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Open research questions in Electromagnetic wave absorption materials

150 gap statements mined from Electromagnetic wave absorption materials papers in our 7.9M-paper local library, which holds 4,229 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Further research could be conducted to explore the properties of other types of natural fiber composites with different wire mesh reinforcements. The study could be extended to investigate the effect of varying the density and thickness of the wire mesh on the performance of the composite. Research could also be done to develop new applications for the hybrid wire mesh composite.

    Synergistic improvement of mechanical and EMI shielding capabilities in multifunctional hybrid wire mesh/natural fibre-based composites · 2026 · DOI

  • The need to prevent particle agglomeration during drying. The challenge of minimizing capillary forces during drying to prevent particle agglomeration.

    Dual response of polarisation and magnetisation in MoS₂/Sr-hexaferrite incorporated PVDF composites as EMI shielding material · 2026 · DOI

  • The use of cumbersome, multistep batch processes remains a main concern regarding commercialization. Challenges remain in achieving broadband absorption and minimizing shield thickness. EM pollution causes problems such as system failures, data loss, and signal disturbance and poses a serious threat to communication security and human health.

    Advanced N-Graphene-Based Electromagnetic Shields via Microwave Plasma Induced Synthesis · 2026 · DOI

  • The development of sustainable EMI shielding materials that are lightweight, low-cost, and environmentally friendly. The need to minimize surface reflection and maximize attenuation of EM energy in the absorber. The challenge of achieving effective absorption, which depends on impedance matching and attenuation capability.

    Sustainable Activated Carbon/Poly(vinyl acetate) Composites with Recycled Fillers for Enhanced EMI Shielding Applications · 2026 · DOI

  • The lack of composite materials that can perform both electromagnetic microwave absorption and flame retardancy. The need for novel multifunctional composite materials with unique structural characteristics and customizable functions. The requirement for materials with exceptional EMA performance and strong flame retardancy effects.

    Metal–Organic Framework-Based Composites for Dual Functionalities: Advances in Microwave Absorption and Flame Retardancy · 2025 · DOI

  • There is a need to optimize the electromagnetic shielding effectiveness of carbon nanotubes hydrogel nanocomposites. The current study aims to fill this gap by investigating the dielectric properties of hydrogel nanocomposites with different MWCNT concentrations.

    Electromagnetic Shielding Effectiveness of Carbon Nanotubes Hydrogel Nanocomposites in the Frequency Range from 1.7 to 6.0 GHz · 2025 · DOI

  • Further testing is needed to verify the results of the 0% and 1% mixtures in density and water absorption. Investigation of the effect of MWCNT content on other properties of mortar, such as durability and thermal conductivity. Optimization of the MWCNT content for specific applications and levels of electromagnetic exposure.

    Effect of High Carbon Nanotube Content on Electromagnetic Shielding and Mechanical Properties of Cementitious Mortars · 2025 · DOI

  • The paper identifies the gap in current materials' inability to provide sufficient EM shielding. The study highlights the need for building materials with enhanced EM shielding properties. The research gap is the lack of understanding of the effects of MWCNT addition on the microstructure and mechanical properties of cement mortars.

    Effect of High Carbon Nanotube Content on Electromagnetic Shielding and Mechanical Properties of Cementitious Mortars · 2025 · DOI

  • The lack of understanding of the effect of synthesis conditions on the structure, composition, and electromagnetic properties of FeCoSm/C nanocomposites. The need for new materials with improved electromagnetic properties for use in electronics.

    Influence of Synthesis Conditions on the Structure, Composition, and Electromagnetic Properties of FeCoSm/C Nanocomposites · 2025 · DOI

  • Further research is needed to investigate the effect of different types of ferrite on the properties of rubber composites. The study of the effect of ferrite on the properties of other types of composites could be conducted. Research on the optimization of the ferrite content for optimal absorption-shielding performance could be performed.

    Influence of Manganese–Zinc Ferrite and Ageing on EMI Absorption Shielding Performance and Properties of Rubber Composites · 2025 · DOI

  • Understanding the microstructure-property relationship from the microscopic and macroscopic perspectives, instead of semi-empirical rules, can facilitate the design of microcosmic morphology to adjust the impedance matching and dielectric loss of the carbon-based materials, which are still lacking so far.

    Enhancement in conduction loss induced by morphology engineering for excellent electromagnetic wave absorption · 2024 · DOI

  • The EM environment is becoming more complex, and challenges to EM protection are increasing. Prior work has proposed single-layer metasurface absorbers, but there is a need for a double-layer metasurface design.

    A novel metasurface structure for oblique incidence absorption and ultrawideband transmission based on Haxagonal metal rings and epoxy laminate · 2026 · DOI

  • The development of robust EMI paper that can withstand excessive mechanical stress or severe conditions remains a significant challenge. The exploration of new matrix materials or fillers for EMI shielding paper is needed.

    Flexible carbon/basalt hybrid paper with low electrical conductivity, excellent fire-retardancy, and electromagnetic interference shielding performance · 2026 · DOI

  • The skin-depth limitation in high-performance conductive microwave absorbers remains a challenge. The design of materials with good impedance matching and high energy dissipation is a longstanding problem.

    MXene-enabled induced-current regulation to amplify eddy-current loss in liquid metal composites for efficient microwave absorption · 2026 · DOI

  • The need for high-performance EMI shielding materials that can effectively reduce EMI pollution and enhance information security. The lack of understanding of how filler morphology and multilayer sandwich architecture govern shielding efficiency and related material properties.

    Silver-Based Filler Silicone Rubber Composites for Electromagnetic Interference Shielding Applications · 2026 · DOI

  • Metamaterials usually require multiple materials to build complex structures, which can slow down the 3D printing process.

    Research Progress on High-Temperature-Resistant Electromagnetic Wave Absorbers Based on Ceramic Materials: A Review · 2025 · DOI

  • Limited availability and high cost of indium. Intrinsic brittleness of ITO films. Susceptibility of AgNWs to oxidation under ambient conditions.

    Transparent Conductive Films Based on rGO/AgNW/PET for Electrical Heating and Electromagnetic Interference Shielding Applications · 2026 · DOI

  • Achieving broadband absorption across several microwave bands. Minimizing shield thickness. Developing a low-cost, scalable, and efficient method for manufacturing lightweight, high-performance EM wave absorbers.

    Advanced N-Graphene-Based Electromagnetic Shields via Microwave Plasma Induced Synthesis · 2026 · DOI

  • Investigating the use of other types of waste materials as fillers. Evaluating the potential applications of the composites in real-world scenarios. Optimizing the composition and structure of the composites to improve their microwave absorption performance.

    Sustainable Activated Carbon/Poly(vinyl acetate) Composites with Recycled Fillers for Enhanced EMI Shielding Applications · 2026 · DOI

  • Combining metamaterials with materials with adjustable properties, - Developing new types of high-temperature-resistant electromagnetic wave-absorbing…

    Research Progress on High-Temperature-Resistant Electromagnetic Wave Absorbers Based on Ceramic Materials: A Review · 2025 · DOI

  • Developing metal-based phosphate/doped heteroatom carbon composites for highly efficient and controllable EMA and flame retardancy, - Investigating the properties of polymetallic MOFs for novel high-performance…

    Metal–Organic Framework-Based Composites for Dual Functionalities: Advances in Microwave Absorption and Flame Retardancy · 2025 · DOI

  • Investigating the effects of other types of nanoparticles on electromagnetic radiation shielding, - Exploring the applications of magnetite nanoparticles in other fields, such as medicine and electronics, - Studying the long-term stability and durability of magnetite nanoparticles in various…

    An Investigation into Fe3O4 Nanoparticle-Based Composites for Enhanced Electromagnetic Radiation Shielding · 2025 · DOI

  • The need for effective electromagnetic interference shielding materials - The lack of understanding of the impact of ferrite content and ageing on the properties of rubber…

    Influence of Manganese–Zinc Ferrite and Ageing on EMI Absorption Shielding Performance and Properties of Rubber Composites · 2025 · DOI

  • Investigating the scalability of the fabrication route. Exploring the performance of the composites at higher frequencies. Applying the induced-current regulation strategy to other high-performance conductive microwave absorbers.

    MXene-enabled induced-current regulation to amplify eddy-current loss in liquid metal composites for efficient microwave absorption · 2026 · DOI

  • Investigating other types of fillers and their effects on EMI shielding performance, - Exploring the application of sandwich-structured composites in various…

    Silver-Based Filler Silicone Rubber Composites for Electromagnetic Interference Shielding Applications · 2026 · DOI

Most-cited papers in Electromagnetic wave absorption materials

Most recent work

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Open questions raised by papers listed on this page include: (1) Further research could be conducted to explore the properties of other types of natural fiber composites with different wire mesh reinforcements (“Synergistic improvement of mechanical and EMI shielding capabilities in…”, 2026); (2) Prior work has proposed single-layer metasurface absorbers, but there is a need for a double-layer metasurface design (“A novel metasurface structure for oblique incidence absorption and…”, 2026); (3) The exploration of new matrix materials or fillers for EMI shielding paper is needed (“Flexible carbon/basalt hybrid paper with low electrical conductivity, excellent…”, 2026); (4) The lack of understanding of how filler morphology and multilayer sandwich architecture govern shielding efficiency and related material properties (“Silver-Based Filler Silicone Rubber Composites for Electromagnetic Interference…”, 2026); (5) The lack of composite materials that can perform both electromagnetic microwave absorption and flame retardancy (“Metal–Organic Framework-Based Composites for Dual Functionalities: Advances in…”, 2025). 150 gap statements have been mined from Electromagnetic wave absorption materials papers in our 7.9M-paper local library, which holds 4,229 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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