Boosting Conductive Loss and Magnetic Coupling Based on “Size Modulation Engineering” toward Lower‐Frequency Microwave Absorption

Author:

Guo Yuan1,Duan Yuping1ORCID,Liu Xiaoji1,Zhang Hao2,Yuan Tingkang2,Wen Ningxuan2,Li Chengwei2,Pan Huifang1,Fan Zeng2,Pan Lujun2

Affiliation:

1. Key Laboratory of Solidification Control and Digital Preparation Technology School of Materials Science and Engineering Dalian University of Technology Dalian Liaoning 116085 P. R. China

2. School of Physics Dalian University of Technology Dalian Liaoning 116024 P. R. China

Abstract

AbstractThe rational design of absorber size is a promising strategy for obtaining excellent electromagnetic wave (EMW) absorption performance. However, achieving controllable tuning of the material size through simple methods is challenging and the associated EMW attenuation mechanisms are still unclear. In this study, the sizes of metal–organic frameworks (MOFs) are successfully tailored by changing the growth time and the molar ratio of iron (Fe)/organic ligands. The lateral and vertical lengths of MOFs vary in the range of 200 nm to 2 µm and 100 nm to 1 µm, respectively. Both experiments and simulations confirm that the decrease of MOF size favors the formation of more conductive networks, which is beneficial for improving the conductivity loss. Meanwhile, the micromagnetic simulation reveals that the magnetic coupling can be effectively enhanced by the decrease of MOF size, which is conducive to the improvement of magnetic loss, especially in low‐frequency range. The reflection loss of Fe‐based MOFs with optimized size reaches −46.4 dB at 6.2 GHz with an effective absorption bandwidth of 3.1 GHz. This work illustrates the important role of size effect in EMW dissipation and provides an effective strategy for enhancing the low‐frequency EMW absorption performance.

Funder

China Postdoctoral Science Foundation

Fundamental Research Funds for the Central Universities

Innovative Research Group Project of the National Natural Science Foundation of China

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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