Electromagnetism Characteristics And Microwave Loss Mechanism Of The Multi-component Composite Ti₃C₂T_x Absorbers

High performance absorbing materials have a wide application prospect in civil anti-electromagnetic radiation interference and military radar stealth technology.The design and development of novel absorbing materials with excellent comprehensive performance has become a current research hotspot.Ti₃C₂T_x,as a new type of two-dimensional material,has attracted extensive attention in the field of microwave absorption due to its special layered structure and abundant surface functional groups.In this paper,Ti₃C₂T_x is used as the basic functional material unit,and it is compounded with various types of electromagnetic materials by various methods to achieve the regulation of microwave electromagnetic characteristics and the synergistic effect of microwave electromagnetic loss mechanism.The main research contents are as follows:Firstly,the composite modification of multilayer Ti₃C₂T_xcompounded with magnetic nanoparticles was discussed.The Co Ni/Ti₃C₂T_x composite absorbent was synthesized by in-situ hydrothermal method.The Co Ni/Ti₃C₂T_x composite absorbent material exhibited superior absorbing properties through the optimization of magnetic phase content,confirming the feasibility of composite modification of magnetic alloy absorber and high-dielectric multilayer Ti₃C₂T_x absorber to realize the synergistic effect of electromagnetic loss.Furthermore,the composite modification of magnetic Zn Fe₂O₄nanoparticles and multilayer Ti₃C₂T_x absorbents was explored.Core-shell Zn Fe₂O₄/Ti₃C₂T_x composite absorbent was prepared by in-situ solvothermal method.By controlling the content of Zn Fe₂O₄ loaded on the surface of Ti₃C₂T_x,the dielectric constant is effectively reduced,the magnetic loss is improved,the impedance matching is optimized,and the effective absorption bandwidth reaches 6.08 GHz.In order to solve the problem of high filling density of multilayer Ti₃C₂T_x composite absorbents.The few-layer Ti₃C₂T_x nanosheets with low density were prepared by ultrasonic exfoliation of multilayer Ti₃C₂T_x.The composite absorbent of Fe nanochains decorated few-layer Ti₃C₂T_xnanosheets was prepared by electrostatic self-assembly method.When the filler loading of composite absorbent is 15 wt%,the effective absorption bandwidth of 6.72 GHz can be achieved.To further improve the impedance matching of few-layer Ti₃C₂T_x nanosheets,a multi-component layered Ti₃C₂T_x/Co@NC composite absorbent was prepared by electrostatic self-assembly method.The Ti₃C₂T_x/Co@NC composites can effectively integrate the conductivity of few-layer Ti₃C₂T_x material,and the magnetism and three-dimensional layered structure of Co@NC material to enhance microwave absorption performance.When the filler loading is 10wt%,the effective absorption bandwidth reaches 6.80 GHz.Finally,the lightweight and flexible Ti₃C₂T_x/Co-NC/C composite nanofiber film with porous structure was synthesized by electrospinning combined with high-temperature carbonization method.The experimental results and electromagnetic simulation analysis show that the composite fiber film realizes the synergistic effect of multiple components and multiple electromagnetic loss mechanisms,and improves the impedance matching characteristics and absorbing performance.When the filler loading is 10 wt%,the effective absorption bandwidth reaches 7.04 GHz and the absorption peak at 10.24 GHz reaches-46.92 d B.The relevant research results provide new ideas for the design and development of high-performance microwave absorbing materials.