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Low-Dimensional Electromagnetic Functional Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Electronic Materials".

Deadline for manuscript submissions: closed (20 October 2024) | Viewed by 2549

Special Issue Editor


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Guest Editor
School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, China
Interests: low-dimensional electromagnetic functional materials; energy storage materials

Special Issue Information

Dear Colleagues,

Electromagnetic functional materials refer to electromagnetic protection materials (including microwave absorption and electromagnetic interference shielding materials), as well as materials with electromagnetic protection properties and other applications. With the arrival of the 5G era, electromagnetic pollution is becoming increasingly serious, and the key to solving electromagnetic pollution is to develop electromagnetic protection materials. Electromagnetic protection materials have become one of the most frequently debated topics in the field of materials research.

Long-term research has shown that low-dimensional materials (usually referring to one-dimensional and two-dimensional materials) have significant advantages in the field of electromagnetic protection, such as a high specific surface area, strong electron transfer ability, and natural defects. A high specific surface area makes it easier to design structures, a strong electron transfer ability can effectively form a surface current to reflect electromagnetic waves, and natural defects can effectively form dipole polarization to effectively attenuate electromagnetic waves. Therefore, introducing low-dimensional materials into the field of electromagnetic protection will be the main development trend of future electromagnetic protection materials.

In recent years, in order to meet the ever-changing military and civilian market demands, electromagnetic protection materials need to meet more application requirements, such as flexible wearability, oxidation resistance, and flame retardancy, among others, including developing into a multifunctional and integrated electromagnetic functional material based on electromagnetic protection applications.

It is my pleasure to invite you to submit a manuscript to this Special Issue. Full papers, communications, and reviews are all welcome.

Dr. Peng He
Guest Editor

Manuscript Submission Information

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Keywords

  • microwave absorption
  • electromagnetic interference shielding
  • low-dimensional materials
  • multifunctional electromagnetic protection

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Published Papers (2 papers)

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Research

21 pages, 9099 KiB  
Article
Transmission and Reflection Properties of Iron Pyrite-Epoxy Resin Composite for Electromagnetic Applications
by Mukilan Poyyamozhi, Balasubramanian Murugesan, Narayanamoorthi Rajamanickam, Devesh Kr Pandey and Ahmed Emara
Materials 2024, 17(22), 5456; https://doi.org/10.3390/ma17225456 - 8 Nov 2024
Viewed by 1108
Abstract
This study examines the electromagnetic properties of a composite material composed of iron pyrite (FeS2) and epoxy resin, mixed in a 3:2 weight ratio to create a 10 cm3 cube. The research analyzes transmission and reflection coefficients and band gap [...] Read more.
This study examines the electromagnetic properties of a composite material composed of iron pyrite (FeS2) and epoxy resin, mixed in a 3:2 weight ratio to create a 10 cm3 cube. The research analyzes transmission and reflection coefficients and band gap parameters to determine its viability as an antenna substrate for electromagnetic wave applications. The composite displays a tunable band gap of 1.3 eV, enabling selective absorption and emission of electromagnetic radiation. The transmission coefficient achieved 90% throughout a frequency range of 1 GHz to 15 GHz, whilst the reflection coefficient was measured at 10%, significantly reducing reflecting losses. The epoxy resin binder was essential for preserving structural integrity and augmenting the dielectric characteristics of the composite, thereby raising transmission efficiency. UV-Vis spectroscopy showed an absorption value of 0.875% at the band gap, indicating efficient interaction with UV energy. The S21 transmission coefficient ranged from −10 dB to −80 dB, with a maximum of −40 dB at 6 GHz, indicating strong energy transfer capability for antenna applications. The S21 values exhibited negligible signal attenuation between 2 GHz and 7 GHz, indicating the material’s exceptional suitability for antenna substrates necessitating dependable transmission. The S11 reflection coefficient varied from −5 dB to −55 dB, with substantial decreases between 4 GHz and 14 GHz, when reflection decreased to −45 dB, signifying little signal reflection at essential frequencies. The results underscore the composite’s appropriateness for applications requiring high transmission efficiency, little reflection, and effective engagement with electromagnetic waves, especially as an antenna substrate. Measurements were performed using a vector network analyzer (VNA) to obtain the S11 and S21 characteristics, underscoring the material’s potential in sophisticated electromagnetic applications. Full article
(This article belongs to the Special Issue Low-Dimensional Electromagnetic Functional Materials)
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17 pages, 4457 KiB  
Article
Modulating Electrical Properties of Ti64/B4C Composite Materials via Laser Direct Manufacturing with Varying B4C Contents
by Wenshu Zhang, Hui Chang, Ning Dang and Lian Zhou
Materials 2024, 17(17), 4184; https://doi.org/10.3390/ma17174184 - 23 Aug 2024
Cited by 1 | Viewed by 860
Abstract
The modulation of electrical properties in composite materials is critical for applications requiring tailored electrical functionality, such as electromagnetic shielding and absorption. This study focuses on Ti64/B4C composites, a material combination promising enhanced electromagnetic properties. Laser direct manufacturing (LDM) was utilized [...] Read more.
The modulation of electrical properties in composite materials is critical for applications requiring tailored electrical functionality, such as electromagnetic shielding and absorption. This study focuses on Ti64/B4C composites, a material combination promising enhanced electromagnetic properties. Laser direct manufacturing (LDM) was utilized to fabricate coaxial samples of Ti64 blended with TiB and TiC in various mass ratios, with sample thicknesses ranging from 0.5 mm to 3.5 mm. The electrical characterization involved assessing the dielectric and magnetic permeability, as well as impedance and reflectance, across a frequency spectrum of 2 to 18 GHz. The result reveals that TiC, when incorporated into Ti64, exhibits strong dielectric polarization and achieves a reflectivity as low as −40 dB between 7 and 14 GHz. Conversely, TiB demonstrates effective electromagnetic absorption, with reflectivity values below −10 dB in the frequency band of 8.5 to 11.5 GHz. The study also notes that a lower B4C content enhances electronic polarization and increases the dielectric coefficient, while higher contents favor ionic polarization. This shift can lead to a timing mismatch in the establishment of electron and ion polarization, resulting in a decreased dielectric coefficient. In addition, adjusting the B4C content in Ti64/B4C composites effectively modulates their electrical properties, suggesting a strategic approach to designing materials for specific electromagnetic functions. Full article
(This article belongs to the Special Issue Low-Dimensional Electromagnetic Functional Materials)
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