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(lèi)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(guò)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。
本文亮點(diǎn)
1. 通過(guò)優(yōu)化調(diào)控前驅(qū)體溶液中的Fe2+和Co2+比例成功合成制備出了顆粒狀0D-P、長(zhǎng)鏈狀1D-MC、核殼鏈狀2D@1D-MC三種FeCo合金磁性吸波劑。
2. FexCo1-xOOH@Co合金磁性吸波劑中的長(zhǎng)鏈結(jié)構(gòu)有助于提升電損耗，核殼結(jié)構(gòu)的引入也能夠在提升磁損耗的同時(shí)平衡低頻阻抗匹配，共同提升2D@1D-MC的低頻吸波性能。
3. 當(dāng)2D@1D-MC 質(zhì)量分?jǐn)?shù)為20 wt%、厚度為2.8 mm時(shí)，其RLmin和fE分別為-48.8 dB和3.4 GHz（7.2~10.6 GHz），優(yōu)于同等質(zhì)量分?jǐn)?shù)的0D-P（-7.2 dB，0 GHz）和1D-MC（-32.6 dB和5.0 GHz（13.0~18.0 GHz））。厚度大于3 mm的2D@1D-MC/石蠟復(fù)合材料在C波段具有良好的微波吸收能力，而0D-P和1D-MC不能有效吸收C波段的微波。
第一作者：韓逸旋
郵件地址：hanyixuan@mail.nwpu.edu.cn
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