Study On Design,Preparation And Performance Modulation Of Low-Dimensional Metal Sulfides Microwave Absorption Materials

The rapid development of information technologies and electronics has increased the demand for microwave absorption materials in various applications,including military equipment,electronic devices,and IoT systems.To address this challenge,this paper designs and develops enhanced microwave absorption materials.The focus is on the preparation and application research of highperformance low-dimensional metal sulfides(MSs)microwave absorption materials.The study involves synthesizing unique heterostructures of lowdimensional MSs and optimizing their electromagnetic parameters,impedance matching,and attenuation constant to improve reflection loss(RL)intensity and effective absorption bandwidth(EAB).Experiments and theoretical calculations reveal the microelectromagnetic response and attenuation mechanism of lowdimensional MSs heterostructures.The study also uses CST Studio simulation to provide a theoretical basis and data support for designing high-performance microwave absorption materials.In summary,this study meets the requirement for efficient and versatile microwave absorption materials and provides valuable insights into their design and exploitation.A structural design and interface engineering strategy was proposed for the VS4 nanorod/rGO heterostructure,revaling its electromagnetic response characteristics and attenaution performance.By controlling the VS4 nanorod anchoring amount on rGO,the microstructure and heterointerface of VS4/rGO heterostructure were regulated to optimize impedance matching and attenuation constant,achieving 0.98 and 187,respectively.At an ultrathin thickness of 1.5 mm,the RL was-43.5 dB.The EAB of 4.8 GHz was achieved at 1.4 mm.The role of heterointerface in electromagnetic response and polarization loss was decrypted,revealing the microwave loss mechanism.The 2VS4/rGO40-30%coating with a thickness of 1.5 mm had a radar cross section(RCS)reduction value of 38.4 dB·m2 when the microwave was incident at 0° and 14 GHz,according to CST electromagnetic simulation.Inter-dimensional heterostructure design strategy was proposed,and a MoS2 nanosheet@polypyrrole(PPy)/NG heterostructure was constructed by selectively synthesizing MoS2 nanosheets,polypyrrole(PPy)nanotubes,and nitrogen-doped graphene(NG).By integrating the unique advantages of multidimensional materials,including the anisotropy and tubular structure of PPy nanotubes,the flat reflection and in-plane electron transfer of 2D MoS2 nanosheets,the characteristics of 1T/2H hetero-phase interfaces,and the micro-wrinkles and large specific surface area of 3D NG,the electromagnetic parameters,impedance matching,and RL of MoS2 nanosheet@PPy/NG heterostructures were regulated to achieve a RL of-35.6 dB at a thickness of 1.5 mm and a frequency of 9.9 GHz.The electromagnetic response mechanism and loss mechanism of MoS2 nanosheet@PPy/NG heterostructures were analyzed by experiments and theoretical calculations.High-quality Bi2S3 nanorod/rGO heterostructure was successfully prepared via a solvothermal method.The influence of the interface and the ratio of Bi2S3 nanorods to rGO on electromagnetic response and parameters were studied.The impedance matching and RL were regulated,optimizing the strong electromagnetic response.With the 8.35 GHz and 3.0 mm thickness,the RL peak reached-76.25 dB,achieving 99.99%absorption for incident microwaves.The EAB covered 11.4-18.0 GHz at 2.0 mm thickness.The RCS value was less than-10 dB·m2 for90°<theta<90° at 11 GHz and 1.5 mm,and RCS reduction value was 30.79 dB·m2 when the microwave was incident at 0°.High-entropy low-dimensional MSs were employed for the first time in the design of microwave absorption materials.(FeNiCoCuMn)S2 nanocrystalline eggshell microsphere MSs were prepared through a glycerol precursor thermal sulfidation method.To improve their electromagnetic response and attenuation characteristics,rGO-coated heterostructure of high-entropy MSs microspheres was constructed.This design strategies achieved efficient microwave absorption performance through entropy regulation and microspace structure design.The RL peak of the heterostructure reached-22 dB at 1.4 mm,and the EAB reached 5.6 GHz at 1.6 mm.At a thickness of 2.2 mm,the EAB covered 8.7～12.1 GHz,achieving effective absorption in the X-band.The RCS value was-9.58 dB·m2 at 13 GHz and a thickness of 1.7 mm,and the RCS reduction value reached 24.6 dB·m2 when the microwave was incident at 0°,according to CST electromagnetic simulation.