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Method for preparing three-dimensional graphene structure through 3D printing

A 3D printing and graphene technology, which is applied in the field of 3D printing to prepare three-dimensional graphene structures, can solve problems affecting the precision of three-dimensional graphene and graphene membrane wrinkles, and achieve the effects of small deformation, fast flow, and improved precision

Active Publication Date: 2021-12-07
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This processing method is simpler than the previous 3D printing technology using sucrose as a carbon source, but there are still many shortcomings
First of all, this processing technology is to grapheneize the front and back (double sides) of the polyimide film, and then use chemical reagents to bond the formed graphene film layer by layer into a three-dimensional entity. Auxiliary, and after molding, it is necessary to remove the binder at a high temperature of 200°C, and then remove the residual polymer at a high temperature of 600°C; secondly, the process of preparing graphene from polyimide film by laser induction , due to the heat shrinkage of the film, the resulting graphene film will be deformed such as wrinkles, which will seriously affect the precision of the formed three-dimensional graphene; finally, it is difficult to form a structure with a complex shape at one time. In order to realize some simple shells, Components such as cavities require additional laser-assisted processing technology; however, three-dimensional graphene structures with complex shapes such as variable cross-sections and hollows are still difficult to achieve

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  • Method for preparing three-dimensional graphene structure through 3D printing
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  • Method for preparing three-dimensional graphene structure through 3D printing

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preparation example Construction

[0057] The preparation method of the present invention can realize the direct preparation of three-dimensional graphene structures of various shapes, and besides solid structures such as simple blocks 3 (a) and columns 3 (b), cavities 3 (c) can also be realized. ), the variable cross-section structure 3(d) and the hollow structure 3(e) and the preparation of three-dimensional structures with complex shapes; the diversity of such macroscopic structures is more conducive to the development and research of the wide application of three-dimensional graphene structures.

[0058] In the present invention, by fixing the laser focal length, scanning speed and printing resolution, and selecting lasers with different powers to induce powders, it is found that during the laser induction process of polymer powders, according to the gradual increase in laser processing power, the products can be divided into: 5 stages: powder particles, PI film, activated carbon film, graphene film, over-ca...

Embodiment 1

[0064] A method for preparing a three-dimensional graphene structure by 3D printing, comprising the following steps:

[0065] S1 substrate processing, fixing the polyimide (PI) paper on the aluminum plate, and laser-induced the PI paper to produce a laser-induced graphene (LIG) substrate;

[0066] S2 in the air atmosphere, spread the polyimide powder evenly on the LIG surface of S1, and use the laser to select the polyimide powder with a power of 1W, a scanning speed of 50.8mm / s and a printing resolution of 500 Sexual graphene;

[0067] S3 continues to spread the powder, on the surface of the formed graphene, carry out the second powder spreading, and the thickness of the powder spreading is 50 μm;

[0068] S4 laser induction, the laser is used to selectively graphenize the polyimide powder with a power of 1W, a scanning speed of 50.8mm / s and a printing resolution of 500 to form a pre-designed single-layer graphene film;

[0069] S5 prints layer by layer, repeatedly repeats st...

Embodiment 2

[0072] S1 substrate processing, fixing the polyimide (PI) paper on the aluminum plate, and laser-induced the PI paper to produce a laser-induced graphene (LIG) substrate;

[0073] In S2, the polyimide powder was evenly spread on the LIG surface of S1 in the air atmosphere, and the polyimide powder was processed by the laser with a power of 1.5W, a scanning speed of 50.8mm / s and a printing resolution of 500. Selective grapheneization;

[0074] S3 continues to spread the powder, on the surface of the formed graphene, carry out the second powder spreading, and the thickness of the powder spreading is 100 μm;

[0075] S4 laser induction, the laser is used to selectively graphenize the polyimide powder with a power of 1.5W, a scanning speed of 50.8mm / s and a printing resolution of 500 to form a pre-designed single-layer graphene film;

[0076] S5 prints layer by layer, repeats steps S4 and S5 repeatedly, and after the cumulative number of powder spreading reaches 70 times, the pri...

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Abstract

The invention provides a method for preparing a three-dimensional graphene structure through 3D printing. According to the method, a laser selective carbonization technology is utilized, polymer powder is taken as a raw material, the polymer powder is directly converted into a graphene structure, and a three-dimensional graphene structure is obtained through layer-by-layer accumulation. In addition, by designing and researching the influence of parameters such as laser processing conditions and powder laying thickness on the forming and performance of the three-dimensional graphene structure and by adopting a post-treatment process, the homogeneity, the specific surface area, the porosity and the electric conductivity of the material are greatly improved; and therefore, the material has higher specific capacitance, energy density and power density when being applied to a supercapacitor electrode material. The efficient and reliable three-dimensional graphene forming method is provided, and the comprehensive performance of the three-dimensional graphene is improved while the appearance of the three-dimensional graphene is maintained.

Description

technical field [0001] The invention belongs to the field of graphene material preparation, and in particular relates to a method for preparing a three-dimensional graphene structure by 3D printing. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial composed of sp 2 A two-dimensional planar structure formed by a network of hybridized carbon atoms. Graphene has excellent properties such as large specific surface area, corrosion resistance, good electrical properties, and extremely high mechanical properties, making it have very large potential applications in the field of materials, flexible electronics, and energy storage. As a three-dimensional macroscopic material of graphene, three-dimensional graphene not only has the excellent characteristics of two-dimensional graphene, but also has a large specific surface area and a special conductive network. These properties make it widely used in energy storage, catalysis, environmental protection, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184B33Y10/00B33Y70/00H01G11/86H01G11/26H01G11/36
CPCC01B32/184B33Y10/00B33Y70/00H01G11/86H01G11/26H01G11/36Y02E60/13
Inventor 罗斯达刘福高燕
Owner BEIHANG UNIV
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