Designed synthesis of low-dimensional nickel-iron@carbon nanocomposites and electromagnetic wave absorption properties
The booming development of 5G communication has brought great convenience to people's lives,but it also brings huge problems of electromagnetic pollution.It is usually difficult for single-component absorbing materials to achieve excellent impedance matching characteristics and excellent electromagnetic wave absorption ability at the same time,so developing materials that can combine the advantages of both has become a challenge.In this paper,the authors used solvothermal synthesis to prepare rod-shaped nickel-iron metal-organic frameworks,and then func-tionalized the surfaces with polyvinylpyrrolidone to grow zeolitic imidazolate framework-8 to form a bimetallic organ-ic framework heterostructure.After high-temperature thermal decomposition,nickel-iron@carbon materials were obtained.The constructed heterostructure has a large heterojunction interface,enhances interfacial polarization,and nickel-iron alloy nanoparticles catalyze organic ligands to form carbon nanotubes,thereby increasing dielectric loss.The minimum reflection loss of nickel-iron@carbon materials is-71.08 dB,the matching thickness is 2.06 mm,and the maximum effective absorption bandwidth is 5.72 GHz at 1.97 mm,achieving efficient electromagnetic wave ab-sorption.This provides a certain reference for future research on multi-component absorbing materials.
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