Issue 37, 2019

Multi-scale magnetic coupling of Fe@SiO2@C–Ni yolk@triple-shell microspheres for broadband microwave absorption

Abstract

Magnetic core@shell and yolk@shell microspheres have received extensive attention; however, the realization of microwave performance enhancement remains a critical challenge for their actual applications. Herein, inspired by multi-scale magnetic coupling interactions, a synchronous in situ reduction process was developed to successfully fabricate Fe@SiO2@C–Ni (FSCN) yolk@triple-shell microspheres based on the Fe3O4@SiO2 substrate. Owing to the unique multi-scale magnetic coupling interactions in their delicate structure, (i) in each microsphere, abundant Ni NPs with optimized size could affect the density distribution and orientation of the magnetic stray field radiating from the Fe core, and (ii) via the coupling interactions between adjacent composite microspheres, the saturation magnetization was significantly enhanced to support strong magnetic loss capability. Moreover, the special yolk@multi-shell structure offered an optimized impedance balance, facilitating the propoagation of the incoming microwaves into the absorber. Both multiple interfacial polarization and synergistic effects from magnetic units (Fe and Ni) and dielectric shell (SiO2 and carbon) contributed to electromagnetic wave attenuation. The FSCN composite material exhibited excellent absorption performance with an intense reflection loss (−45.5 dB) and bandwidth absorption (8.2 GHz and 9.8–18 GHz) at the film thickness of only 2 mm. Our new findings provide important design implications for functional spheres and high-performance lightweight microwave absorbers.

Graphical abstract: Multi-scale magnetic coupling of Fe@SiO2@C–Ni yolk@triple-shell microspheres for broadband microwave absorption

Supplementary files

Article information

Article type
Paper
Submitted
02 ส.ค. 2562
Accepted
01 ก.ย. 2562
First published
02 ก.ย. 2562

Nanoscale, 2019,11, 17270-17276

Multi-scale magnetic coupling of Fe@SiO2@C–Ni yolk@triple-shell microspheres for broadband microwave absorption

X. Shi, W. You, Y. Zhao, X. Li, Z. Shao and R. Che, Nanoscale, 2019, 11, 17270 DOI: 10.1039/C9NR06629B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements