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Synthesis of Fe/Co bimetallic metal–organic framework‐derived composites and their enhanced electromagnetic wave absorption

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Abstract

Metal-organic frameworks (MOFs) have been garnering considerable attention for application in high‐performance electromagnetic wave absorber owing to their unique ability to reduce the reflection of waves, thereby preventing the deterioration of electronics and human health. To further enhance their absorption performance, this study synthesized uniform‐particle‐sized Fe/Co bimetallic MOF derivatives of CoFe2O4 and FeCo/C via calcination and pyrolysis, respectively, of the MIL‐88A‐structured FeCo‐MOF. In general, MOF derivatives of CoFe2O4 and FeCo/C primarily function as central regulators of dielectric properties and a source of high polarization loss and conductive loss, respectively, in addition to a high magnetic loss. The integration of homogenous MOF derivatives contributes to the synergistic effects that aid in achieving a suitable impedance matching with a strong attenuation capacity to form an improved absorber. Upon regulating the proportion of the derivatives, a minimum reflection loss of − 52.29 dB at 10.78 GHz at a thickness of 1.9 mm and an effective bandwidth of 7.23 GHz (19.24–26.47 GHz) below − 10 dB at a thickness of 0.9 mm were achieved. Therefore, this study presents a new strategy to design excellent electromagnetic wave absorbers with strong absorption and broad effective bandwidth at a low matching thickness for comprehensive applications.

Graphical abstract

The electromagnetic wave absorption performance is optimized through the synergistic effects of the hybridization of MOF derivatives.

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Funding

This work was supported by the Fundamental Research Program (PNK9420) of the Korea Institute of Materials Science (KIMS).

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  1. Jae Ryung Choi and Eunyeong Cho are contributed equally to this work.

Authors and Affiliations

  1. Composites Research Division, Korea Institute of Materials Science (KIMS), Changwon, 51508, Korea

    Jae Ryung Choi, Eunyeong Cho, Horim Lee, Sang‐Bok Lee & Hee Jung Lee

  2. Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, Korea

    Jae Ryung Choi & Woong‐Ryeol Yu

  3. Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, Korea

    Eunyeong Cho & Jeonghun Kim

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Contributions

Jae Ryung Choi: Conceptualization, Formal analysis, Writing—review & editing. Eunyeong Cho: Methodology, Investigation, Writing—original draft. Horim Lee: Validation, Data curation. Sang‐Bok Lee: Visualization, Funding acquisition. Woong‐Ryeol Yu: Formal analysis, Supervision. Jeonghun Kim: Methodology, Supervision. Hee Jung Lee: Supervision, Project administration, Funding acquisition.

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Choi, J.R., Cho, E., Lee, H. et al. Synthesis of Fe/Co bimetallic metal–organic framework‐derived composites and their enhanced electromagnetic wave absorption. Adv Compos Hybrid Mater 7, 26 (2024). https://doi.org/10.1007/s42114-023-00824-z

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