A core-shell structure type wave-absorbing material and its preparation method and application

Abstract

The invention discloses a core-shell structure type wave-absorbing material and a preparation method thereof. The wave-absorbing material has a core-shell structure with two-dimensional transition metal-chalcogen compound nanosheets as the core and hollow carbon spheres as the shell. The preparation method comprises: dissolving hollow carbon spheres in a solvent, sequentially adding a transition metal source and a chalcogen source, stirring and dissolving, performing solvothermal reaction, and then obtaining the wave-absorbing material through post-treatment. The invention also discloses the application of the wave-absorbing material in military and civil high-frequency electromagnetic compatibility and protection fields. The density of the core-shell structure wave-absorbing material of the present invention is 0.3~1.5kg / cm 3 It can effectively improve the maximum reflection loss value and effective bandwidth of the material in the frequency range of 2-40GHz. It is an electromagnetic compatibility and protective material that can meet the needs of civilian high-frequency electronic devices and military airships, artillery shells and other weapons and equipment.

Description

Technical field [0001] The present invention relates to the field of absorbing materials, and more particularly to a nuclear shell structure type absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of information technology, absorbing materials related to environmental safety, information security, and defense construction are gradually become scientific research hotspots, covering metal materials, inorganic non-metallic materials, polymer materials and composites. Electromagnetic suction Wave materials are constantly emerging. [0003] Among them, due to excellent lightweight and good mechanical properties, carbon materials have been greatly studied and applied in the field of microwave absorption since the 1940s. However, due to its own high conductance, the problem of impedance mismatch has been plaguing the majority of researchers, and I have never got a good solution. Molybdenum disulfide (MOS) 2 ) And diultine (WS) 2...

AI Technical Summary

Problems solved by technology

However, the impedance mismatch problem caused by its own high conductance has been puzzling the majority of scientific researchers, and has not been well solved for a long time

[0005] For example, the patent application with the publication number CN107286907A discloses a core-shell structure molybdenum disulfide / carbonyl iron composite microwave absorber. It forms a core-shell structure. When the matching thickness is 1.9-3.3mm, the maximum reflectance in the frequency range of 2-18GHz is -46dB--59dB, and the effective absorption bandwidth is 1.71GHz. However, due to the high density of carbonyl iron itself (7.8g / cm 3 ), resulting in a higher density of the absorbing material made from it

In addition, the patent application with the publication number CN105883921A discloses a 3D molybdenum disulfide nano-microsphere absorbing material with broadband and strong absorbing ability. Rates of -46.8dB and -33.2dB, but the matching thickness is as high as 7.5mm and 8mm

[0006] It can be seen that the current composite absorbing material system still has problems such as uneven distribution of absorbing agents, poor impedance matching, and large coating thickness, and has not truly realized the requirements of "thin, light, wide, and strong" absorbing materials.

Images