FeCo@MXene core-shell structure composite wave-absorbing material and preparation method thereof

A composite wave-absorbing material, core-shell structure technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of limited absorbing performance of MXene, magnetic loss mechanism introduced by MXene, etc., and achieve broadband strong electromagnetic wave absorption characteristics , Significant dielectric polarization loss characteristics, the effect of low production cost

Active Publication Date: 2019-09-27
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, composite polyaniline, molybdenum disulfide, and onion carbon are still dielectric absorbing materials, which cannot introduce a magnetic loss mechanism into MXene. Therefore, the degree of improving the absorbing performance of MXene is limited.

Method used

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  • FeCo@MXene core-shell structure composite wave-absorbing material and preparation method thereof
  • FeCo@MXene core-shell structure composite wave-absorbing material and preparation method thereof
  • FeCo@MXene core-shell structure composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] (1) Weigh 5gTi 3 SiC 2 The MAX phase powder was poured into a 500 mL polytetrafluoroethylene beaker filled with a 40% hydrofluoric acid solution, and stirred magnetically at a speed of 300 r / min for 24 h under the assistance of an ultrasonic power of 40 W; After the reaction was completed, the above mixed solution was left to stand for 2 hours and then the supernatant was removed, then the black precipitate was washed with deionized water for 3 times, then filtered and dried at 80°C for 2 hours to obtain MXene powder. The microscopic appearance of the tested powder was as follows: figure 1 As shown, it can be seen that the MXene prepared in the present invention presents a lamellar microstructure with uniform morphology.

[0030] (2) Weigh 2.3g CoCl respectively 2 •6H 2 O and 2.8 g FeSO 4 ·7H 2 O, and dissolved in a glass flask equipped with 150 mL of ethylene glycol solvent; add the lamellar MXene powder obt...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] (1) Weigh 6gTi 3 AlC 2 The MAX phase powder was poured into a 500 mL polytetrafluoroethylene beaker filled with a 40% hydrofluoric acid solution, and stirred magnetically at a speed of 300 r / min for 12 h under the assisted action of ultrasound with a power of 60 W; After the reaction, the above mixture was left to stand for 2 hours and the supernatant was removed, then the black precipitate was washed 4 times with deionized water, then filtered and dried at 60°C for 2 hours to obtain a lamellar MXene powder;

[0036] (2) Weigh 4.5g CoSO 4 •6H 2 O and 5.5 g FeSO 4 ·7H 2O, and be dissolved in the glass flask that 150 mL ethanol solvent is housed, add the lamellar MXene powder that step (1) obtains, and with 250 r / min rotating speed magnetic stirring is uniformly dispersed 3h to form mixed solution; Add 20mL of 80% hydrazine hydrate solution and NaOH compound, adjust its pH to 13, and continue to disperse with m...

Embodiment 3

[0038] This embodiment includes the following steps:

[0039] (1) Weigh 8gTi 3 SiC 2 The MAX phase powder was poured into a 500 mL polytetrafluoroethylene beaker filled with a 40% hydrofluoric acid solution, and stirred magnetically at a speed of 400 r / min for 18 h under the assistance of an ultrasonic power of 80 W; After the reaction was completed, the above mixture was left to stand for 3 h and then the supernatant was removed, then the black precipitate was washed 5 times with deionized water, filtered and dried at 60 °C for 3 h to obtain MXene powder.

[0040] (2) Weigh 11.2g Co(NO 3 ) 2 •6H 2 O and 10.8 g FeSO 4 ·7H 2 O, and be dissolved in the glass flask that 150 mL ethylene glycol solvent is housed, add the lamellar MXene powder that step (1) obtains, and with 400 r / min rotating speed magnetic stirring the mixed solution that disperses 2h evenly; Add mixed solution Slowly add 25mL of 80% hydrazine hydrate solution and NaOH compound to adjust the pH to 12, cont...

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Abstract

The invention discloses an FeCo@MXene core-shell structure composite wave-absorbing material and a preparation method thereof. The material is a core-shell structure formed by coating flake-like MXene with a magnetic FeCo nano-particle, and the mass ratio of the FeCo nano-particle to the MXene is 1 to (2-4); wherein the MXene has a flake-like microstructure, the surface is rich in functional groups, and is capable of enabling the FeCo to be coated on the surface of the MXene to form a microcosmic core-shell structure of a dielectric-magnetic two-phase heterojunction which has remarkable dielectric polarization loss characteristics; meanwhile, the FeCo coated on the surface of the MXene not only has high frequency natural resonance effect and strong magnetic loss mechanism, but also balances a difference between a complex dielectric frequency spectrum and a complex permeability frequency spectrum of the composite material, which is beneficial to the matching with space impedance; therefore, the material exhibits wideband and strong electromagnetic wave absorption characteristics, and a reflectivity result indicates that the material is superior to the bandwidth -10dB by 8.8 GHz.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a FeCo@MXene core-shell structure composite wave-absorbing material and a preparation method thereof. Background technique [0002] In the military field, with the rapid development of radar detection technology, radar stealth technology is increasingly concerned, and the use of wave-absorbing materials is an effective way to achieve radar stealth; in the civilian field, the development of wireless communication technology and the popularization of corresponding products have given people While daily life brings convenience, it also produces serious electromagnetic pollution and electromagnetic interference problems. The use of wave-absorbing materials is an effective means to solve electromagnetic interference and electromagnetic pollution. A large number of studies have shown that high-performance absorbing materials should have multiple electromagnetic wave atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 贺君颜铄清邓永和陈桥
Owner HUNAN INSTITUTE OF ENGINEERING
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