Dimensional design of Fe0.9Co0.1 nano-alloys with enhanced low-frequency microwave absorption

Hu，Renchao1,2; Li，Li1,2; Xu，Xinwei1,2; Pan，Desheng1,2; Dong，Jiufeng1,2; Zhen，Cheng1; Gu，M. Danny3; Wang，Hong1,2

2024-02-15

10.1016/j.cej.2024.148864

Chemical Engineering Journal   影响因子和分区

1385-8947

Low-frequency microwave absorbing materials are critical for enabling radar stealth and interference resistance in gigahertz communication devices and electronic equipment. However, long-wavelength electromagnetic waves are not easily attenuated, due to the limitations of current absorbing materials, including low permeability and a lack of electromagnetic wave loss mechanisms at low frequencies. Herein, we design and prepare one- and two-dimensional FeCo nanoalloys with high permeability through an organic templating method combined with a constrained transformation strategy. We systematically investigate the impact of the anisotropy of monodisperse FeCo nanoalloys on low-frequency microwave absorption performance. The generous specific surface area of FeCo nanosheets facilitate multiple reflections and the scattering of electromagnetic waves within the absorber. This phenomenon, coupled with dielectric resonance, culminates in a maximum reflection loss value of − 48.7 dB at 4.2 GHz. More significantly, FeCo nanorods exhibit an absorption intensity of − 35.3 dB at a notably lower frequency of 2.5 GHz, outperforming existing materials, in addition to an efficient absorption bandwidth of 4.2 GHz at a thickness of only 0.7 mm. Through a combination of experimental investigations and finite element simulations, we identify that highly anisotropic magnetic nanorods demonstrate a robust magnetic coupling interaction, substantial interface polarization and quasi-antenna effect. These characteristics result in enhanced low-frequency electromagnetic losses. Our findings indicate that the high anisotropy of the FeCo nanoalloys significantly improves their microwave absorption performance, thus emphasizing their substantial potential in the development of efficient low-frequency microwave absorbers.

Microwave absorption Nano-alloys Shape anisotropy Simulation

SCI

英语

第一 ; 通讯

ENGINEERING

2-s2.0-85183650362

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices & Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen,518055,China
3.Eastern Institute for Advanced Study,Eastern Institute of Technology,Ningbo,Zhejiang,315200,China

Hu，Renchao,Li，Li,Xu，Xinwei,et al. Dimensional design of Fe0.9Co0.1 nano-alloys with enhanced low-frequency microwave absorption[J]. Chemical Engineering Journal,2024,482.

Hu，Renchao.,Li，Li.,Xu，Xinwei.,Pan，Desheng.,Dong，Jiufeng.,...&Wang，Hong.(2024).Dimensional design of Fe0.9Co0.1 nano-alloys with enhanced low-frequency microwave absorption.Chemical Engineering Journal,482.

Hu，Renchao,et al."Dimensional design of Fe0.9Co0.1 nano-alloys with enhanced low-frequency microwave absorption".Chemical Engineering Journal 482(2024).