Construction of Co2NiO4@MnCo2O4.5 nanoparticles with multiple hetero-interfaces for enhanced electromagnetic wave absorption (Open Access)--颗粒学报PARTICUOLOGY

Zhang, Y., Tan, S., Zhou, Z., Guan, X., Liao, Y., Li, C., & Ji, G. (2023). Construction of Co2NiO4@MnCo2O4.5 nanoparticles with multiple hetero-interfaces for enhanced electromagnetic wave absorption. Particuology, 81, 86-97. https://doi.org/10.1016/j.partic.2022.12.013

Construction of Co₂NiO₄@MnCo₂O_4.5 nanoparticles with multiple hetero-interfaces for enhanced electromagnetic wave absorption (Open Access)

Yi Zhang ^a, Shujuan Tan ^a *, Zhuoting Zhou ^a, Xiaomeng Guan ^a, Yu Liao ^a, Chen Li ^b, Guangbin Ji ^a

a College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
b School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China

10.1016/j.partic.2022.12.013

Volume 81, October 2023, Pages 86-97

Received 15 November 2022, Revised 29 December 2022, Accepted 31 December 2022, Available online 9 January 2023, Version of Record 19 January 2023.

E-mail: tanshujuan@nuaa.edu.cn

Highlights

• Co₂NiO₄@MnCo₂O_4.5nanoparticles were successfully constructed with multiple magneto-electric loss mechanisms.

• MnCo₂O_4.5 produce more vacancies and contribute to the enhancement of electrical conductivity.

• Nanoneedle arrays provide numerous hetero-interfaces and high specific surface areas for Co₂NiO₄@MnCo₂O_4.5 composites.

• Co₂NiO₄@MnCo₂O_4.5 composites showed a RLmin of -30.01 dB and a superior EAB of 6.12 GHz.

• Maximum reduction of RCS at vertical incidence reaches 19.98 dBm², exhibiting outstanding radar attenuation properties.

Abstract

Nanocomposites with heterogeneous structures and magneto-electric synergistic losses have broad prospects for improving electromagnetic wave (EMW) absorption performance. In this study, we synthesized Co₂NiO₄@MnCo₂O_4.5 nanoparticles with abundant hetero-interfaces and multiple magneto-electric loss mechanisms by a facile hydrothermal method. The excess 0.5 oxygen atoms in MnCo2O4.5 produce more vacancies and contribute to the enhancement of electrical conductivity. Sequential nanoneedle clusters facilitate multiple reflections and absorption of EMW in the materials, which are accompanied by an abundance of heterogeneous interfaces to improve the dielectric loss. The Co₂NiO₄@MnCo₂O_4.5 composites showed a minimum reflection loss (RLmin) of −30.01 dB and a superior effective absorption bandwidth (EAB) of 6.12 GHz (11.88 GHz–18 GHz) at a thickness of 2.00 mm. Computer Simulation Technology (CST) revealed that the obtained particles show very low radar cross-section (RCS) values and almost full coverage angles. The maximum reduction of RCS at vertical incidence reaches 19.98 dB m². The Co₂NiO₄@MnCo₂O_4.5 nanoparticles exhibit outstanding radar attenuation properties, which can effectively inhibit the reflection and scattering of EMW. Therefore, the prepared Co₂NiO₄@MnCo₂O_4.5 absorbers have great application potential in the field of EMW absorption.

Graphical abstract

Keywords

Electromagnetic wave absorption; Effective absorption bandwidth; Nanoparticle; Magneto-electric synergistic loss; Hetero-interfaces

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