首页|Thermally-driven contraction asymmetric yolk-shell MnSe@C microsphere with boosted dielectric behaviors and microwave absorption

Thermally-driven contraction asymmetric yolk-shell MnSe@C microsphere with boosted dielectric behaviors and microwave absorption

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The conventional selective template etching method to fabricate yolk-shell microwave absorbers is in-convenient and inefficient,so the thermally-driven contraction strategy was used to prepare asymmet-ric yolk-shell MnSe@C microsphere microwave absorbers via self-template directed transformation.The self-templated oriented transformation enables compositional customization and enhances the template utilization.The confinement effect of the carbon shell is crucial for realizing the thermally-driven con-traction strategy and contributes to the strong conduction loss to MnSe@C.On the other hand,the en-hanced polarization loss benefits from the abundant heterogeneous interfaces and defects in the asym-metric yolk-shell MnSe@C microspheres.The rich cavities in the yolk-shell structure not only facilitate optimal impedance matching,but also promote the enhancement of multiple reflection loss(RL).As a result,the asymmetric yolk-shell MnSe@C microspheres obtain excellent microwave absorption perfor-mance,the minimum RL(RLmin)and the maximum effective absorption bandwidth(EAB)reaching-54.4 dB and 5.1 GHz,respectively,at a thickness of 1.9 mm.The successful obtainment of the asymmetric yolk-shell MnSe@C microspheres paves the way for the convenient synthesis of the yolk-shell transition-metal selenides(TMSs)microwave absorbers.

Thermally-driven contractionYolk-shellMnSeMicrowave absorption

Hanxiao Jia、Yuping Duan、Chenxu Dou、Likun Niu、Naibo Wu、Meng Wang

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Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesFundamental Research Funds of Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices

52071053U170425352103334DUT20GF111AFMD-KFJJ-21102

2024

10.1016/j.jmst.2023.10.017

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)：2024.183(16)