Enhanced electromagnetic microwave absorbing performance of carbon nanostructures for RAMs: A review

Sani, Yusuf; Azis, Raba'ah Syahidah; Ismail, Ismayadi; Yaakob, Yazid; Mohammed, J.

doi:10.1016/j.apsadv.2023.100455

Applied Surface Science Advances

2023

DOI: 10.1016/j.apsadv.2023.100455

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Enhanced electromagnetic microwave absorbing performance of carbon nanostructures for RAMs: A review

Yusuf Sani,

Raba'ah Syahidah Azis,

Ismayadi Ismail

et al.

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2024

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Cited by 20 publications

(1 citation statement)

References 192 publications

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“…The fundamental method of operation for microwave absorbers is to first transform microwave energy via a specific physical mechanism into a different kind of energy, and then to use a dissipation motion to transform that new type of energy back into heat energy. A high-performance microwave absorber must have a broad bandwidth and excellent absorption 10,11 . These materials are essential for a wide range of military and civil applications, such as healthcare, warfighter anti-radar monitoring, national defense security, and electronic reliability.…”

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Development of high performance microwave absorption modified epoxy coatings based on nano-ferrites

Abd El-Gawad,

Eldesouki,

Abd El-Ghany

2024

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With the rapid spread of wireless technologies and increasing electromagnetic energy, electromagnetic waves (EMW) have become a severe threat to human health. Therefore, minimizing the harmful effects of electromagnetic wave radiation is possible through the development of high-efficiency EMW absorption coatings. The aim of this work was to generate microwave absorbance coatings containing synthesized nano-CuFe2O4 and nano-CaFe2O4. Firstly, nano-CuFe2O4 and nano-CaFe2O4 were synthesized using the sol–gel method. Then, their structure, electrical, dielectric, and magnetic properties were investigated to find out the possibility of using these materials in high-frequency applications (e.g., microwave absorbance coatings). After that, two dosages (2.5 wt% and 5 wt%) of nano-CuFe2O4 and nano-CaFe2O4 were incorporated into epoxy resin to prepare modified epoxy resin as microwave coatings. The dielectric studies show that the AC conductivity of the prepared samples is high at high frequencies. Additionally, the magnetic properties reveal a low coercivity value, making these samples suitable for high-frequency devices. The microwave results illustrate that adding nano-ferrites with high content enhances the absorption characteristics of the tested films. The results showed that the two films have two absorption bands with RL < –10 dB ranging from 10.61 to 10.97 GHz and from 10.25 to 11.2 GHz. The minimum return loss achieved for the two cases is −13 and −16 dB, respectively. Indicating that the film coated with CuFe has a better absorption value than the one coated with CaFe.

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mentioning

confidence: 99%

Development of high performance microwave absorption modified epoxy coatings based on nano-ferrites

Abd El-Gawad,

Eldesouki,

Abd El-Ghany

2024

Sci Rep

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Microwave Properties of Composite Films Based on Polyvinyl Chloride and Brominated Activated Carbon

Grishchenko,

Zhytnyk,

Matushko

et al. 2024

ChemistrySelect

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Brominated activated carbon (AC/Br2) powder was used as a filler in poly(vinyl chloride) (PVC) to prepare PVC‐based composite films by hot pressing. The AC/Br2 filler was obtained by liquid phase bromination and contained both oxygen and bromine. In comparison with the unmodified AC, the AC/Br2 was subjected to thermogravimetric analysis in air and argon and temperature‐programmed desorption mass spectrometry in vacuum, which identified carbon‐oxygen and bromine groups and showed the comparable thermal stability of AC/Br2 and AC. XPS shows the predominance of phenolic groups among the carbon‐oxygen groups. Scanning electron microscopy and transmission electron microscopy showed preserved morphology and microstructure, while N2 adsorption showed a microporosity decrease after bromination. FTIR analysis suggested non‐chemical interactions between PVC and AC/Br2. As the AC/Br2 content in the PVC‐based composite films increases from 0.2 to 30 wt %, the electromagnetic radiation (EMR) reflection at Ka‐band microwave frequencies increases. To reduce the EMR reflection, the proposed composite films should contain a maximum of 0.2 wt % AC/Br2. The results indicate that the microwave properties of PVC‐based composite films can be tuned by adjusting the AC/Br2 content.

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Improved Interfacial Interactions by Core–Shell CoFe₂O₄@SiO₂ Composites to Enhance the Ability of Corrosion Resistance and Electromagnetic Wave Absorption

Wei,

Sun,

et al. 2024

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With the rapid development of science and technology, stealth and anti‐corrosion activities in oceans have attracted widespread attention. This study successfully prepares CoFe2O4@SiO2 with a core–shell structure. This core–shell structure endows the CoFe2O4@SiO2 with good impedance matching and interfacial polarization. Thus, the CoFe2O4@SiO2 exhibits an excellent electromagnetic wave absorption performance with a minimum reflection loss of −45.16 dB. Moreover, the CoFe2O4@SiO2 exhibits an excellent dispersion ability in epoxy. The corrosion resistance of the CoFe2O4@SiO2/epoxy is enhanced. After 60 days of immersion, the low‐frequency impedance modulus of the CoFe2O4@SiO2/epoxy is still >109 Ω cm2. The CoFe2O4@SiO2 realize the dual functions of stealth and anti‐corrosion, which provide ideas for developing marine stealth applications.

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Enhanced electromagnetic microwave absorbing performance of carbon nanostructures for RAMs: A review

Cited by 20 publications

References 192 publications

Development of high performance microwave absorption modified epoxy coatings based on nano-ferrites

Development of high performance microwave absorption modified epoxy coatings based on nano-ferrites

Microwave Properties of Composite Films Based on Polyvinyl Chloride and Brominated Activated Carbon

Improved Interfacial Interactions by Core–Shell CoFe₂O₄@SiO₂ Composites to Enhance the Ability of Corrosion Resistance and Electromagnetic Wave Absorption

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Enhanced electromagnetic microwave absorbing performance of carbon nanostructures for RAMs: A review

Cited by 20 publications

References 192 publications

Development of high performance microwave absorption modified epoxy coatings based on nano-ferrites

Development of high performance microwave absorption modified epoxy coatings based on nano-ferrites

Microwave Properties of Composite Films Based on Polyvinyl Chloride and Brominated Activated Carbon

Improved Interfacial Interactions by Core–Shell CoFe2O4@SiO2 Composites to Enhance the Ability of Corrosion Resistance and Electromagnetic Wave Absorption

Contact Info

Product

Resources

About

Improved Interfacial Interactions by Core–Shell CoFe₂O₄@SiO₂ Composites to Enhance the Ability of Corrosion Resistance and Electromagnetic Wave Absorption