Metal organic frameworks-derived(MOFs) square crystals dotted Fe/C composite nanofibers for enhanced electromagnetic wave absorption performance data

In this study, the data focuses on the preparation, characterization, and electromagnetic wave absorption (EWA) properties of square crystals dotted Fe/C composite nanofibers derived from metal - organic frameworks (MOFs). Morphology data: SEM and TEM images show the morphology of samples. Before calcination, iron metal nanoparticles with cubic structures are dispersed on carbon nanofibers. After calcination, the average diameter of carbon nanofibers decreases with increasing temperature. For example, at 600 °C, 650 °C, and 700 °C, the average diameters change. FC650 has the largest number of interfaces and a homogeneous morphology. Different mass ratios of carbon nanofibers also affect the morphology, with the conductive network becoming denser as the carbon nanofiber mass increases. Structure and composition data: XRD patterns indicate the phase compositions of samples. After calcination, peaks of α - Fe and graphitic carbon are present. Raman spectra show the graphitization degree of carbon nanofibers, with the ID/IG ratio changing with temperature and carbon nanofiber content. TGA curves reveal the thermal loss process of samples, and FT - IR spectra confirm the presence of certain functional groups in the composites. Electromagnetic parameters and EWA performance data: Complex permittivity (ε′ and ε″), complex permeability (μ′ and μ″), dielectric loss tangents (tanδε), and magnetic loss tangents (tanδμ) are measured. The EWA capacity is assessed by reflection loss (RL). FC1 shows better EWA performance than FC0.5 and FC0.25. For instance, FC1 has a RLmin of - 28.09 dB at 5.5 mm thickness, and its widest EAB is 1.1 GHz at 2.5 mm. Reducing the filler loading ratio to 10% in FC1 - 10 leads to a RLmin of - 20.82 dB at 3.0 mm and a wide EAB of 3.8 GHz at 1.5 mm. Impedance matching is studied, and it is found that FC1 has a better impedance matching, which is related to its EWA performance. Cole - Cole semicircles are analyzed to explore the relaxation process, and the quarter - wavelength matching model is used to explain the shift of RLmin with thickness.