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SFPC課題組吸波材料工作發(fā)表在Nano Research上

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Top期刊,中國科技期刊卓越行動計劃-領(lǐng)軍類期刊項目)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-水熱還原法,通過調(diào)整投料比、預熱溫度、反應溫度、反應時間及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)計為解決C波段的電磁污染提供了可行方案。

本文亮點

1. 通過優(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平衡低頻阻抗匹配,共同提升2D@1D-MC的低頻吸波性能。

3. 當2D@1D-MC 質(zhì)量分數(shù)為20 wt%、厚度為2.8 mm時,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)量分數(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

更多信息見本課題組公眾號(點擊跳轉(zhuǎn))

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