作者：Yixuan Han, Mukun He, Jinwen Hu, Panbo Liu, Zhongwu Liu, Zhonglei Ma, Wenbo Ju* and Junwei Gu*
关键字：Electromagnetic interference shielding
论文来源：期刊
具体来源：Nano Research
发表时间：2022年

Yixuan Han, Mukun He, Jinwen Hu, Panbo Liu, Zhongwu Liu, Zhonglei Ma, Wenbo Ju* and Junwei Gu*. Hierarchical Design of FeCo-Based Microchains for Enhanced Microwave Absorption in C band. Nano Research, 2023, 16(1): 1773-1778. 2021IF=10.269（1区材料科学Top期刊，中国科技期刊卓越行动计划-领军类期刊项目）

https://doi.org/10.1007/s12274-022-5111-y

Abstract

FeCo-based magnetic microwave absorbing materials (MAMs) are hydrothermally synthesized via amagnetic-field-induced process. Composition and morphology of the MAMs are capable of being adjusted simultaneously by the atomic ratio of Fe2+ to Co2+ in the precursor. The hierarchical magnetic microchain, which has a core-shell structure of two dimensional FexCo1?xOOH nanosheets anchored vertically on the surface of a one-dimensional (1D) Co microchain, shows significantly enhanced microwave absorption in C band, resulting in a reflection loss (RL) of lower than -20 dB at frequencies ranging from 4.4 to 8.0 GHz under a suitable matching thickness. Magnetic coupling of Co microcrystals and the double-loss mechanisms out of the core-shell structure are considered to promote the microwave attenuation capability. The hierarchical design of 1D magnetic MAMs provides a feasible strategy to solve the electromagnetic pollution in C band.

本文采用磁力诱导-水热还原法，通过调整投料比、预热温度、反应温度、反应时间及NaOH用量等条件合成了FeCo合金纳米颗粒（0D-P）、FeCo合金微米链（1D-MC）及核壳结构FexCo1-xOOH@Co微米链（2D@1D-MC）三种FeCo合金磁性吸波剂及FeCo基微波吸收材料（MAMs）。特殊的核壳结构（二维FexCo1-xOOH纳米片垂直锚定在一维Co微链表面）显著增强了2D@1D-MC材料在C波段的吸波性能，在C波段（4.4 GHz~8.0 GHz）实现小于-20 dB的反射损耗。一维磁性MAMs的分层结构设计为解决C波段的电磁污染提供了可行方案。