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Iron oxide-nitrogen doped carbon micro-tube composite wave-absorbing material and preparation method thereof

A composite absorbing material and iron oxide technology, applied in the field of absorbing materials, can solve the problems of high density of absorbing materials, narrow absorbing frequency range, poor absorbing performance, etc., to overcome the problems of high density and excellent absorbing performance. , the effect of good application prospects

Active Publication Date: 2020-02-14
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] In view of this, the object of the present invention is to provide an iron oxide-nitrogen-doped carbon microtube composite absorbing material and its preparation method, which solves the problems of high density, narrow absorbing frequency range and absorbing problems of traditional iron oxide absorbing materials. The problem of poor performance, and the problem of cumbersome operation during the preparation of carbon-iron oxide composite materials

Method used

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  • Iron oxide-nitrogen doped carbon micro-tube composite wave-absorbing material and preparation method thereof
  • Iron oxide-nitrogen doped carbon micro-tube composite wave-absorbing material and preparation method thereof
  • Iron oxide-nitrogen doped carbon micro-tube composite wave-absorbing material and preparation method thereof

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Embodiment 1

[0046] Weigh 0.80g NiCl with electronic balance 2 ·6H 2 O(3.35×10 -3 mol) and 1.36g FeCl 2 4H 2 O(6.75×10 -3 mol), dissolved in 30 mL of deionized water, stirred evenly and then ultrasonicated for 30 minutes. Weigh 0.01 g of melamine foam, soak it in the above metal salt solution, and perform ultrasonic adsorption for 20 minutes. After letting the melamine foam dry naturally, see figure 1 , placed in a tube furnace, and calcined at 850°C for 2 hours in a mixed atmosphere of 99.5% nitrogen + 0.5% oxygen to obtain NiFe 2 o 4 - Nitrogen-doped carbon microtube composites. NiFe 2 o 4 The content in the composite material is 90%. figure 2 For the scanning electron micrograph of composite material synthesized in this embodiment, it can be seen that NiFe 2 o 4 Nanoparticles are uniformly supported on nitrogen-doped carbon microtubes. Adopt X-ray diffractometer to characterize the NiFe that the present invention prepares 2 o 4 -Crystal structure of nitrogen-doped carbo...

Embodiment 2

[0048] Weigh 0.67g Co(NO 3 ) 2 ·6H 2 O(2.3×10- 3 mol) and 1.87g Fe(NO 3 ) 2 9H 2 O(4.6×10- 3 mol), dissolved in 30 mL of deionized water, stirred evenly and then ultrasonicated for 30 minutes. Weigh 0.05 g of melamine foam, soak it in the above metal salt solution, and perform ultrasonic adsorption for 20 minutes. After the melamine foam is naturally dried, it is placed in a tube furnace and calcined at 850°C for 2 hours in a mixed atmosphere of 99.5vol% nitrogen + 0.5vol% oxygen to obtain CoFe 2 o 4 - Nitrogen-doped carbon microtube composites. The content of iron oxide in the composite material is 75%. CoFe 2 o 4 -The nitrogen-doped carbon microtube composite absorbing material has good absorbing performance. At 5.6GHz, the reflection loss peak of the 4mm composite material sample is -30.5dB, and the effective bandwidth of RL<-10dB is 3.9GHz, which can effectively absorb electromagnetic waves in this frequency band.

Embodiment 3

[0050] Weigh 0.33g CuSO with an electronic balance 4 (1.3×10- 3 mol) and 1.05g Fe 2 (SO 4 ) 3 (2.6×10- 3 mol), dissolved in 30 mL of deionized water, stirred evenly and then ultrasonicated for 30 minutes. Weigh 0.05 g of melamine foam, soak it in the above metal salt solution, and perform ultrasonic adsorption for 20 minutes. After the melamine foam is naturally dried, it is placed in a tube furnace and calcined at 750°C for 3 hours in a mixed atmosphere of 99.5vol% nitrogen + 0.5vol% oxygen to obtain CuFe 2 o 4 - Nitrogen-doped carbon microtube composites. The content of iron oxide in the composite material is 80%. The iron oxide-nitrogen-doped carbon microtube composite absorbing material has good absorbing properties. At 4.4GHz, the reflection loss peak of the 4mm composite material sample is -29.5dB, and the effective bandwidth of RL<-10dB is 2.9GHz, which can effectively absorb electromagnetic waves in this frequency band.

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Abstract

The invention discloses an iron oxide-nitrogen doped carbon micro-tube composite wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps that S1)metal salt containing M ions and iron ions is dissolved in deionized water, and ultrasonic treatment is conducted after uniform stirring, with the M ions being one or more of Cu<2+>, Ni<2+>, Co<2+>,Mn<2+>, Zn<2+> and Fe<2+>; S2) melamine foam is placed in the metal salt solution in the step S1, and the melamine foam ultrasonically adsorbs the metal salt solution; and S3) the melamine foam adsorbing the metal salt is naturally dried, then put into a tubular furnace, and calcined in a mixed atmosphere containing inert gas and oxygen. The iron oxide-nitrogen doped carbon micro-tube composite wave-absorbing material prepared has excellent wave-absorbing performance, and has a good application prospect in the field of electromagnetic wave absorbing materials.

Description

technical field [0001] The invention relates to an iron oxide-nitrogen-doped carbon microtube composite wave-absorbing material and a preparation method thereof, belonging to the field of wave-absorbing materials. Background technique [0002] The application of electromagnetic technology in human's daily life is increasing day by day, and the resulting electromagnetic radiation pollution cannot be ignored, and it has already been included in the ranks of five major pollutions - water pollution, air pollution, solid waste pollution, noise pollution, and electromagnetic radiation pollution. Electromagnetic radiation can induce gene mutations in the human body, leading to the occurrence of various diseases including cancer. In addition, it will seriously affect human's daily communication and some sophisticated electronic systems, which will greatly threaten national information security. Therefore, both military and civilian aspects, electromagnetic radiation pollution must ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C01G53/00C01B32/168C01B32/158C09K3/00
CPCC01G49/0081C01G53/00C01B32/168C01B32/158C09K3/00C01P2002/72C01P2004/03C01P2006/40C01P2006/42
Inventor 付民陈伟
Owner SHANDONG UNIV OF SCI & TECH
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