Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 21st October 2020 from 07:00 AM to 07:00 PM (BST).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 37, 2019
Previous Article Next Article

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

Author affiliations

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

Back to tab navigation

Supplementary files

Article information


Submitted
02 Aug 2019
Accepted
01 Sep 2019
First published
02 Sep 2019

Nanoscale, 2019,11, 17270-17276
Article type
Paper

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

Social activity

Search articles by author

Spotlight

Advertisements