Method for quickly preparing high-performance graphene

A graphene and high-performance technology, which is applied in the field of rapid preparation of high-performance graphene, can solve the problems of reduced small molecule gas, reduced stripping rate, and difficulty in removal, and achieves high energy utilization, no thermal inertia, and high heating efficiency high effect

Active Publication Date: 2015-06-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these patents, graphite oxide is usually irradiated with a constant microwave power, and the obtained graphene has poor exfoliation effect, low monolayer rate and specific surface area.
This is because functional groups such as hydroxyl (-OH) and carboxyl (-COOH) in graphite oxide absorb water vapor in the air, and are tightly bound in the form of hydrogen bonds, which are difficult to remove.
In the process of microwave radiation, these adsorbed water first absorb microwaves, thereby reducing the microwave absorption capacity of hydroxyl and carboxyl groups in graphite oxide, resulting in a reduction in the amount of small molecule gas produced, and reducing the driving force for the exfoliation of graphite oxide sheets. And then make its stripping rate reduce, the graphene quality of making is relatively poor, has seriously restricted the application promotion of graphene

Method used

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  • Method for quickly preparing high-performance graphene
  • Method for quickly preparing high-performance graphene
  • Method for quickly preparing high-performance graphene

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Experimental program
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Effect test

Embodiment 1

[0029] Graphite oxide was prepared by the Hummers method, 1 g of the prepared graphite oxide was placed in the reactor, the reactor was pumped to 1000 Pa, and the microwave was turned on, the microwave frequency was 100 MHz, and the power and time were as follows: the first section: 10 W, 10 s; second stage: 100 W, 10 s; third stage: 800 W, 10 s. After three-stage microwave radiation treatment, graphite oxide was successfully exfoliated and reduced to graphene, and the specific surface area of ​​graphene was measured by nitrogen adsorption-desorption method to be 600 m 2 / g.

Embodiment 2

[0031] Graphite oxide was prepared by the improved Hummers method, 1 g of the prepared graphite oxide was placed in the reactor, the reactor was pumped to 0.01 Pa, and the microwave was turned on, the microwave frequency was 500 GHz, and the power and time were as follows: the first section: 60 W , 60 s; second stage: 600 W, 60 s; third stage: 1000 W, 60 s. After three-stage microwave radiation treatment, graphite oxide was successfully exfoliated and reduced to graphene, and the specific surface area of ​​graphene was measured by nitrogen adsorption-desorption method to be 2000 m 2 / g.

Embodiment 3

[0033] Graphite oxide was prepared by the Brodie method, 1 g of the prepared graphite oxide was placed in the reactor, the reactor was pumped to 500 Pa, and the microwave was turned on, the microwave frequency was 800 MHz, and the power and time were as follows: the first section: 20 W, 30 s; second stage: 300 W, 10 s; third stage: 800 W, 15 s. After three-stage microwave radiation treatment, graphite oxide was successfully exfoliated and reduced to graphene, and the specific surface area of ​​graphene was measured by nitrogen adsorption-desorption method to be 820 m 2 / g.

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Abstract

The invention discloses a method for quickly preparing high-performance graphene. The method comprises the steps of putting graphite oxide into a reactor, vacuumizing the reactor, treating the graphite oxide by three-stage gradient microwave radiation, and peeling off the graphite oxide expanded with heat, thus obtaining high-performance graphene. The method has the advantages of high production efficiency, low production cost, high safety and reliability in the operation process and high product quality.

Description

technical field [0001] The invention belongs to a method for rapidly preparing high-performance graphene. Background technique [0002] Graphene is a sp 2 Hybridized carbon atoms form a two-dimensional honeycomb crystal with a thickness of only 0.335 nm, which is considered to be the basic structural unit of fullerenes, carbon nanotubes, and graphite. Graphene is the strongest material in the world (tensile modulus E ≈ 1.01 TPa and ultimate strength σ ≈ 130 GPa), absorbs only 2.3% of light, and is almost completely transparent; the theoretical surface area is as high as 2630 m 2 / g; the thermal conductivity is as high as 5300 W / m K, much higher than that of carbon nanotubes and diamond; its electron mobility exceeds 15000 cm at room temperature 2 / V·s, which is much higher than that of carbon nanotubes or silicon crystals, and its resistivity is only about 10 -6 Ω . cm, which is lower than copper or silver, and is currently the material with the smallest resistivity in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/192
Inventor 陈成猛孔庆强王大力张兴华苏方远李晓明王伟苏小威
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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