The development of Fe_(3)O_(4) in the fields of electromagnetic wave absorption(EMA)is severely hindered by its narrow bandwidth and environmental tolerance.Herein,we introduce dielectric components and favorable hete...The development of Fe_(3)O_(4) in the fields of electromagnetic wave absorption(EMA)is severely hindered by its narrow bandwidth and environmental tolerance.Herein,we introduce dielectric components and favorable hetero-interface engineering on Fe_(3)O_(4) to promote the EMA and broaden the effective absorption bandwidth(EAB).Before incorporation of dielectric components,Fe_(3)O_(4) microspheres show a high-effective EMA in C and X bands with the strongest reflection loss(RL)of 70.40 dB at 8.86 GHz and a corresponding EAB of 5.3 GHz(5.3−10.6 GHz).Upon the introduction of dielectric SiO2 or TiO2 coating,the tailored permittivity and the enhanced dielectric loss are obtained by reinforcing the interface polarization.Meanwhile,the structural feature imparts desirable impedance matching and multiple reflection and scattering absorption.As a result,Fe_(3)O_(4)@SiO2 exhibits outstanding EMA performances in C,X,and Ku bands,including an impressive EAB of 6.5 GHz(11.5-18.0 GHz)covering the whole Ku band with only 2.5 mm.Fe_(3)O_(4)@TiO2 achieves a broaden EAB of 8.4 GHz with 3.0 mm,which is better than those of many Fe_(3)O_(4)-based absorbers previously reported.More importantly,both SiO2 and TiO2 coating efficiently enhance the marine anticorrosion properties of Fe_(3)O_(4),making it a superior EMA material with strong and wide absorbing features for EMA application.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52403356)the Natural Science Foundation of Liaoning Province(No.2024-MS-128)+1 种基金the Basic Research Project Educational Department of Liaoning Province(No.JYTQN2023367)Shenyang University of Chemical and Technology of"Outstanding youth"plan Funds(No.2022YQ002).
文摘The development of Fe_(3)O_(4) in the fields of electromagnetic wave absorption(EMA)is severely hindered by its narrow bandwidth and environmental tolerance.Herein,we introduce dielectric components and favorable hetero-interface engineering on Fe_(3)O_(4) to promote the EMA and broaden the effective absorption bandwidth(EAB).Before incorporation of dielectric components,Fe_(3)O_(4) microspheres show a high-effective EMA in C and X bands with the strongest reflection loss(RL)of 70.40 dB at 8.86 GHz and a corresponding EAB of 5.3 GHz(5.3−10.6 GHz).Upon the introduction of dielectric SiO2 or TiO2 coating,the tailored permittivity and the enhanced dielectric loss are obtained by reinforcing the interface polarization.Meanwhile,the structural feature imparts desirable impedance matching and multiple reflection and scattering absorption.As a result,Fe_(3)O_(4)@SiO2 exhibits outstanding EMA performances in C,X,and Ku bands,including an impressive EAB of 6.5 GHz(11.5-18.0 GHz)covering the whole Ku band with only 2.5 mm.Fe_(3)O_(4)@TiO2 achieves a broaden EAB of 8.4 GHz with 3.0 mm,which is better than those of many Fe_(3)O_(4)-based absorbers previously reported.More importantly,both SiO2 and TiO2 coating efficiently enhance the marine anticorrosion properties of Fe_(3)O_(4),making it a superior EMA material with strong and wide absorbing features for EMA application.
