Core-shell structured Fe/ZnO composite with superior electromagnetic wave absorption performance

Core-shell structured iron/zinc oxide (Fe/ZnO) nanocomposites have been successfully prepared via a lowtemperature wet chemical method. The electromagnetic wave absorbing performances of all the Fe/ZnO nanocomposites are significantly improved in comparison with single ?-Fe and ZnO. With the ZnO content increasing, the effective absorption band (reflection loss below -10 dB) moves toward the high frequency orientation. When the thickness is 1.59 mm, the Fe/ZnO nanocomposite with a Fe/Zn ratio of 1:0.75 can gain the optimal reflection loss at 15.55 GHz, which reaches up to -48.28 dB, and the effective absorption bandwidth (reflection loss below -10 dB) is 3.50 GHz (12.925?16.425 GHz). In addition, the maximum effective absorption bandwidth (reflection loss below -10 dB) reaches up to 5.10 GHz (10.79?15.89 GHz) at the thickness of 1.9 mm for Fe/Zn ratio of 1:0.75. The excellent electromagnetic wave absorption performance of Fe/ZnO nanocomposite benefits from the effects of dielectric loss, magnetic loss and suitable impedance matching. Therefore, the Fe/ ZnO nanocomposites are promising to be applied in the field of Ku band wave absorption.

Automated summary

Core-shell structured iron/zinc oxide (Fe/ZnO) nanocomposites were successfully prepared via a low-temperature wet chemical method, demonstrating excellent electromagnetic wave absorption performance and promising applications in the field of Ku band wave absorption.