Off/on switchable smart electromagnetic interference shielding aerogel

Liu, Xiaofang; Wang, Yongdong; Sun, Xin; Tang, Wukui; Deng, Gao; Liu, Huan; Song, Zhiming; Yu, Yuanhang; Yu, Rong; Dai, Liming; Shui, Jianglan

doi:10.1016/j.matt.2021.02.022

Cited by 165 publications

(95 citation statements)

References 42 publications

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“…Liu et al. [ 183 ] reported a switchable smart EM shielding aerogel through compression and decompression. The SEM images and corresponding states are shown in Figure 12d .…”

Section: Novel Strategy For Dielectric Loss Mechanism Regulationmentioning

confidence: 99%

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Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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Electromagnetic (EM) wave absorbing materials play an increasingly important role in modern society for their multi-functional in military stealth and incoming 5G smart era. Dielectric loss EM wave absorbers and underlying loss mechanism investigation are of great significance to unveil EM wave attenuation behaviors of materials and guide novel dielectric loss materials design. However, current researches focus more on materials synthesis rather than in-depth mechanism study. Herein, comprehensive views toward dielectric loss mechanisms including interfacial polarization, dipolar polarization, conductive loss, and defect-induced polarization are provided. Particularly, some misunderstandings and ambiguous concepts for each mechanism are highlighted. Besides, in-depth dielectric loss study and novel dielectric loss mechanisms are emphasized. Moreover, new dielectric loss mechanism regulation strategies instead of regular components compositing are summarized to provide inspiring thoughts toward simple and effective EM wave attenuation behavior modulation.

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“…Liu et al. [ 183 ] reported a switchable smart EM shielding aerogel through compression and decompression. The SEM images and corresponding states are shown in Figure 12d .…”

Section: Novel Strategy For Dielectric Loss Mechanism Regulationmentioning

confidence: 99%

mentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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“…Aside from controlling morphology [ 16–18 ] and electron interactions, [ 19,20 ] the careful design and control of other parameters, such as defect levels, [ 21–23 ] electronic conductivity, [ 24 ] composition features, [ 25–27 ] and interfacial construction, [ 28,29 ] become key factors in engineering EMW absorption properties. To regulate defect levels and electronic conductivity, it has been reported that anion doping (such as N, [ 30 ] S, [ 31 ] and P [ 32 ] ) can improve defect levels by degrading crystal lattice and vacancy formation.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering

Liu

Zhang

2021

Adv Funct Materials

104

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Fluorine ion (F − ) regulation engineering rarely has been presented as a promising strategy for obtaining high-performance electromagnetic wave (EMW) absorbing materials, and the related EMW attenuation mechanism has never been elucidated. Herein, a new F − regulation strategy is demonstrated for the first time, giving rise to broad low-/middle-frequency EMW attenuation by synergistically manipulating multiple factors, such as the morphology, composition, interface, defects, and conductivity. It is found that both the F − concentration and its introduction method (i.e., in situ or post-treatment) are significant. Because of the in situ introduced heterointerfaces, the enriched defects, appropriate composition, and electronic conductivity, improvements in impedance matching and F − -regulated dielectric loss are simultaneously achieved. Accordingly, the optimized NiCo 2 S 4 /Co 1−x S/Co(OH)F composite delivered an effective absorption band of 6.03 GHz (4.57-10.60 GHz), which is five times higher than the pure counterpart, making it the only sulfidebased absorber with a broad absorption feature toward the low frequency (from 4 GHz) with a small thickness (<3 mm) to date. In short, this work not only expounds on the unique roles of F − in chemical synthesis, microstructure design, and EMW absorption but also offers a viable strategy for solving the low-/middle-frequency EM interference issues through F − regulation engineering.

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“…Second, it is nonnegligible that carbon shell with hollow structure can build more efficient electronic transmission channel by the physical contacts compared with solid counterparts in the same mass condition, as illustrated in Fig. 5 e, which facilitates the electronic transmission and consumes the microwave energy [ 46 ], resulting in dominant role in conduction loss because the loss that stems from Co/Co 3 O 4 derivatives can be ignored owing to the small size. Besides, the intricate conductive network spontaneously responds to the incident microwave and intensely induces time-varying electromagnetic field-induced current in the circular resistive network, converting electromagnetic energy into thermal energy [ 47 , 48 ].…”

Section: Resultsmentioning

confidence: 99%

Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption

et al. 2022

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Precisely reducing the size of metal-organic frameworks (MOFs) derivatives is an effective strategy to manipulate their phase engineering owing to size-dependent oxidation; however, the underlying relationship between the size of derivatives and phase engineering has not been clarified so far. Herein, a spatial confined growth strategy is proposed to encapsulate small-size MOFs derivatives into hollow carbon nanocages. It realizes that the hollow cavity shows a significant spatial confinement effect on the size of confined MOFs crystals and subsequently affects the dielectric polarization due to the phase hybridization with tunable coherent interfaces and heterojunctions owing to size-dependent oxidation motion, yielding to satisfied microwave attenuation with an optimal reflection loss of −50.6 dB and effective bandwidth of 6.6 GHz. Meanwhile, the effect of phase hybridization on dielectric polarization is deeply visualized, and the simulated calculation and electron holograms demonstrate that dielectric polarization is shown to be dominant dissipation mechanism in determining microwave absorption. This spatial confined growth strategy provides a versatile methodology for manipulating the size of MOFs derivatives and the understanding of size-dependent oxidation-induced phase hybridization offers a precise inspiration in optimizing dielectric polarization and microwave attenuation in theory.

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Off/on switchable smart electromagnetic interference shielding aerogel

Cited by 165 publications

References 42 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering

Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption

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Off/on switchable smart electromagnetic interference shielding aerogel

Cited by 165 publications

References 42 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F− Regulation Engineering

Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption

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Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering