Abstract
Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.
Highlights
It is well known that the structure of materials plays an important role in their thermo-mechanical behavior and transport properties
A lot of efforts have been directed towards the research and development of microwave absorbing materials (MAMs) [14,15]
The above research shows that the Fe3 O4 hollow spheres with low density have very good application prospects in the field of microwave absorption, and that it is feasible to adjust the electromagnetic characteristics of Fe3 O4 hollow spheres by morphology control
Summary
It is well known that the structure of materials plays an important role in their thermo-mechanical behavior and transport properties. With the wide application of communication technology and electromagnetic equipment in GHz, electromagnetic radiation has resulted in unprecedented pollution and seriously endangered human health [10,11,12,13] To solve this problem, a lot of efforts have been directed towards the research and development of microwave absorbing materials (MAMs) [14,15]. The above research shows that the Fe3 O4 hollow spheres with low density have very good application prospects in the field of microwave absorption, and that it is feasible to adjust the electromagnetic characteristics of Fe3 O4 hollow spheres by morphology control. The relationships among solvothermal reaction time, structure of Fe3 O4 hollow spheres and electromagnetic properties were discussed
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