Core-Shell FeCoNi Nanoparticles in Carbon Aerogels for Highly Efficient Electromagnetic Wave Absorption

被引:0
作者
Xu, Qingkun [1 ]
Li, Xiaofen [1 ]
He, Hantao [1 ]
Luo, Shuixiu [1 ]
Yu, Yi [1 ]
Xiong, Zuzhou [1 ]
Yuan, Jujun [1 ]
Zhang, Xianke [1 ]
Liu, Xiaoqing [1 ]
Zhu, Xiurong [1 ,2 ]
机构
[1] Gannan Normal Univ, Sch Phys & Elect Informat, Ganzhou 341000, Peoples R China
[2] Tongji Univ, Dept Phys, Shanghai Key Lab Special Artificial Microstruct Ma, Shanghai 200092, Peoples R China
基金
中国国家自然科学基金;
关键词
electromagnetic wave absorption; carbon aerogels; FeCoNi alloys; 1,2-epoxypropane; sol-gel; MICROWAVE-ABSORPTION; PERFORMANCE; PARTICLES; THICKNESS; ALLOY;
D O I
10.1021/acsanm.5c00245
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Utilizing the multiple magnetic resonance properties of polymetallic alloys and considering the high electrical conductivity, porous structure, and high specific surface area of traditional phenolic-aldehyde-based carbon aerogels (CAs), ternary FeCoNi alloy nanoparticle-doped CAs (FeCoNi-CAs) with impressive core-shell structure were prepared via a simplified sol-gel method using 1,2-epoxypropane as a catalyst. The composition, conductivity, morphology, textural characteristics, electromagnetic wave absorption (EMA) properties and mechanisms, and radar cross-section (RCS) values of FeCoNi-CAs were first investigated in detail by adjusting the molar ratio of Fe, Co, and Ni elements. The results revealed that the optimum EMA properties occur at the molar ratio of Fe/Co/Ni = 4:1:5, and its corresponding Fe4Co1Ni5-CAs have a maximum effective absorption bandwidth (EABmax) of 6.21 GHz (10.43-16.64 GHz) at a matching thickness of only 1.91 mm. Meanwhile, it possesses a minimum reflection loss (RLmin) of -54.9 dB and an EAB of 5.61 GHz (11.11-16.72 GHz) at the same matching thickness of only 1.87 mm in the medium- and high-frequency regions. The Fe4Co1Ni5-CAs also show the EABmax of 2.38 GHz (matching thickness: only 3.4 mm, 5.59-7.97 GHz) in the low-frequency region. Further analysis demonstrates that the excellent EMA performance of Fe4Co1Ni5-CAs is mainly ascribed to its higher conductivity stemming from its unique Fe/Co/Ni ratio. Not only does this ratio promote the dielectric loss, but simultaneously, it heightens the magnetic loss. This, in turn, intensifies the combined influence of both dielectric and magnetic losses, giving rise to excellent impedance matching properties. This study could offer a catalyst and a more feasible way to synthesize polymetallic nanoparticle-doped CAs featuring diverse microstructures and superior EMA characteristics.
引用
收藏
页码:5700 / 5712
页数:13
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