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Method for macroscopically preparing high-quality graphene by using bio-mineralized material

A technology of biomineralization and graphene, applied in the field of materials, can solve the problems of unachieved graphene output, and achieve the effects of high yield, strong conductivity and high efficiency

Inactive Publication Date: 2015-02-25
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has not reached the level of the previous two preparation methods in terms of graphene yield

Method used

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  • Method for macroscopically preparing high-quality graphene by using bio-mineralized material
  • Method for macroscopically preparing high-quality graphene by using bio-mineralized material
  • Method for macroscopically preparing high-quality graphene by using bio-mineralized material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, utilize diatomite to prepare graphene powder in large quantities as growth substrate

[0040] 1) Place diatomite in an atmospheric pressure chemical vapor deposition reaction furnace and pre-calcine at 800°C for 1 hour in an air atmosphere to remove residual organic matter and crystal water to obtain a silicon oxide phase with a stable structure;

[0041] 2) Heating the equipment to 1000°C at a heating rate of 5°C / min, and then passing methane under the protection of argon for reaction, methane is chemically adsorbed on the surface of pre-calcined diatomite as a gaseous reaction precursor, forming Nucleation and growth, the reaction time is 360min, the percentage of carbon source gas methane in the total volume of carbon source and carrier gas is 0.5%;

[0042] 3) The product after the reaction is added to a molar concentration of 0.1mol L -1 Soak in hydrofluoric acid or hydrofluoric acid / ethanol mixed solution for 600min, dissolve and corrode the diatomi...

Embodiment 2

[0046] Example 2, using shells as growth substrates to prepare graphene bionic macroscopic materials

[0047] 1) Place the scallop shell in an atmospheric pressure chemical vapor deposition reaction furnace and pre-calcine at 1000°C for 5 hours in an air atmosphere to remove residual organic matter and crystal water, and obtain a porous and structurally stable calcium oxide phase through pyrolysis;

[0048] 2) Continue to heat the reaction furnace to 1300°C at a heating rate of 100°C / min, and then feed methane under the protection of argon for reaction. Nucleation and growth, the reaction time is 10 minutes, the percentage of carbon source gas methane in the total volume of carbon source and carrier gas is 10%;

[0049] 3) the product after the reaction is placed in a molar concentration of 2mol L -1 Soak in the hydrochloric acid solution for 15 minutes, dissolve and corrode the shell material, and obtain the graphene macroscopic body imitating the shell shape soaked in the l...

Embodiment 3

[0052] Embodiment 3, utilize phytolith powder to prepare graphene powder in large quantities as growth substrate

[0053] 1) Put the phytolith powder in a low-pressure (vacuum degree of 133 Pa) chemical vapor deposition reaction furnace and pre-calcine at 800°C for 1 hour in an air atmosphere to remove residual organic matter and crystal water to obtain a silicon oxide phase with a stable structure;

[0054] 2) Continue to heat the reaction furnace to 900°C at a heating rate of 10°C / min, and then feed ethylene under the protection of nitrogen for reaction. Nucleation and growth, the reaction time is 120min, the carbon source gas ethylene accounts for 10% of the total volume of carbon source and carrier gas;

[0055] 3) The product after the reaction is added to a molar concentration of 1mol L -1 Soak in hydrofluoric acid or hydrofluoric acid / ethanol mixed solution for 600min, dissolve and corrode the silica powder, and obtain graphene in the liquid phase;

[0056] 4) After r...

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Abstract

The invention discloses a method for macroscopically preparing high-quality graphene by using bio-mineralized material. The method comprises the following steps: 1) calcining bio-mineralized material in chemical vapor deposition equipment and cooling to room temperature after calcination; 2) when the temperature of the equipment in the step 1) rises to 500-1300 DEG.C, introducing a carbon source under the protection of inert atmosphere to perform chemical vapor deposition reaction, soaking the reaction product in a non-oxidizing acid solution after the chemical vapor deposition reaction is finished, then cleaning and drying to obtain the graphene. The method disclosed by the invention is simple in process, high in efficiency, wide in raw material resource, and suitable for industrial continuous production. The graphene prepared by the invention is capable of duplicating the morphology of the used bio-mineralized material, and has characteristics of high degree of crystallinity, controllable layer number, high yield and strong conductivity; the graphene can be used for the field of transparent conducive films, flexible electronic apparatuses, new energy apparatuses and rubber composite superstrong material.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for preparing high-quality graphene in large quantities using biomineralized materials. Background technique [0002] Graphene is a single-layer carbon atom structure material arranged periodically in hexagonal symmetry. This long-range ordered conjugated carbon nanomaterial has many exotic electrical, optical, mechanical, thermal and chemical properties, such as high mobility (200000cm 2 v -1 the s -1 ), high transmittance (about 97.7%), high strength (Young's modulus about 1TPa), high thermal conductivity (about 5000Wm -1 K -1 ) and high chemical stability, etc., thus opening up a broad space for the development of new electronics, optoelectronics, energy storage and sensor devices, and has attracted extensive attention from the scientific and industrial circles. In particular, its good light transmission, flexibility and conductivity make graphene expected to replace the e...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 刘忠范陈珂史刘嵘李聪
Owner PEKING UNIV
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