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: 2013-04-03
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

[0018] (1) Add 6.0g of multi-walled carbon nanotubes with a diameter of 30-50nm into 400mL of concentrated sulfuric acid, let it stand for 24 hours, then add 10.0g of potassium permanganate, stir at room temperature for 1 hour, ultrasonicate at 55°C for 30 minutes, then 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 , let stand for 24 hours, remove the supernatant, centrifuge the precipitate, and dry it under vacuum at 50°C to obtain graphene oxide. Add graphene oxide into a small amount of deionized water, sonicate for 30 minutes, add 300mL of ammonia water and 300mL of hydrazine hydrate, under the condition of condensation and reflux, heat the water bath to 95°C for 1 hour, change the distillation device, distill most of the ammonia water, and centrifuge the residue for 50 ℃ vacuum drying, grinding to obtain the product graphene.

[0019] (2) Weigh 4.0g Co(NO 3 ) 2 ·6H 2 O, 11.30g ...

Embodiment 2

[0022] Graphene, CoFe2 o 4 The preparation method is the same as the step (1) and step (2) of Example 1 respectively, and 0.20g graphene, 0.30g CoFe 2 o 4 , measure 0.50mL aniline monomer, the preparation method is the same as step (3) of Example 1, to obtain 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 in which the reflectivity loss value is lower than -10dB in 2~18GHz, and the minimum reflectivity loss value can reach -41dB.

Embodiment 3

[0024] Graphene, CoFe 2 o 4 The preparation method is the same as the step (1) and step (2) of Example 1 respectively, and 0.30g graphene, 0.20g CoFe 2 o 4 , measure 0.50mL aniline monomer, the preparation method is the same as step (3) of Example 1, to obtain graphene / CoFe 2 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 in which the reflectivity loss value is 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 / The preparation method of polyaniline composite wave-absorbing material. 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 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, so it has become 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 the movement speed of electrons reaches 15000cm / V s, which is equivalent to 1 / 300 of the speed of lig...

Claims

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Application Information

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Patent Type & Authority Applications(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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