Abstract
The widespread applications of electromagnetic (EM) waves in wireless communication and detection may lead to severe EM wave pollution, which drives the urgent need for EM wave absorbents. However, satisfactory impedance matching remains a challenge for the wide bandwidth absorption of one-dimensional core-shell absorbers. To cope with this challenge, in this study, a novel core-shell LaOCl/LaFeO3 nanofiber (NF) is designed and successfully synthesized via electrospinning followed by proper thermal treatment. This unique structure first assembles conductive magnetic LaFeO3 shells and ionic compound LaOCl cores. Benefiting from the synergistic contributions of the dielectric and magnetic loss coupling and impedance matching, the LaOCl/LaFeO3 NFs exhibit a dramatically optimized performance with a minimum reflection loss (RL) of −40.1 dB (at 2.0 mm) and an effective absorption bandwidth (EAB) of 6.4 GHz (at 2.4 mm) under an ultra-low filler loading of 4 wt%. This work provides a promising LaOCl/LaFeO3 NF EM wave absorber and opens up a new avenue to tune the impedance match by the composition and microstructure design.
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