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Preparation method of graphene/CoFe2O4/polyaniline composite absorbing material

A composite wave absorbing material, cofe2o4 technology, applied in the direction of graphene, nano carbon, etc., can solve the problem of difficult to achieve satisfactory results, and achieve the effect of wide absorption frequency band

Active Publication Date: 2015-01-07
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The absorption of electromagnetic waves by polyaniline is mainly achieved through electrical loss, and it is difficult to achieve satisfactory results. Effective ways to achieve high conductivity or electromagnetic functions of polyaniline should be sought

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Add 6.0 g of multi-walled carbon nanotubes with a diameter of 30 to 50 nm into 400 mL of concentrated sulfuric acid, let stand for 24 hours, then add 10.0 g of potassium permanganate, stir at room temperature for 1 hour, and after ultrasonicating at 55 °C for 30 minutes, adjust the temperature to 70 °C Continue to sonicate for 30min, cool to room temperature, pour into 1.5L ice water, add 200mL H 2 O 2 , stand for 24h, remove the supernatant, centrifuge the precipitate, and dry it in a vacuum at 50°C to obtain graphene oxide. Graphene oxide was added to a small amount of deionized water, sonicated for 30 minutes, 300 mL of ammonia water and 300 mL of hydrazine hydrate were added, and under the condition of condensation and reflux, the water bath was heated to 95 ° C and reacted for 1 h. ℃ vacuum drying, grinding to obtain the product graphene.

[0017] (2) Weigh 4.0g Co(NO 3 ) 2 ·6H 2 O, 11.30g Fe(NO 3 ) 3 ·9H 2 O was dissolved in deionized water, slowly pou...

Embodiment 2

[0020] Graphene, CoFe 2 O 4 The preparation method is respectively the same as step (1) and step (2) in Example 1, and 0.20g graphene, 0.30gCoFe are weighed 2 O 4 , measure 0.50mL aniline monomer, the preparation method is the same as the step (3) of embodiment 1, obtains Graphene / CoFe 2 O 4 / polyaniline composite absorbing material (X=0.20, Y=0.30, Z=0.50). The prepared composite material has a frequency bandwidth of 14.5GHz with a reflectivity loss value of less than -10dB within 2-18GHz, and the minimum reflectivity loss value can reach -41dB.

Embodiment 3

[0022] Graphene, CoFe 2 O 4 The preparation method of 0.30g Graphene, 0.20gCoFe and 2 O 4 , measure 0.50mL aniline monomer, the preparation method is the same as the step (3) of embodiment 1, obtains Graphene / CoFe2 O 4 / polyaniline composite absorbing material (X=0.30, Y=0.20, Z=0.50). The prepared composite material has a frequency bandwidth of 12.4GHz with reflectivity loss value lower than -10dB in 2-18GHz, and the minimum reflectivity loss value can reach -43dB.

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Abstract

The invention provides a preparation method of a graphene / CoFe2O4 / polyaniline composite absorbing material. The preparation method comprises the following steps in sequence: preparing the graphene by adopting multi-walled carbon nanotubes with diameter of 30 to 50 nanometers as the raw materials; preparing the CoFe2O4 through a sol-gel auto-combustion method by adopting the Co(NO3)2.6H2O and Fe(NO3)3.9H2O as the raw materials; and then preparing the graphene / CoFe2O4 / polyaniline composite absorbing material through an in-situ polymerization method by adopting the prepared graphene, CoFe2O4 and aniline monomer as the raw materials. The composite material is higher in conductivity, magnetic performance and stability, and brings important applications in the microwave absorbing field and the electromagnetic shielding field.

Description

technical background [0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, in particular to a graphene / CoFe 2 O 4 / Polyaniline composite wave absorbing material preparation method. Background technique [0002] Ferrite nanopowders have excellent magnetic and electrical properties, and their synthesis and properties have been extensively studied in recent years. CoFe with spinel-type crystal structure 2 O 4 It is a magnetic material with excellent performance. It has a mild saturation magnetization field and a large coercive force, making it a very competitive new generation of magneto-optical recording materials. [0003] The lattice structure of graphene is very stable, and the stability of this lattice structure is an important reason for many excellent properties of graphene. The most prominent property is that its electrons move at a speed of 15,000 cm / V s, which is equivalent to 1 / 300 of the speed of light, far exceed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02C08K3/04C08K3/22C01B31/04C01B32/184
Inventor 谢宇赵杰凌云闫思凤石磊朱卫多余远福刘锦梅张凯赖强
Owner NANCHANG HANGKONG UNIVERSITY
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