Core-shell structured wave absorbing material as well as preparation method and application thereof

Abstract

The invention discloses a core-shell structured wave absorbing material as well as a preparation method and application thereof. The wave absorbing material is of a core-shell structure with two-dimensional transition metal-sulfur group element nanosheets as a core and hollow carbon spheres as a shell. The preparation method comprises the following steps: dissolving the hollow carbon spheres in asolvent, sequentially adding a transition metal source and a sulfur group element source in sequence, performing stirring and dissolving, performing a solvent thermal reaction, and perfomring aftertreatment, so as to obtain the wave absorbing material. The invention further discloses application of the wave absorbing material in fields such as military and civil high-frequency electromagnetic compatibility and protection. The core-shell structured wave absorbing material disclosed by the invention has a density of 0.3-1.5kg / cm<3>, is capable of effectively improving the maximum reflection lossvalue and an effective bandwidth of the material within a frequency range of 2-40GHz, and is an electromagnetic compatibility and protection material that can meet requirements of civil high-frequency electronic devices and weapons such as military airships and shells.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a core-shell structure type wave-absorbing material and its preparation method and application. Background technique [0002] With the rapid development of information technology, absorbing materials closely related to environmental security, information security and national defense construction are gradually becoming a research hotspot, covering various new electromagnetic absorbing materials such as metal materials, inorganic non-metal materials, polymer materials and composite materials. Wave material keeps coming. [0003] Among them, due to their excellent light weight and good mechanical properties, carbon materials have been greatly researched and applied in the field of microwave absorption since the 1940s. However, the impedance mismatch problem caused by its own high conductance has been puzzling the majority of scientific researchers, and has not been well res...

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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 2-18 GHz 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.

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