Conductive WS2-NS/CNTs hybrids based 3D ultra-thin mesh electromagnetic wave absorbers with excellent absorption performance

Zhang, Deqing; Wang, Honghan; Cheng, Junye; Han, Changyu; Yang, Xiaojing; Xu, Jingyu; Shan, Guangcun; Zheng, Guang; Cao, Mao‐Sheng

doi:10.1016/j.apsusc.2020.147052

Cited by 145 publications

(32 citation statements)

References 51 publications

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“…[22] Herein, the value of Δε′ was used to characterize the strength of the FD effect. The Δε′ (2-18 GHz) values of C1, C2, and C3 are 2.67, 7.86, and 12.49, respectively, which confirms the heterogeneous interface constructed of DG and Si 3 N 4 generate relaxation of interface polarization in gigahertz band, [50] thereby achieving tunable of the FD of the ε′. More fully, the relaxation of the interface polarization is demonstrated by theoretical calculations (Figure S6, Supporting Information).…”

Section: Resultssupporting

confidence: 59%

Defect‐Engineered Graphene/Si₃N₄Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

Liang

Cao

et al. 2022

Adv Funct Materials

112

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To tackle the increasing electromagnetic pollution, broadband electromagnetic wave (EMW) absorption materials are urgently needed. Toward this goal, traditional strategies resort to the construction of multicomponent dielectric/magnetic hybrid materials, including ternary, quaternary, or even more complicated systems. However, they always suffer from many intrinsic drawbacks in practical applications. Herein, a theory‐directed strategy is presented to design plainified EMW absorption materials (binary hybrids) via amplified interface effects, which are based on well‐designed multilayer alternating core‐shell nanostructures by chemical vapor deposition (CVD). A defect‐engineered CVD graphene (DG) core composed of graphitic open edges and in‐plane defects is used as a lossy phase. Correspondingly, a CVD Si3N4 layer with nanometer thickness is used as an impedance matching shell. By optimizing the alternating numbers of DG/Si3N4 units, enhanced interface polarization and strong frequency dispersion behavior of permittivity (especially the real part, ε′) are obtained, which helps the plainified binary hybrids to reach an effective absorption bandwidth (EAB) of 8.0 GHz at a thickness of 2.7 mm. Moreover, these plainified hybrids show excellent thermal and pH stability. Even after 1000 °C oxidation, for example, an EAB of 7.44 GHz coupling with a minimum reflection coefficient of −77.3 dB is still achieved.

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Section: Resultssupporting

confidence: 59%

Defect‐Engineered Graphene/Si₃N₄Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

Liang

Cao

et al. 2022

Adv Funct Materials

112

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“…[5] Moreover, the limited charge transfer and sulfur-site inertness further restrict the development of TMDs for EMW absorption. [6] Therefore, in addition to the modification of currently existing materials such as MoS 2 and WS 2 , [16,17] it is necessary to explore and develop 2D TMDs with high-density active sites and high conductivity to fill up the atlas of the dielectric properties of layered TMDs which appears to be particularly important to grasp their basic nature and design the next generation of EMW absorption materials. Furthermore, it is suggested that resistance matching, multi-reflection, and interface polarization could occur in microwave absorbers with multi-phase heterohybrid structures, leading to superior EMW absorption.…”

Section: Introductionmentioning

confidence: 99%

Initiating VB‐Group Laminated NbS₂ Electromagnetic Wave Absorber toward Superior Absorption Bandwidth as Large as 6.48 GHz through Phase Engineering Modulation

Zhang

Cheng

Wang

et al. 2021

Adv Funct Materials

Self Cite

204

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VB-Group transition metal disulfides (TMDs) are considered excellent materials for electromagnetic wave (EMW) absorption because of their good conductivity and abundant active sites located at their edges and substrates, as compared with VIB-Group TMDs. Herein, for the first time, EMW absorbers based on VB-Group NbS 2 nanosheets by using a facile one-step solvothermal method are successfully prepared. The minimum reflection loss (RL min ) can reach up to 43.85 dB with an effective absorption bandwidth of 6.48 GHz (11.52-18.00 GHz). The remarkable EMW absorption performance can also be reflected in the tunable frequency bands (C-, X-, and Ku-bands), which is achieved by adjusting the contents of materials. Further more, the influence of the content of 2H-phase and 1T-phase in NbS 2 on the EMW absorption performance is systematically investigated. The hierarchical hollow-sphere structure of NbS 2 promotes dielectric loss and the multiple reflection and absorption of EMW, and enhances the impedance matching and synergistic attenuation ability. This work demonstrates that the bottleneck of effective absorbing frequency band of single-component dielectric EMW absorbing materials could be broken through, and paves a novel path towards developing broadband absorbing materials in EMW absorption.

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“…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 ]. Third, polarization loss primarily originated from dipolar/interfacial polarization becomes the dominant factor in determining the dielectric behavior.…”

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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Conductive WS2-NS/CNTs hybrids based 3D ultra-thin mesh electromagnetic wave absorbers with excellent absorption performance

Cited by 145 publications

References 51 publications

Defect‐Engineered Graphene/Si₃N₄Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

Defect‐Engineered Graphene/Si₃N₄Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

Initiating VB‐Group Laminated NbS₂ Electromagnetic Wave Absorber toward Superior Absorption Bandwidth as Large as 6.48 GHz through Phase Engineering Modulation

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

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Conductive WS2-NS/CNTs hybrids based 3D ultra-thin mesh electromagnetic wave absorbers with excellent absorption performance

Cited by 145 publications

References 51 publications

Defect‐Engineered Graphene/Si3N4Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

Defect‐Engineered Graphene/Si3N4Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

Initiating VB‐Group Laminated NbS2 Electromagnetic Wave Absorber toward Superior Absorption Bandwidth as Large as 6.48 GHz through Phase Engineering Modulation

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

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Defect‐Engineered Graphene/Si₃N₄Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

Defect‐Engineered Graphene/Si₃N₄Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

Initiating VB‐Group Laminated NbS₂ Electromagnetic Wave Absorber toward Superior Absorption Bandwidth as Large as 6.48 GHz through Phase Engineering Modulation