Three-dimensional graphene foam as well as preparation method and application thereof

A technology of graphene foam and graphene powder, which is applied in graphene, chemical instruments and methods, and other chemical processes, and can solve problems such as time-consuming, easy-to-collapse skeletal structures, etching or pyrolysis processes, and weak physical interactions , to achieve the effect of simple experimental equipment, shortening the preparation cycle, and facilitating large-scale preparation

Active Publication Date: 2017-05-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the weak physical interaction between graphene sheets, the skeleton structure of graphene foam is easy to collapse during the template removal process, and the etching or pyrolysis process is also time-consuming, resulting in great limitations of this method.
In addition, taking the CVD method as an example, it requires high equipment and has problems such as difficult etching of the template.

Method used

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  • Three-dimensional graphene foam as well as preparation method and application thereof
  • Three-dimensional graphene foam as well as preparation method and application thereof
  • Three-dimensional graphene foam as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) The graphite oxide prepared by the chemical oxidation method was placed in an ordinary oven for thermal exfoliation and reduction, the thermal exfoliation temperature was 200° C., and the exfoliation time was 5 min. Finally, black fluffy graphene powder is obtained.

[0038] (2) 0.66g of this graphene powder is packed into a size of φ under the pressure of 54kPa 外 5cm×φ 内 Put it in a graphite crucible of 4cm×5cm, and place it in a high-temperature furnace at 1500°C for 1 hour in a high-purity nitrogen atmosphere to obtain a density of 19mg / cm 3 、BET specific surface area is 338m 2 / g of three-dimensional graphene foam. The appearance of the obtained three-dimensional graphene foam is as follows figure 1 As shown, the scanning electron microscope morphology is shown in figure 2 As shown, the obtained three-dimensional graphene foam not only has good compressive properties and mechanical strength, but also has a continuous worm-like skeleton (graphene aggregates...

Embodiment 2

[0045] Compared with Example 1, the difference is only that in step (2), the graphene powder is placed in a high-temperature furnace and processed in a high-purity nitrogen atmosphere at 1000°C for 1h, and the structure of the three-dimensional graphene foam obtained is similar to that of Example 1, but Density drops to 11mg / cm 3 , BET specific surface area increased to 508m 2 / g.

[0046] The three-dimensional graphene foam is encapsulated with epoxy resin to obtain a graphene foam composite material, the quality of the three-dimensional graphene foam is 0.8% of the graphene foam composite material, and then the sample is cut to a thickness of 2.0mm.

Embodiment 3

[0052] Compared with Example 1, the only difference is that in step (2), the graphene powder is placed in a high-temperature furnace and processed in a high-purity nitrogen atmosphere at 2200 ° C for 1 h, and the structure of the three-dimensional graphene foam obtained is similar to that of Example 1, But the density increased to 34mg / cm 3 , BET specific surface area reduced to 108m 2 / g.

[0053] The three-dimensional graphene foam is encapsulated with epoxy resin to obtain a graphene foam composite material, the quality of the three-dimensional graphene foam is 3.3% of the graphene foam composite material, and then the sample is cut to a thickness of 2.0 mm.

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Abstract

The invention discloses three-dimensional graphene foam as well as a preparation method and application thereof. The preparation method comprises the following concrete steps: taking low-temperature heat-peelable graphene powder as a raw material, and carrying out a one-step sintering process, so that further reduction and defect repairing on graphene can be realized, and two-dimensional graphene powder also can be assembled into three-dimensional graphene foam. The prepared ultra-light graphene foam has ultrahigh electromagnetic shielding efficiency and ultrahigh adsorbing capability on an organic solvent, and has important application in the fields of electromagnetic shielding and organic pollutant adsorption. By utilizing the preparation method, simple and macroscopic quantity preparation of high-performance and multifunctional graphene foam can be realized, so that the preparation method has great market prospects.

Description

technical field [0001] The invention belongs to the field of graphene foam materials, in particular to a three-dimensional graphene foam and its preparation method and application. Background technique [0002] Graphene has received extensive attention from all walks of life since its discovery. Graphene is composed of single layer sp 2 An ideal two-dimensional nanocrystal with a regular honeycomb structure composed of hybridized carbon atoms. This kind of nanomaterial not only has the incomparable mechanical strength of traditional nanomaterials, but also has excellent physical and chemical properties such as electricity, heat and light. Using graphene as the basic building block to prepare graphene-based three-dimensional macroscopic aggregates is an effective way to utilize and deliver the versatility of this molecular-level thickness material at the macroscopic scale. [0003] Graphene foam is a typical graphene-based three-dimensional macro-aggregate. Its internal th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/194B01J20/20B01J20/30
CPCB01J20/20C01B2204/32C01P2004/03C01P2004/30C01P2006/10C01P2006/17C01P2006/40C01P2006/42
Inventor 郑文革沈斌李洋
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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