首页|Construction of ZnO/Ni@C hollow microspheres as efficient electromagnetic wave absorbers with thin thickness and broad bandwidth

Construction of ZnO/Ni@C hollow microspheres as efficient electromagnetic wave absorbers with thin thickness and broad bandwidth

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Ingenious microstructure design and rational composition collocation have been proved to be an effec-tive strategy for developing efficient electromagnetic wave(EMW)absorbers.It would be promising to fabricate a hollow structured composite integrating multiple loss mechanisms(conduction,magnetic,and polarization losses)for excellent EMW absorption.Herein,a novel dielectric-magnetic compound of ZnO/Ni@C hollow microsphere was prepared through hydrothermal reactions followed by an in-situ chemical vapor deposition(CVD).In this ternary composite,abundant ZnO/Ni heterostructures formed the hollow microsphere skeletons and provided unique Schottky junctions,which endowed the com-posite with improved impedance matching and strong polarization loss.Meanwhile,the amorphous-polycrystalline carbon layer deposited on the surface of each microsphere enhanced the conduction and interfacial polarization losses.In addition,the magnetic Ni nanoparticles induced magnetic loss.Benefit-ing from the synergistic effect of the hollow structure and multiple loss mechanisms,the ternary com-posite exhibits an effective absorption bandwidth as wide as 6.55 GHz at a thickness of only 1.85 mm,accompanied by a minimum reflection loss of-39.8 dB.Besides,the radar cross-section and the elec-tromagnetic field simulation further verify the superior EMW absorption performance of the composites.Our work provides a new reference for the fabrication of dielectric-magnetic ternary hollow microspheres as EMW absorbers with thin thickness and broad bandwidth.

HollowMultiple loss mechanismsThin thicknessBroad bandwidthElectromagnetic wave absorption

Yuchen Jiang、Hao Zhang、Xueqing Zuo、Chen Sun、Yifeng Zhang、Hui Huang、Zeng Fan、Chengwei Li、Lujun Pan

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School of Physics,Dalian University of Technology,Dalian 116024,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Postdoctoral Science Foundation

52272288519720392021M700658

2024

10.1016/j.jmst.2023.11.023

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.188(21)
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