[Nano Research] Hierarchical Design of FeCo-Based Microchains for Enhanced Microwave Absorption in C band
writer：Yixuan Han, Mukun He, Jinwen Hu, Panbo Liu, Zhongwu Liu, Zhonglei Ma, Wenbo Ju* and Junwei Gu*
keywords：Electromagnetic interference shielding
source：期刊
specific source：Nano Research
Issue time：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區(qū)材料科學(xué)Top期刊，中國(guó)科技期刊卓越行動(dòng)計(jì)劃-領(lǐng)軍類期刊項(xiàng)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.
本文采用磁力誘導(dǎo)-水熱還原法，通過調(diào)整投料比、預(yù)熱溫度、反應(yīng)溫度、反應(yīng)時(shí)間及NaOH用量等條件合成了FeCo合金納米顆粒（0D-P）、FeCo合金微米鏈（1D-MC）及核殼結(jié)構(gòu)FexCo1-xOOH@Co微米鏈（2D@1D-MC）三種FeCo合金磁性吸波劑及FeCo基微波吸收材料（MAMs）。特殊的核殼結(jié)構(gòu)（二維FexCo1-xOOH納米片垂直錨定在一維Co微鏈表面）顯著增強(qiáng)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）實(shí)現(xiàn)小于-20 dB的反射損耗。一維磁性MAMs的分層結(jié)構(gòu)設(shè)計(jì)為解決C波段的電磁污染提供了可行方案。