Carbon nanotube foam material with electromagnetic shielding performance, and preparation method and application thereof

A technology of carbon nanotubes and foam materials, applied in the fields of magnetic/electric field shielding, metal material coating technology, electrical components, etc., can solve the problem of reduced mechanical properties of shielding materials, inability to meet the requirements of light weight, and inability to have both mechanical properties, etc. problems, to achieve the effect of expanding mass production, controllable density and thickness, and excellent shielding effectiveness

CN112210766AActive Publication Date: 2021-01-12SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-01-12

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Abstract

The invention discloses a carbon nanotube foam material with electromagnetic shielding performance, and a preparation method and application thereof. The preparation method of the carbon nanotube foammaterial with the electromagnetic shielding performance comprises the following steps: placing carbon nanotube foam into a reaction chamber of chemical vapor deposition equipment; and heating the reaction chamber to 1000-1100 DEG C, and then at least introducing a carbon source and a reducing gas into the reaction chamber, so as to carry out secondary deposition of amorphous carbon on the carbonnanotube foam, thereby obtaining the carbon nanotube foam material with the electromagnetic shielding performance, wherein the carbon nanotube foam material comprises a porous structure composed of a3D network structure with self-supporting capability. According to the invention, the prepared carbon nanotube foam material with the electromagnetic shielding performance has excellent shielding effectiveness, controllable density and thickness, small mass, good flexibility and excellent shielding effectiveness stability; and the preparation process is simple, and batch production can be expanded.
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Description

technical field

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

[0002] With the proliferation of electronic systems and electronic devices, such as wireless networks and personal electronic devices, electromagnetic interference (EMI) has also increased exponentially. The electronic equipment in use today has the characteristics of high power, small size and fast operation speed, but this also means that more electromagnetic waves are emitted, which not only interfere with the operation of adjacent equipment or systems (such as aircraft), but also have a negative impact on Potential health risk to humans. Additionally, issues of data theft and hardware security breaches are prevalent, so better and more secure means ...

Examples

preparation example Construction

[0032] The preparation principle of the present invention is: the present invention utilizes the carbon nanotube foam grown by the floating CVD method, uses ethylene, etc. as the carbon source, and passes through the carrier and the carbon source to perform secondary deposition of amorphous carbon on the original carbon nanotube foam. After secondary deposition, the carbon nanotube foam changed from the original collapsible network structure to a self-supporting 3D network structure. Due to the excellent electrical conductivity of carbon nanotubes, the foam has a high reflection of electromagnetic waves, and the remaining electromagnetic waves enter the interior of the foam. absorption efficiency.

[0033] One aspect of the embodiments of the present invention provides a method for preparing a carbon nanotube foam material with electromagnetic shielding properties, comprising:

[0034] Provide carbon nanotube foam;

[0035] placing the carbon nanotube foam in a reaction cham...

Embodiment 1

[0057] Example 1 as figure 1 As shown, a preparation method of a carbon nanotube foam material with electromagnetic shielding properties comprises the following specific technical steps:

[0058] 1) Raw carbon nanotube foam: the carbon nanotube fibers produced by floating CVD are collected and wound on a collecting shaft.

[0059] 2) Sample preparation: Cut the pristine carbon nanotube foam into regular rectangles with a laser.

[0060] 3) Preparing original carbon nanotube foams with different thicknesses: Prepare spacers with standard sizes (1mm, 2mm, 3mm, 5mm, 10mm), and press the original carbon nanotube foams into different thicknesses respectively.

[0061] 4) Secondary deposition: Put the foam in 3) into the quartz boat, push the quartz boat into the middle of the quartz tube, install 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 1000-1...