Multi-layered nano-hollow spheres for efficient electromagnetic wave absorption.

Ferrite nano-hollow spheres (NHS) are of great significance to improve electromagnetic (EM) wave absorption performance. Herein, the deposition of dielectric SiOand ferrimagnetic CoFeO(CFO) layers on MnFeO(MnFO) NHS are found as an effective strategy to enhance EM wave attenuation. EM wave absorption properties of as-synthesized bare and bi-layered samples are investigated within a widely-used frequency range of 1-17 GHz.