Metal-carbon nanotube foam composite material as well as preparation method and application thereof

Abstract

The invention discloses a metal-carbon nanotube foam composite material as well as a preparation method and an application thereof. The preparation method comprises the following steps: carrying out secondary deposition of amorphous carbon on original carbon nanotube foam to obtain a deposited carbon nanotube foam material, putting the deposited carbon nanotube foam material and a metal precursorinto a reaction chamber of chemical vapor deposition equipment, and distributing the metal precursor at the upstream of the carbon nanotube foam material; and heating the reaction chamber to 1050-1150DEG C, and then at least introducing a reducing gas into the reaction chamber to thermally reduce the metal precursor, thereby uniformly loading metal particles on the surface and inside of the deposited carbon nanotube foam material to obtain the metal-carbon nanotube foam composite material. The metal-carbon nanotube foam composite material disclosed by the invention has excellent shielding effectiveness, certain mechanical strength, flexibility and compression stability and low density, and has a wide application prospect in preparation of elastic electromagnetic shielding materials.

Description

technical field

[0001] The invention relates to a preparation method of an electromagnetic shielding material, in particular to an elastic metal-loaded carbon nanotube foam composite material with electromagnetic shielding performance, a preparation method and application thereof, and belongs to the technical field of composite materials. Background technique

[0002] The arrival of the fifth-generation wireless system (5G) era and the continuous development of electronic equipment have brought great convenience to human life. At the same time, electromagnetic information leakage, electromagnetic environmental pollution and electromagnetic interference (EMI) have also appeared along with electronic equipment. , causing great harm to human life (S.Gupta, N.-H.Tai, Carbon materials and theircomposites for electromagnetic interference shielding effectiveness in X-band, Carbon 152(2019) 159-187.). Therefore, high-performance electromagnetic wave shielding materials are becoming ...

Examples

preparation example Construction

[0038] The preparation principle of the present invention is that the metal-carbon nanotube foam composite material of the present invention is synthesized by a chemical vapor deposition (CVD) process, and then reinforced by amorphous carbon (AC) and loaded with metal by a secondary CVD process. Without using any polymer matrix, the foam is flexible and compressively stable because the AC has welded the junctions between adjacent CNTs. At the same time, AC can bridge the electron transport path between CNTs, thereby enhancing the electrical conductivity and EMI shielding performance. The density of the metal-carbon nanotube foam composite is about 0.02-0.04g / cm 3 , about 60 times smaller than commonly used solid polymer composites. Overall, this invention can provide guidance for the manufacture of ultra-light and flexible EMI shielding materials, paving the way for the production of next-generation EMI shielding devices.

[0039] Among them, chemical vapor deposition (CVD) ...

Embodiment 1

[0081] Example 1 as Figure 1-Figure 3 As shown, the specific technical steps of a preparation method of a carbon nanotube foam composite material loaded with metal nickel having elasticity and electromagnetic shielding properties are as follows:

[0082] 1) Raw carbon nanotube foam: the carbon nanotube fibers produced by floating CVD are collected and wound on a collecting shaft.

[0083] 2) Sample preparation: Cut the pristine carbon nanotube foam into regular rectangles with a laser.

[0084] 3) Secondary deposition: see figure 1 As shown, put the original carbon nanotube foam in step 2) into the quartz boat, push the quartz boat into the middle of the quartz tube, fix the flanges at both ends of the quartz tube, and then pass argon gas to remove the air in the quartz tube. The flow rate of argon gas is 200-250 sccm, the temperature is raised to 1000-1100 °C at a rate of 10 °C / min, and the hydrogen and ethylene valves are opened, and the flow rates are 120-160 sccm and 60...

technical field

[0001] The invention relates to a preparation method of an electromagnetic shielding material, in particular to an elastic metal-loaded carbon nanotube foam composite material with electromagnetic shielding performance, a preparation method and application thereof, and belongs to the technical field of composite materials. Background technique

[0002] The arrival of the fifth-generation wireless system (5G) era and the continuous development of electronic equipment have brought great convenience to human life. At the same time, electromagnetic information leakage, electromagnetic environmental pollution and electromagnetic interference (EMI) have also appeared along with electronic equipment. , causing great harm to human life (S.Gupta, N.-H.Tai, Carbon materials and theircomposites for electromagnetic interference shielding effectiveness in X-band, Carbon 152(2019) 159-187.). Therefore, high-performance electromagnetic wave shielding materials are becoming ...

Examples

preparation example Construction

[0038] The preparation principle of the present invention is that the metal-carbon nanotube foam composite material of the present invention is synthesized by a chemical vapor deposition (CVD) process, and then reinforced by amorphous carbon (AC) and loaded with metal by a secondary CVD process. Without using any polymer matrix, the foam is flexible and compressively stable because the AC has welded the junctions between adjacent CNTs. At the same time, AC can bridge the electron transport path between CNTs, thereby enhancing the electrical conductivity and EMI shielding performance. The density of the metal-carbon nanotube foam composite is about 0.02-0.04g / cm 3 , about 60 times smaller than commonly used solid polymer composites. Overall, this invention can provide guidance for the manufacture of ultra-light and flexible EMI shielding materials, paving the way for the production of next-generation EMI shielding devices.

[0039] Among them, chemical vapor deposition (CVD) ...

Embodiment 1

[0081] Example 1 as Figure 1-Figure 3 As shown, the specific technical steps of a preparation method of a carbon nanotube foam composite material loaded with metal nickel having elasticity and electromagnetic shielding properties are as follows:

[0082] 1) Raw carbon nanotube foam: the carbon nanotube fibers produced by floating CVD are collected and wound on a collecting shaft.

[0083] 2) Sample preparation: Cut the pristine carbon nanotube foam into regular rectangles with a laser.

[0084] 3) Secondary deposition: see figure 1 As shown, put the original carbon nanotube foam in step 2) into the quartz boat, push the quartz boat into the middle of the quartz tube, fix the flanges at both ends of the quartz tube, and then pass argon gas to remove the air in the quartz tube. The flow rate of argon gas is 200-250 sccm, the temperature is raised to 1000-1100 °C at a rate of 10 °C / min, and the hydrogen and ethylene valves are opened, and the flow rates are 120-160 sccm and 60...

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