A new preparation method of electromagnetic wave absorbing material

A technology for absorbing materials and electromagnetic waves, applied in electrical components, magnetic field/electric field shielding, etc., can solve problems such as carcinogenicity, and achieve the effects of low preparation cost, broad market prospects and good product quality

Active Publication Date: 2019-01-04
QINGDAO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Previous studies have shown that pure Ti after N,N-dimethylformamide solvothermal treatment 3 C 2 T x MXene can be used as an electromagnetic wave absorbing material based on dielectric loss due to increased layer spacing, but there are still environmental concerns (N,N-dimethylformamide is carcinogenic)

Method used

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  • A new preparation method of electromagnetic wave absorbing material
  • A new preparation method of electromagnetic wave absorbing material
  • A new preparation method of electromagnetic wave absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The preparation method of a novel electromagnetic wave absorbing material involved in this embodiment, the specific process steps of the method are carried out as follows:

[0026] S1, use Nb 2 Preparation of pure Nb from AlC precursor 2 C MXene;

[0027] (1), weigh 4g Nb 2 AlC powder is put into the 250mL polypropylene bottle, and put on the magnetic stirrer, set the rotating speed 300 rpm;

[0028] (2), press 1g Nb in the polypropylene bottle of step (1) 2 AlC: 20mL hydrofluoric acid solution, slowly drop 80mL hydrofluoric acid solution with a mass fraction of 49%, react at room temperature for 180h under stirring at 300 rpm, and prepare a hydrothermal suspension for use;

[0029](3) After the reaction, take out the suspension in the polypropylene bottle and put it into a centrifuge tube, place the centrifuge tube symmetrically in the centrifuge, and centrifuge at a speed of 9000 rpm for more than 15 minutes to obtain the centrifuged solution, the lower layer pre...

Embodiment 2

[0038] The present embodiment 2 is to the Nb prepared in embodiment 1 2 The electromagnetic wave absorption performance of C MXene nanosheets is tested, and the test results are as follows Figure 4 As shown, we found that the improved layered Nb 2 The electromagnetic wave absorption performance of C MXene nanosheets has been greatly improved, especially when the thickness of the absorption layer of the nanosheets is 2.9mm when ethanol is used as a solvent, the optimal absorption performance is obtained at 3.93GHz, and the highest reflection loss reaches -52.2dB , the absorption efficiency can reach 99.999%, and the absorption frequency band is wide, and there is high electromagnetic wave absorption in 2.0-4.0GHz; the electromagnetic wave absorption intensity of the nanosheets obtained by using water as a solvent is slightly smaller than that obtained by using ethanol as a solvent, but The absorption band is wider; indicating that the layered Nb prepared in Example 1 2 C MXe...

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Abstract

The invention belongs to the field of preparation of nanometer materials and electromagnetic wave absorbing materials, the invention relates to a preparation method of a novel electromagnetic wave absorbing material, Ethanol or deionize water and Nb2AlC MAX are use as raw materials, Nb2C MXene nanosheets were synthesized by HF (hafnium) etching and hydrothermal method and their interlayer spacingand surface clusters were adjusted. At the same time, However, without adding any surfactant or template, pure Nb2C MXene was prepared by using Nb2AlC precursor, and then Nb2C MXene was modified by hydrothermal method to obtain improved Nb2C MXene nanosheets. The modified Nb2C MXene nanosheets were prepared by hydrothermal method. Nb2C MXene nanosheets have good electromagnetic wave absorption performance and wide absorption band, which can be used as microwave absorbing materials, and can be used in electromagnetic shielding technology and combat stealth technology. The process is green and environmentally friendly. The method is simple and easy to operate, easy to obtain raw materials, low production cost; The preparation efficiency is high, the quality of the prepared product is good, the stability is strong, the large-scale production can be realized, the application environment is good, and the market prospect is broad.

Description

Technical field: [0001] The invention belongs to the field of preparation of nanomaterials and electromagnetic wave absorbing materials, and relates to a preparation method of a novel electromagnetic wave absorbing material, which uses ethanol or deionized water and Nb 2 AlC MAX is used as raw material, and Nb is synthesized by HF (hafnium) etching and hydrothermal method 2 C MXene nanosheets can adjust their interlayer spacing and surface groups without adding any surfactants or templates. Background technique: [0002] Efficient and lightweight electromagnetic wave absorbing materials play a vital role in overcoming electromagnetic wave pollution, which seriously affects human health and degrades the performance of electronic devices. In recent years, various new EMW absorbers have been developed to combat electromagnetic wave radiation and interference. Among them, two-dimensional structure materials such as graphene and transition metal oxides (or sulfides) are due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 许元红靳兆勇牛玉生
Owner QINGDAO UNIV
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