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區材料科學Top期刊，中國科技期刊卓越行動計劃-領軍類期刊項目）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）及核殼結構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）。特殊的核殼結構（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）實現小于-20 dB的反射損耗。一維磁性MAMs的分層結構設計為解決C波段的電磁污染提供了可行方案。
本文亮點
1. 通過優化調控前驅體溶液中的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構有助于提升電損耗，核殼結構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 質量分數為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），優于同等質量分數的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）