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<p>In the quest for environmentally friendly materials with enhanced electromagnetic interference (EMI) shielding capabilities, carbon-based materials and metal–organic frameworks (MOFs) have shown significant promise. This study focuses on synthesizing a bimetallic ferromagnetic MOF [MIL-88B(Fe/Co)], in combination with graphene oxide (GO), to assess their EMI shielding performance as a composite. Controlled pyrolysis of the MOF/GO composites with varying GO content (15%, 20%, and 30%) led to partial decomposition of the MOF structure (P-Co-Fe-MOF) while preserving its crystallographic integrity and reducing GO to its reduced form (RGO). The resulting P-Co-Fe-MOF/RGO composites were evaluated at different loadings (0.5&#xa0;g, 1&#xa0;g, 1.5&#xa0;g, and 2&#xa0;g), with the P-Co-Fe-MOF/RGO30 composite exhibiting the highest EMI shielding efficiency. Based on these findings, a double-layer structure was designed, where the first layer was composed of the bimetallic MIL-88B(Fe/Co) framework. The second layer, consisting of pyrolyzed MOF combined with RGO, achieves a remarkable total shielding effectiveness (<i>SE</i><sub><i>T</i></sub>) of 33&#xa0;dB within the X-band range, attenuating nearly 99% of electromagnetic waves. This innovative double-layer structure demonstrates high shielding performance, offering a promising approach for developing effective EMI shielding materials.</p>

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A novel double-layer MIL-88B(Fe/Co)/RGO composite as a superior microwave shielding material

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月29日

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  • Mohamed E. Elmowafy,
  • Mahmoud Zorainy,
  • Osama Abuzalat,
  • Ahmed Baraka,
  • Ramy Sadek,
  • Hesham Tantawy

摘要

In the quest for environmentally friendly materials with enhanced electromagnetic interference (EMI) shielding capabilities, carbon-based materials and metal–organic frameworks (MOFs) have shown significant promise. This study focuses on synthesizing a bimetallic ferromagnetic MOF [MIL-88B(Fe/Co)], in combination with graphene oxide (GO), to assess their EMI shielding performance as a composite. Controlled pyrolysis of the MOF/GO composites with varying GO content (15%, 20%, and 30%) led to partial decomposition of the MOF structure (P-Co-Fe-MOF) while preserving its crystallographic integrity and reducing GO to its reduced form (RGO). The resulting P-Co-Fe-MOF/RGO composites were evaluated at different loadings (0.5 g, 1 g, 1.5 g, and 2 g), with the P-Co-Fe-MOF/RGO30 composite exhibiting the highest EMI shielding efficiency. Based on these findings, a double-layer structure was designed, where the first layer was composed of the bimetallic MIL-88B(Fe/Co) framework. The second layer, consisting of pyrolyzed MOF combined with RGO, achieves a remarkable total shielding effectiveness (SET) of 33 dB within the X-band range, attenuating nearly 99% of electromagnetic waves. This innovative double-layer structure demonstrates high shielding performance, offering a promising approach for developing effective EMI shielding materials.