Multifunctional graphene foam and preparation method thereof

A multi-functional, olefin foam technology, applied in the field of graphene, can solve the problems of thick foam products, limited gas volume, discontinuity, etc., and achieve the effects of good performance stability, simple process and single structure

Pending Publication Date: 2022-02-08
广东墨睿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this preparation method has certain limitations, because it mainly uses high-temperature heat treatment to remove the oxygen-containing functional groups in the graphene oxide film and generate a large amount of gas to "expand" to form a foam structure.
However, the amount of gas produced by this method is very limited, which will directly affect the "expansion" effect and cannot obtain thicker foam products; at the same time, the discontinuity between the graphene layers in this "expansion" structure leads to foam foam The thermal conductivity and electrical conductivity of the product cannot be further optimized

Method used

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  • Multifunctional graphene foam and preparation method thereof
  • Multifunctional graphene foam and preparation method thereof
  • Multifunctional graphene foam and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A graphene oxide coating film with a carbon-to-oxygen ratio of 1.4 (purchased from Yunnan Yuntian Morui Technology Co., Ltd.) was placed in a reaction vessel with an ultrasonic vibration function, hydrazine hydrate was selected as the reaction solution, and the graphene oxide coating film was mixed with The volume ratio of the hydrazine hydrate solution is 1:3; the reaction temperature is kept constant at 40°C, and the working power of the ultrasonic vibration is set to 2000W, and the graphene foam in a relatively wet state is obtained by the reaction. Subsequently, it was placed in a microwave oven, and the working power was set to 60kW. After 3 minutes, a dry graphene foam with a thickness of about 7mm was obtained. After sequentially undergoing high-temperature carbonization at 1200°C and graphitization at 2800°C, as figure 1 As shown in the low-magnification SEM image, the intact porous structure in the graphene foam can be seen, and the pore size distribution is 60...

Embodiment 2

[0032]A graphene oxide coating film with a carbon-to-oxygen ratio of 1.4 (purchased from Yunnan Yuntian Morui Technology Co., Ltd.) was placed in a container containing a hydrazine hydrate reaction solution. During the reaction, magnetic stirring was provided to disturb the solution, and the reaction temperature was kept constant at 40 ℃, the graphene foam in a relatively wet state is obtained by reaction. Subsequently, it was placed in a microwave oven, and the microwave frequency was set to 60kW. After 3 minutes, a dry graphene foam with a thickness of about 5 mm was obtained. After sequentially undergoing high-temperature carbonization at 1200°C and graphitization at 2800°C, as Figure 4 As shown, the microstructure observed by scanning electron microscopy can see a partially intact porous structure, and there is no obvious crosslinking between graphene layers at some positions. This is due to the inconsistency of the overall fluidity of the reaction solution due to magnet...

Embodiment 3

[0034] The graphene oxide coating film material with a carbon-to-oxygen ratio of 2.0 was placed in a reaction vessel with an ultrasonic vibration function, hydrazine hydrate was selected as the reaction solution, and the reaction temperature was kept constant at 60°C to obtain a graphene foam in a relatively wet state. Subsequently, it was placed in a microwave oven, and the microwave frequency was set to 80kW. After 2 minutes, a dry graphene foam with a thickness of about 11mm was obtained. After sequentially undergoing high-temperature carbonization at 1200°C and graphitization at 2800°C, the pore size is 50 μm to 160 μm; the graphene layers are cross-linked to form a network, and effective electrical and heat conduction channels are formed between the pores. The measured thermal conductivity of graphene foam is 145W / m K, and the conductivity can reach 5.5*10 5 S / m.

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Abstract

The invention relates to the technical field of graphene, in particular to multifunctional graphene foam and a preparation method thereof. The preparation method comprises the following steps that a graphene film is soaked in a reaction solution, external force is applied to assist the reaction solution to keep the reaction solution in a flowing state, and after a reduction reaction is conducted for a certain time, microwave drying treatment and heat treatment are sequentially conducted, so that the multifunctional graphene foam is obtained. According to the preparation method provided by the invention, a mode of soaking in a reaction solution to generate gas is adopted, so that a foam product with larger thickness and an intact structure can be obtained. The foam has a porous and fluffy microstructure, and layers are crosslinked together to form a network shape, so that the structural stability of a foam product can be ensured, a very good heat-conducting and electric-conducting channel is provided, and the foam has excellent heat-conducting and electric-conducting functions and the like.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a multifunctional graphene foam and a preparation method thereof. Background technique [0002] Foams with various functions are usually used in electronic products such as mobile phones and computers to solve the problems of heat conduction, conduction and shielding in the products. Usually, these functionalized foams are almost always added to ordinary foams in the form of additives such as conductive and thermally conductive substances to achieve the corresponding product functions; Materials with properties such as electrical conductivity and thermal conductivity are adhered to ordinary foam. The composition of the foam obtained in this way is not single, and the product structure is relatively complex, and the thermal conductivity, electrical conductivity and other properties are easily affected by factors such as uneven mixing and adhesives. [0003] As a new type of car...

Claims

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Application Information

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IPC IPC(8): C01B32/194
CPCC01B32/194C01B2204/24C01B2204/22
Inventor 蔡金明黄文添
Owner 广东墨睿科技有限公司
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