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Absorption frequency adjustable microwave absorption material and preparation method thereof

A microwave absorbing material and absorbing frequency technology, applied in electrical components, antennas, magnetic field/electric field shielding, etc., can solve the problems of inability to effectively form a conductive network and reduce microwave absorbing performance, and achieve good microwave absorbing performance and absorbing frequency. The effect of adjusting and improving the microwave absorption performance

Active Publication Date: 2014-12-24
FUDAN UNIV
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Problems solved by technology

[7] It is crucial for the preparation of high-performance absorbing materials for carbon nanotubes to reach the permeation threshold in the polymer matrix [8], but because carbon nanotubes Large aspect ratio and specific surface area are very prone to agglomeration and entanglement in the polymer matrix, so that the conductive network cannot be effectively formed, thus greatly reducing its absorbing performance

Method used

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  • Absorption frequency adjustable microwave absorption material and preparation method thereof
  • Absorption frequency adjustable microwave absorption material and preparation method thereof
  • Absorption frequency adjustable microwave absorption material and preparation method thereof

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Embodiment Construction

[0026] First, the preparation of aligned carbon nanotube films

[0027] Fe (thickness 1~2nm) / Al 2 o 3 (thickness of 10±2 nm) is the catalyst, ethylene is the carbon source, and the mixed gas of argon and hydrogen is the gas phase carrier, among which, Al 2 o 3 As a buffer layer, Fe is used as a catalyst, and a nanometer-thick film is deposited on a silicon wafer by an electron beam evaporation coating device; chemical vapor deposition is used, ethylene is used as a carbon source, and argon and hydrogen are used as a carrier gas. Synthesize vertically grown carbon nanotube arrays on Si substrates; the ethylene flow rate is 180-300 sccm, the argon flow rate is 390-650 sccm, and the hydrogen flow rate is 20-50 sccm, grown in a tube furnace for 10-180 min, namely A vertically grown carbon nanotube array is obtained. The details of synthesis and self-assembly can refer to existing literature reports. Use a polytetrafluoroethylene roller with a smooth surface to roll the carbo...

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Abstract

The invention belongs to the technical field of preparation of microwave absorption materials, and particularly relates to an absorption frequency adjustable microwave absorption material and a preparation method thereof. A monolayer oriented carbon nano tube film of the microwave absorption material is composed by height oriented carbon nano tubes arrayed in the same direction, and the surface density is 1.97gm<-2>. A series of absorption frequency adjustable microwave absorption materials are acquired through change of an included angle (0-90 degrees) of two oriented carbon nano tube films. Iron and polyaniline are composited on the oriented carbon nano tubes through electron beam evaporation and electrochemical polymerization to further improve microwave absorption performance of the material. Through adjustment of the included angle of the two oriented carbon nano tube films, adjustment of microwave absorption frequency is realized; through increase of the number of the oriented carbon nano tube films or composition with the iron and the polyaniline, microwave absorption performance is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of microwave absorbing materials, and in particular relates to a microwave absorbing material with adjustable absorption frequency and a preparation method thereof. Background technique [0002] For a long time, adjusting the absorption frequency has been a crucial but challenging problem in the field of microwave absorption. [1-3] In precision electronic instruments, when the frequency of external electromagnetic waves changes, the absorbing material needs to adjust the absorbing frequency accordingly to protect the stable operation of the internal instrument; in the military field, electromagnetic waves of different frequencies are often used for reconnaissance targets, which also requires absorbing materials Can effectively control the absorption frequency. Although researchers have conducted extensive and in-depth research on adjusting the absorbing frequency, changing the thickness of t...

Claims

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Application Information

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IPC IPC(8): H05K9/00H01Q17/00
Inventor 彭慧胜车仁超孙浩
Owner FUDAN UNIV
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