Dimensional Design and Core–Shell Engineering of Nanomaterials for Electromagnetic Wave Absorption

Wu, Zhihua; Cheng, Huhu; Jin, Chen; Yang, Bintong; Xu, Chunyang; Pei, Ke; Zhang, Huibin; Yang, Ziqi; Che, Renchao

doi:10.1002/adma.202107538

Cited by 486 publications

(276 citation statements)

References 256 publications

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“…including morphology design, [3] heterojunction construction, [4] and magnetoelectric incorporation. [5] Although substantial progresses have been made, a series of fatal shortcomings also inevitably tail as follows: 1) The optimization of electronic conductivity is most commonly dependent on importing other high-conductivity materials, but seldom involves optimizing intrinsic defect active sites, so the scope for improvement is slender and unfavorable for EM parameter modulation; 2) The absorption capacity based on above traditional strategies is still far from the broadband absorption for future application; 3) A preferred dissipation mechanism in these dielectric loss materials is still in infancy due to its compositing feature in the most of currently reports.…”

mentioning

confidence: 99%

Anion‐Doping‐Induced Vacancy Engineering of Cobalt Sulfoselenide for Boosting Electromagnetic Wave Absorption

Liu

Zhang

2022

Adv Funct Materials

132

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Vacancy engineering is an attractive approach to modulate the electronic structure of transition metal chalcogens. However, illustrating how anion vacancy can be engineered to tailor their electromagnetic (EM) parameters and electromagnetic wave (EMW) absorption, based on clear vacancy concentrations and/or various anion vacancies rather than semiempirical rules, is currently lacking but significantly desired. An anion-doping-induced vacancy engineering is pioneered, where the selective oxidation process upgrades the transformation from Co-based precursor to S-doped CoSe 2 (System II) instead of Se-doped CoS 2 (System I) in the subsequent sulfuration/selenization, which results in vacancy level improvement and coexistence of sulfur vacancies (V S ) and selenium vacancy (V Se ). Thanks to the boosted dielectric polarization loss provided by the comparable coexistence of sulfur/selenium vacancies (V S /V Se = 0.52), S-doped CoSe 2 harvests a broad bandwidth of 9.25 GHz (8.75-18.00 GHz) at 2.42 mm. This feature almost simultaneously achieves 100% coverage for X-, and Ku-bands, outperforming all reported metal sulfides/selenides until now. This work establishes a clear correlation between vacancy concentrations/various anion vacancies and EMW dissipation ability, offering valuable insights for designing advanced EMW absorbing materials.

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mentioning

confidence: 99%

Anion‐Doping‐Induced Vacancy Engineering of Cobalt Sulfoselenide for Boosting Electromagnetic Wave Absorption

Liu

Zhang

2022

Adv Funct Materials

132

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“…With the ever-increasing demand of electronic safety defense technology, smart microwave absorption devices with flexible characteristics, lightweight, ultrathin thickness, and high efficient performance are significantly pursued and promoted in civil and military electronic instruments [ 1 , 2 ]. In recent decades, tremendous efforts have been attempted to develop functional absorbers to solve the serious electromagnetic radiation pollution; therefore, many promising candidates, such as carbon nanotubes [ 3 ], graphene [ 4 – 6 ], Mxene [ 7 ], and metal oxide/sulfide [ 8 , 9 ], have attracted considerable attention, especially for their hybrid composites with multiple magnetic–dielectric components.…”

Section: Introductionmentioning

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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“…[ 1 , 2 , 3 , 4 , 5 ] To utilize heterointerfaces to tailor electromagnetic properties and realize high absorption efficiency, an appropriate composite system should be selected and investigated. [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ] However, the precise design and systematic mechanism researches on heterointerfaces for MA have been rarely reported. Fe‐based materials have been regarded as the promising candidates for MA owing to their high conductivity and strong magnetic loss ability.…”

Section: Introductionmentioning

confidence: 99%

Customizing Heterointerfaces in Multilevel Hollow Architecture Constructed by Magnetic Spindle Arrays Using the Polymerizing‐Etching Strategy for Boosting Microwave Absorption

Liu

et al. 2022

Advanced Science

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Heterointerface engineering is evolving as an effective approach to tune electromagnetic functional materials, but the mechanisms of heterointerfaces on microwave absorption (MA) remain unclear. In this work, abundant electromagnetic heterointerfaces are customized in multilevel hollow architecture via a one‐step synergistic polymerizing‐etching strategy. Fe/Fe3O4@C spindle‐on‐tube structures are transformed from FeOOH@polydopamine precursors by a controllable reduction process. The impressive electromagnetic heterostructures are realized on the Fe/Fe3O4@C hollow spindle arrays and induce strong interfacial polarization. The highly dispersive Fe/Fe3O4 nanoparticles within spindles build multi‐dimension magnetic networks, which enhance the interaction with incident microwaves and reinforce magnetic loss capacity. Moreover, the hierarchically hollow structure and electromagnetic synergistic components are conducive to the impedance matching between absorbing materials and air medium. Furthermore, the mechanisms of electromagnetic heterointerfaces on the MA are systematically investigated. Accordingly, the as‐prepared hierarchical Fe/Fe3O4@C microtubes exhibit remarkable MA performance with a maximum refection loss of −55.4 dB and an absorption bandwidth of 4.2 GHz. Therefore, in this study, the authors not only demonstrate a synergistic strategy to design multilevel hollow architecture, but also provide a fundamental guide in heterointerface engineering of highly efficient electromagnetic functional materials.

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Dimensional Design and Core–Shell Engineering of Nanomaterials for Electromagnetic Wave Absorption

Cited by 486 publications

References 256 publications

Anion‐Doping‐Induced Vacancy Engineering of Cobalt Sulfoselenide for Boosting Electromagnetic Wave Absorption

Anion‐Doping‐Induced Vacancy Engineering of Cobalt Sulfoselenide for Boosting Electromagnetic Wave Absorption

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

Customizing Heterointerfaces in Multilevel Hollow Architecture Constructed by Magnetic Spindle Arrays Using the Polymerizing‐Etching Strategy for Boosting Microwave Absorption

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