Enhancing the microwave absorption properties of amorphous CoO nanosheet-coated Co (hexagonal and cubic phases) through interfacial polarizations

Deng, Jiushuai; Li, Shimei; Zhou, Yuanyuan; Liang, Linyun; Zhao, Biao; Zhang, Xi; Zhang, Rui

doi:10.1016/j.jcis.2017.09.029

Cited by 153 publications

(44 citation statements)

References 65 publications

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“…The high‐performance electromagnetic absorption relies on the impedance matching and attenuation constant α, and the higher values of μ′ and ε′ could induce a higher α, as expressed by equations

Z_{normalr} = Z / Z_{0}

Z_{in} = Z_{0} \sqrt{μ_{r} / ε_{normalr}}

ε_{normalr} = ε_{\infty} + \frac{ε_{normals} - ε_{\infty}}{1 + j 2 π f τ} = ε^{'} - j ε^{″}

μ_{r} = μ_{\infty} + \frac{μ_{s} - μ_{\infty}}{1 + j 2 π f τ} = μ^{'} - j μ^{″}

\begin{matrix} α = \frac{\sqrt{2} π f}{c} \times \sqrt{(μ^{″} ε^{″} - μ^{'} ε^{'}) + \sqrt{{(μ^{″} ε^{″} - μ^{'} ε^{'})}^{2} + {(μ^{'} ε^{″} + μ^{″} ε^{'})}^{2}}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

3D Flake‐Like Bi₂Te₃ with Outstanding Lightweight Electromagnetic Wave Absorption Feature

Chen

Liang

Quan

et al. 2018

Part & Part Syst Charact

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Scheme 1 shows the formation and the microwave absorbing mechanism of Bi 2 Te 3 compound. The 3D Bi 2 Te 3 nanosheets were Flake-like semiconductors with strong interfacial polarization exhibit excellent electromagnetic absorption properties. To the best of the knowledge, 3D flakelike Bi 2 Te 3 is never reported as effective MAMs (microwave absorption materials). Herein, it is first introduced the novel lightweight microwave absorption of 3D flake-like Bi 2 Te 3 synthesized by a simple hydrothermal process. Compared with the traditional research objects, the obtained Bi 2 Te 3 possessed prominent absorbing ability at a rather thin thickness (1.0 mm), which will draw much attention to new-materials for electromagnetic wave absorption.

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Z_{normalr} = Z / Z_{0}

Z_{in} = Z_{0} \sqrt{μ_{r} / ε_{normalr}}

ε_{normalr} = ε_{\infty} + \frac{ε_{normals} - ε_{\infty}}{1 + j 2 π f τ} = ε^{'} - j ε^{″}

μ_{r} = μ_{\infty} + \frac{μ_{s} - μ_{\infty}}{1 + j 2 π f τ} = μ^{'} - j μ^{″}

\begin{matrix} α = \frac{\sqrt{2} π f}{c} \times \sqrt{(μ^{″} ε^{″} - μ^{'} ε^{'}) + \sqrt{{(μ^{″} ε^{″} - μ^{'} ε^{'})}^{2} + {(μ^{'} ε^{″} + μ^{″} ε^{'})}^{2}}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

3D Flake‐Like Bi₂Te₃ with Outstanding Lightweight Electromagnetic Wave Absorption Feature

Chen

Liang

Quan

et al. 2018

Part & Part Syst Charact

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“…Furthermore, this suggests that the contribution of σ is dominant over μ r for the high shielding effectiveness (SE) observed in Figure . Furthermore, the addition of YIG in conducting PANI resulted in large interfacial areas for (multiple) scattering of the incoming microwave radiation which further enhanced the net microwave absorption ability of the composite . Therefore, a selective tuning of conductive and magnetic phase in the composite is important in enhancing the microwave absorption.…”

Section: Resultsmentioning

confidence: 99%

Effect of Coral‐Shaped Yttrium Iron Garnet Particles on the EMI Shielding Behaviour of Yttrium Iron Garnet‐Polyaniline‐Wax Composites

et al. 2018

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We report the physicochemical insight into the role of coralshaped yttrium-iron-garnet (YIG) particles for high electromagnetic interference (EMI) shielding behaviour of YIG-polyaniline (PANI)-Wax composites. We studied the total shielding effectiveness (SE T ) of various compositions of the composites in X and K u -band frequencies (8-18 GHz) and came upon with a critical concentration (20 wt% of YIG) for which SE T is maximum (-44.8 dB). At this critical concentration, the coral shape of YIG helps in effectively increasing the YIG-PANI interfaces necessary for the multiple scattering of electromagnetic (EM) waves. The scattered microwave is then trapped within the dense coralnetwork of YIG until they are absorbed therein by PANI via conduction loss; thereby, dramatically enhancing the microwave attenuation. The detailed EMI shielding mechanism is explained based on electrical and magnetic properties of the composites. Our result demonstrates the importance of morphology of the dielectric/magnetic particles and their concentration in the composites for designing an efficient EMI shield.

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“…Therefore, shielding of EMI is very critical for telecommunication signals, electronic device performance, industries operation and human life. Effective EMI shielding must have two functions of reducing undesirable emissions and protecting the component from stray external signals [407][408][409]. EMI shielding effectiveness (SE) is an important parameter to evaluate the absolute effectiveness of shielding materials and is strongly dependent on electrical conductivity and thickness of the shielding materials [410].…”

Section: Electromagnetic Interference Shieldingmentioning

confidence: 99%

Recent progress on nanostructured conducting polymers and composites: synthesis, application and future aspects

et al. 2018

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Enhancing the microwave absorption properties of amorphous CoO nanosheet-coated Co (hexagonal and cubic phases) through interfacial polarizations

Cited by 153 publications

References 65 publications

3D Flake‐Like Bi₂Te₃ with Outstanding Lightweight Electromagnetic Wave Absorption Feature

3D Flake‐Like Bi₂Te₃ with Outstanding Lightweight Electromagnetic Wave Absorption Feature

Effect of Coral‐Shaped Yttrium Iron Garnet Particles on the EMI Shielding Behaviour of Yttrium Iron Garnet‐Polyaniline‐Wax Composites

Recent progress on nanostructured conducting polymers and composites: synthesis, application and future aspects

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Enhancing the microwave absorption properties of amorphous CoO nanosheet-coated Co (hexagonal and cubic phases) through interfacial polarizations

Cited by 153 publications

References 65 publications

3D Flake‐Like Bi2Te3 with Outstanding Lightweight Electromagnetic Wave Absorption Feature

3D Flake‐Like Bi2Te3 with Outstanding Lightweight Electromagnetic Wave Absorption Feature

Effect of Coral‐Shaped Yttrium Iron Garnet Particles on the EMI Shielding Behaviour of Yttrium Iron Garnet‐Polyaniline‐Wax Composites

Recent progress on nanostructured conducting polymers and composites: synthesis, application and future aspects

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3D Flake‐Like Bi₂Te₃ with Outstanding Lightweight Electromagnetic Wave Absorption Feature

3D Flake‐Like Bi₂Te₃ with Outstanding Lightweight Electromagnetic Wave Absorption Feature