-step in-situ self-assembly, and the silicon dioxide / graphene three-dimensional composite material is prepared. The composite material has excellent mechanical strength, high force sensitivity, high conductivity and high dynamics restoration performance. The method is simple in operation, low in requirements for equipment and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a silica / graphene three-dimensional composite material and its preparation method and application Background technique [0002] Graphene is made of sp 2 The honeycomb crystal structure formed by the close arrangement of hybridized carbon atoms has a thickness of only 0.34nm and theoretically has excellent mechanical, thermal, optical and electrical properties. Among them, in terms of mechanics, its fracture strength is 125GPa, Young's modulus is 1.1TPa, and its strength is 100 times that of ordinary steel; in terms of heat, its thermal conductivity can reach 5000W / (m K), which is 10 times that of copper at room temperature. In terms of optics, its visible light transmittance is 97.7%, almost transparent; in terms of electricity, the electron mobility of graphene reaches 20000cm 2 / (v s), the conductivity can reach 106S / m, which is the material with the best conduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/182C01B32/186C01B33/12
Inventor 孙泰史浩飞魏大鹏赵博伟
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI