Mohamed E. Elmowafy, Mahmoud Zorainy, Osama Abuzalat, Ahmed Baraka, Ramy Sadek, Hesham Tantawy
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A novel double-layer MIL-88B(Fe/Co)/RGO composite as a superior microwave shielding material
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.
期刊介绍：
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.
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