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A method for preparing graphene powder by light wave expansion and exfoliation

A graphene powder and expanded graphite technology, applied in the field of graphene, can solve the problems of low product quality and easy agglomeration, and achieve the effects of not easy to agglomerate, low energy consumption, and good peeling effect

Active Publication Date: 2018-10-16
山东希诚新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the graphene oxide obtained by ultrasonic exfoliation of graphite oxide is easy to agglomerate in the subsequent solution reduction or thermal reduction, resulting in the final product mainly being graphene microplatelets with more than 10 layers, and few-layer graphene with less than 10 layers. The quantity is small, resulting in low product quality

Method used

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  • A method for preparing graphene powder by light wave expansion and exfoliation
  • A method for preparing graphene powder by light wave expansion and exfoliation
  • A method for preparing graphene powder by light wave expansion and exfoliation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The process of preparing graphene powder by light wave expansion and exfoliation is as follows:

[0028] Put the graphite oxide powder sample into a square heat preservation box and spread it out with a thickness of 0.1 cm. After that, place the halogen lamp on the mouth of the heat preservation box to form a closed environment. After that, set the distance between the powder material and the halogen lamp tube to 4cm, and the power density of the halogen lamp to 6500W / m 2 . Turn on the halogen lamp and irradiate the sample for 5s to obtain expanded and exfoliated expanded graphene.

[0029] Put the expanded graphene into a tube furnace, under the protection of 99.9% nitrogen, increase the temperature at a heating rate of 2°C / min, keep it at 800°C for 1 hour, and naturally cool to room temperature to obtain a few layers of graphene powder. The specific surface area of ​​graphene powder is 400m 2 / g, the number of slices is 4-6, and the conductivity is 40S / cm.

Embodiment 2

[0031] Put the graphite oxide powder sample into a square heat preservation box and spread it out with a thickness of 0.2 cm. After that, place the halogen lamp on the mouth of the heat preservation box to form a closed environment. After that, set the distance between the powder material and the halogen lamp tube to 5cm, and the power density of the halogen lamp to 8000W / m 2 . Turn on the halogen lamp and irradiate the sample for 20 seconds to obtain expanded and exfoliated expanded graphene.

[0032] Put the expanded graphene into a tube furnace, under the protection of 99.9% nitrogen, heat up at a heating rate of 3°C / min, keep it at 900°C for 1 hour, and naturally cool to room temperature to obtain a few layers of graphene powder. The specific surface area of ​​the graphene powder is 422m 2 / g, the number of slices is 4-8, and the conductivity is 53S / cm.

[0033] figure 1 In this example, the X-ray diffraction pattern of graphene obtained after light wave expansion and exfoliat...

Embodiment 3

[0035] Put the graphite oxide powder sample into a square heat preservation box and spread it out with a thickness of 0.3 cm. After that, place the halogen lamp on the mouth of the heat preservation box to form a closed environment. After that, set the distance between the powder material and the halogen lamp tube to 7cm, and the power density of the halogen lamp to 10000W / m 2 . Turn on the halogen lamp and irradiate the sample for 30 s to obtain expanded and exfoliated graphene.

[0036] Put the expanded graphene into a tube furnace, under the protection of 99.9% nitrogen, increase the temperature at a heating rate of 4°C / min, keep it at 1000°C for 2h, and cool to room temperature to obtain a few layers of graphene powder. The specific surface area of ​​graphene powder is 510m 2 / g, the number of slices is 3-6, and the conductivity is 102S / cm.

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Abstract

The invention discloses a method for preparing graphene powder through light wave puffing stripping. The method comprises the following steps of 1, selecting graphite oxide powder or expansible graphite powder as raw materials; 2, flatly spreading the raw materials in a heat insulation container; 3, installing an irradiation lamp in the heat insulation container; irradiating the raw materials by the lamplight according to the preset irradiation power density, the irradiation distance and the irradiation time to obtain expanded graphene subjected to puffing stripping; 4, putting the expanded graphene obtained in the third step into a heating furnace; introducing inert gas into the heating furnace for protection; heating the expanded graphene in the heating furnace to the set temperature according to the preset temperature rise speed; then, performing heat insulation according to the set time; 5, after heat insulation, performing natural cooling to room temperature to obtain graphene. The method has the advantages that the graphene powder in great quantity can be prepared at high efficiency; the energy consumption of the method is low.

Description

Technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing graphene powder by light wave expansion and exfoliation. Background technique [0002] Graphene is a kind of sp 2 The hybrid orbitals are composed of a two-dimensional carbon material with a single carbon atom thickness in a hexagonal honeycomb lattice arrangement. Graphene is the thinnest and hardest nanomaterial known in the world. It is almost completely transparent and only absorbs 2.3% of light. The thermal conductivity is as high as 5300 W / m•K, which is higher than that of carbon nanotubes and diamond, and the carrier concentration is as high as 1013cm -2 , The electron mobility exceeds 15000cm at room temperature 2 / V•s, which is higher than carbon nanotubes or silicon crystals. The resistivity of graphene is only about 10 -6 Ω•cm, lower than copper or silver, is the material with the smallest resistivity in the world. In recent years, graphene has gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/192
CPCC01B2204/04C01B2204/22C01B2204/32Y02P20/10
Inventor 陈欣李华锋董贺存张兵单体金
Owner 山东希诚新材料科技有限公司