Method for preparing carbon nano spiral electromagnetic wave absorbent coated by magnetic material

A magnetic material and carbon nanotechnology, applied in chemical instruments and methods, metal material coating technology, gaseous chemical plating, etc., can solve the problems of low chemical activity, small carbon nanohelix size, complex process, etc., and achieve high-efficiency absorption wave material, achieve impedance matching, and simple process

Active Publication Date: 2013-03-13
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is basically non-magnetic, so it needs to be combined with a magnetic material to make it have strong absorption properties.
Many researchers have carried out research on magnetic materials composite electrical loss materials, but carbon nanohelixes have small size, low chemical activity and many surface holes. Traditional electroplating, electroless plating and sol-gel methods have great impact on coating quality and thickness. It is difficult to carry out effective control, and the process is complicated, with many steps, and no great progress has been made

Method used

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  • Method for preparing carbon nano spiral electromagnetic wave absorbent coated by magnetic material
  • Method for preparing carbon nano spiral electromagnetic wave absorbent coated by magnetic material
  • Method for preparing carbon nano spiral electromagnetic wave absorbent coated by magnetic material

Examples

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Embodiment 1

[0036] Copper tartrate precursor was pyrolyzed at 250oC to obtain copper nanoparticles with a diameter of about 50 nm, and acetylene gas was introduced to catalyze acetylene at 250oC to synthesize helical nanofibers. The helical nanofibers were heat-treated in an inert gas at 900oC for 1 hour to obtain a carbon nanohelix with a uniform helical structure and a direct diameter of 100 nm. Disperse the carbon nanohelices on the quartz sheet, dry and transfer to the reaction chamber of the atomic layer deposition equipment, and set the ALD deposition parameters as follows:

[0037] Reaction temperature 150 oC; Reaction source: Al(CH 3 ) 3 and H 2 O is the precursor, both temperatures are at room temperature; carrier gas: 10 sccm high-purity nitrogen; single-cycle pulse, hold and purge time: first H 2 The O pulse is 0.1 s, the hold time is 5 s, and the purge time is 10 s; then Al(CH 3 ) 3 The pulse is 0.015 s, the hold time is 5 s, and the purge time is 10 s; continuous 100 cyc...

Embodiment 2

[0042] Copper tartrate precursor was pyrolyzed at 250oC to obtain copper nanoparticles with a diameter of about 50 nm. Acetylene gas was introduced to catalyze acetylene at 250oC to synthesize helical nanofibers. The helical fiber was heat-treated in an inert gas at 900oC for 1 hour to obtain a carbon nanohelix with a uniform helical structure and a direct diameter of 100nm. Disperse the carbon nanohelices on the quartz sheet, dry and transfer to the reaction chamber of the atomic layer deposition equipment, and set the ALD deposition parameters as follows:

[0043] Reaction temperature 200 oC; Reaction source: Al(CH 3 ) 3 and H 2 O is the precursor, and the temperature of the precursor is room temperature; carrier gas: 30 sccm high-purity nitrogen; single-cycle pulse, gas holding and purging time: first perform H 2 The O pulse was 0.3 s, the hold time was 6 s, and the purge time was 12 s; then Al(CH 3 ) 3 The pulse is 0.1 s, the hold time is 6 s, and the purge time is 12...

Embodiment 3

[0048] Copper tartrate precursor was pyrolyzed at 250oC to obtain copper nanoparticles with a diameter of about 50 nm. Acetylene gas was introduced to catalyze acetylene at 250oC to synthesize helical nanofibers. The helical fiber was heat-treated in an inert gas at 900oC for 1 hour to obtain a carbon nanohelix with a uniform helical structure and a direct diameter of 100nm. Disperse the carbon nanohelices on the quartz sheet, dry and transfer to the reaction chamber of the atomic layer deposition equipment, and set the ALD deposition parameters as follows:

[0049] Reaction temperature 250 oC; Reaction source: Al(CH 3 ) 3 and H 2 O is the precursor, and the temperature of the precursor is room temperature; carrier gas: 50 sccm of high-purity nitrogen; single-cycle pulse, gas holding and purging time: first carry out H 2 The O pulse was 0.5 s, the hold time was 7 s, and the purge time was 15 s; then Al(CH 3 ) 3 The pulse is 0.4 s, the hold time is 7 s, and the purge time ...

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Abstract

The invention discloses a method for preparing a carbon nano spiral electromagnetic wave absorbent coated by a magnetic material. The method comprises the following steps of: pyrolyzing copper carboxylate at a high temperature to obtain copper nano particles, and carrying out a chemical vapor deposition reaction to obtain a carbon nano spiral by using the copper nano particles as a catalyst and acetylene as a carbon source; dispersing the carbon nano spiral on a quartz plate, putting the quartz plate into a reaction cavity of an atom layer deposition device and implementing the deposition of an Al2O3 protection film; directly implementing the deposition of a metal oxide Fe2O3 or NiO to the carbon nano spiral protected by an aluminum oxide film, reducing the carbon nano spiral product coated by Fe2O3 or NiO in a mixture atmosphere of H2 and N2, thereby obtaining a carbon nano spiral coated by a magnetic Fe3O4 or Ni coating. The method disclosed by the invention has the advantages of simple process and easiness for control.

Description

technical field [0001] The invention belongs to a method for preparing an electromagnetic wave absorbing material, and in particular relates to a method for preparing a magnetic material-coated carbon nano-helical electromagnetic wave absorbing material by using atomic layer deposition (ALD) technology. Background technique [0002] Carbon nanohelix is ​​a typical chiral material, which has many advantages such as light weight, good conductivity and good stability, and is a good choice for designing new wave-absorbing materials. However, according to electromagnetic theory, a good absorbing material must have two key points, namely impedance matching and attenuation characteristics. Therefore, multi-component compounding of two types of materials and adjusting the electromagnetic parameters under matching conditions as much as possible is an effective way to improve absorption. Carbon nanohelixes have good electrical conductivity and are electrical loss materials. There hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/44C23C16/40C09K3/00
Inventor 覃勇王桂振高哲陈朝秋
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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