Improved microwave absorption performance with negative permittivity of polyaniline in the Ku-band region

Sutar, R.B.; Kulkarni, Gopal; Jamadar, A.S.; Kandesar, Priyanka; Puri, Vijaya; Yadav, J.B.

doi:10.1016/j.cjph.2021.10.036

Cited by 6 publications

(1 citation statement)

References 52 publications

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“…Therefore, no obvious resonance peaks were observed in T04 with higher Ti contents. For all three samples, the values of ε″ were negative in the high-frequency range (14–18 GHz), which might stem from that the conductive path was formed in HEA/paraffin samples. , The complex permeability decreased as the frequency increased in the range 1–18 GHz (Figure d,e). In detail, the imaginary part of permeability varied in ranges of 1.00–0.13 (T00), 0.80–0.21 (T02), and 0.66–0.07 (T04).…”

Section: Results and Discussionmentioning

confidence: 88%

Enhanced Electromagnetic-Wave Absorbing Performances and Corrosion Resistance via Tuning Ti Contents in FeCoNiCuTi_x High-Entropy Alloys

Yang

Liu

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

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Efficient and stable electromagnetic-wave (EMW) absorption materials have attracted great attention in the field of reducing microwave pollution. Herein, FeCoNiCuTi x high-entropy alloys (HEAs) as electromagneticwave absorbing materials were prepared by a high-energy ball-milling method. The as-milled HEA powders presented a flaky shape with a high aspect ratio. Impedance matching was efficiently optimized by severe lattice distortion, which was caused by Ti incorporation. The introduced plentiful defects in FeCoNiCuTi x HEAs provided abundant polarization sites for dielectric loss. By tuning Ti contents, FeCoNiCuTi 0.2 HEAs delivered excellent EMW absorption performances. The maximal reflection loss (RL max ) values reached −47.8 dB at 10.86 GHz as thin as 2.16 mm, and the widest bandwidth was 4.76 . Furthermore, the introduction of Ti enhanced corrosion resistance via increasing the charge transfer resistance of a passivated film. Those characteristics of FeCoNiCuTi x HEAs made these materials a practical gigahertz-range EMW absorber. Additionally, our findings provided a facile and tunable strategy for designing EMW absorbing materials, which was aimed at lightweight, highly efficient absorption, and resistance to harsh environments.

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Section: Results and Discussionmentioning

confidence: 88%

Enhanced Electromagnetic-Wave Absorbing Performances and Corrosion Resistance via Tuning Ti Contents in FeCoNiCuTi_x High-Entropy Alloys

Yang

Liu

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

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Tunable negative permittivity behavior and excellent electromagnetic shielding performance of pyrolytic carbon‐glass fiber felt/epoxy resin metacomposites

Cui,

Cheng,

et al. 2024

Polymer Composites

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Effective and accurate adjustment of negative permittivity behavior is worthy of further investigation. Herein, pyrolytic carbon‐glass fiber felt/epoxy resin (PyC‐GFF/ER) metacomposites with tunable negative permittivity were prepared using an impregnation‐calcination method. The permittivity, electrical conductivity, and electromagnetic shielding performance of the polymer metacomposites were investigated. Due to the inherent three‐dimensional structural network of GFF, the PyC adhering to the surface of glass fiber easily formed a conductive network in the composites. As the PyC content increased in the ER composites, the conductivity mechanism changed from hopping conduction to metal‐like conduction. The ER composites with high PyC contents showed negative permittivity behavior and the epsilon‐near‐zero response owing to the low frequency plasma state of free electrons in the PyC‐conduction network. By controlling the PyC content, the negative permittivity behavior of ER composites could be effectively tuned. With the increase in PyC content, the values of negative permittivity increased, and the epsilon‐near‐zero frequency shifted to a higher frequency. Moreover, the ER composites with high PyC contents showed excellent electromagnetic shielding properties (29.4 dB) at X‐band. This work not only provided a feasible method to realize the tunable negative permittivity of polymer metacomposites, but also promoted its application in the microwave field.Highlights The pyrolytic carbon‐glass fiber felt/epoxy resin composites were fabricated. The negative permittivity was first reported in the PyC‐GFF/ER composites. Tunable negative permittivity could be well explained by Drude model. The polymer composites had excellent electromagnetic shielding property.

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Progress in percolative composites with negative permittivity for applications in electromagnetic interference shielding and capacitors

Leng,

Yang,

Tang

et al. 2023

Adv Compos Hybrid Mater

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Improved microwave absorption performance with negative permittivity of polyaniline in the Ku-band region

Cited by 6 publications

References 52 publications

Enhanced Electromagnetic-Wave Absorbing Performances and Corrosion Resistance via Tuning Ti Contents in FeCoNiCuTi_x High-Entropy Alloys

Enhanced Electromagnetic-Wave Absorbing Performances and Corrosion Resistance via Tuning Ti Contents in FeCoNiCuTi_x High-Entropy Alloys

Tunable negative permittivity behavior and excellent electromagnetic shielding performance of pyrolytic carbon‐glass fiber felt/epoxy resin metacomposites

Progress in percolative composites with negative permittivity for applications in electromagnetic interference shielding and capacitors

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Improved microwave absorption performance with negative permittivity of polyaniline in the Ku-band region

Cited by 6 publications

References 52 publications

Enhanced Electromagnetic-Wave Absorbing Performances and Corrosion Resistance via Tuning Ti Contents in FeCoNiCuTix High-Entropy Alloys

Enhanced Electromagnetic-Wave Absorbing Performances and Corrosion Resistance via Tuning Ti Contents in FeCoNiCuTix High-Entropy Alloys

Tunable negative permittivity behavior and excellent electromagnetic shielding performance of pyrolytic carbon‐glass fiber felt/epoxy resin metacomposites

Progress in percolative composites with negative permittivity for applications in electromagnetic interference shielding and capacitors

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Enhanced Electromagnetic-Wave Absorbing Performances and Corrosion Resistance via Tuning Ti Contents in FeCoNiCuTi_x High-Entropy Alloys

Enhanced Electromagnetic-Wave Absorbing Performances and Corrosion Resistance via Tuning Ti Contents in FeCoNiCuTi_x High-Entropy Alloys