Core-shell heterogeneous graphene-based aerogel microspheres for high-performance broadband microwave absorption via resonance loss and sequential attenuation

Zhi, Dandan; Li, Tian; Zheng, Qi; Li, Jinzhe; Tian, Yingrui; Deng, Wenting; Meng, Fanbin

doi:10.1016/j.cej.2022.134496

Cited by 120 publications

(39 citation statements)

References 43 publications

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“…In-depth analysis of the electric field, magnetic field, and surface current distributions of the absorber is crucial for further revealing the EMW absorption mechanism of CoAl/CoFe-CoC x @NC heterostructures. , Importantly, determining the EMW absorption site in the material is a strong guarantee for further improving the EMW absorption performance. Therefore, the frequency-dependent electric field, magnetic field, and surface current distributions are simulated by a computer simulation technology (CST) program (see details in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…Generally, matching properties can be evaluated by the surface current density. The smaller the surface current density, the more appropriate the matching performance is. , Therefore, the surface current distributions of CoAl/CoFe-CoC x @NC at 2, 10, and 18 GHz are presented in Figure . Apparently, nanoplates and nanosheets exhibit better matching properties than nanoparticles, which indicates the strong coupling effect of the CoAl-LDH “ligand” and nanosheet derived from the CoFe-PB “host”.…”

Section: Resultsmentioning

confidence: 99%

“…In-depth analysis of the electric field, magnetic field, and surface current distributions of the absorber is crucial for further revealing the EMW absorption mechanism of CoAl/ CoFe-CoC x @NC heterostructures. 51,52 Importantly, determining the EMW absorption site in the material is a strong guarantee for further improving the EMW absorption performance. Therefore, the frequency-dependent electric field, From the frequency-dependent electric field distributions of CoAl/CoFe-CoC x @NC heterostructures in Figure 8, it can be seen that the intensity of the electric field and electrical coupling decreases slightly with the increase of frequency (Figure 8a2−c2,a3−c3,a4−c4).…”

Section: Resultsmentioning

confidence: 99%

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Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Zeng

Nie

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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Constructing the strong interaction between the matrix and the active centers dominates the design of high-performance electromagnetic wave (EMW) absorption materials. However, the interaction-relevant absorption mechanism is still unclear, and the design of ultrahigh reflection loss (R L < −80 dB) absorbers remains a great challenge. Herein, CoFe-based Prussian blue (PB) nanocubes are coprecipitated on the surface of ultrathin CoAl-LDH nanoplates with the assistance of unsaturated coordination sites. During the subsequent pyrolysis process, CoAl-LDH serves as a “ligand” providing a Co source and reacts with Fe or C in the CoFe-PB “host” to form stable CoFe alloys or CoC x species. As a result, strong reactions emerged between the CoAl-LDH matrix and the active CoFe-CoC x @NC centers. Based on the experimental results, the CoAl/CoFe-CoC x @NC hierarchical heterostructure delivers good dielectric losses (dipolar polarization, interface polarization, and conductive loss), magnetic losses (eddy current loss, natural resonance, and exchange resonance), and impedance matching, resulting in a remarkable EMW absorption performance with a reflection loss (R L) value of −82.1 dB at a matching thickness of 3.8 mm. Theoretical results (commercial CST) identify that the strong interaction between the 2D CoAl-LDH “ligand” and 2D CoFe-CoC x “host” promotes a robust heterointerface among the nanoparticles, nanosheets, and nanoplates, which extremely contribute to the dielectric loss. Meanwhile, the coupling effect of nanosheets and nanoplates greatly contributes to the matching performance. This work provides an aggressive strategy for the effect of ligands and hosts on high-performance EMW absorption.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…In-depth analysis of the electric field, magnetic field, and surface current distributions of the absorber is crucial for further revealing the EMW absorption mechanism of CoAl/ CoFe-CoC x @NC heterostructures. 51,52 Importantly, determining the EMW absorption site in the material is a strong guarantee for further improving the EMW absorption performance. Therefore, the frequency-dependent electric field, From the frequency-dependent electric field distributions of CoAl/CoFe-CoC x @NC heterostructures in Figure 8, it can be seen that the intensity of the electric field and electrical coupling decreases slightly with the increase of frequency (Figure 8a2−c2,a3−c3,a4−c4).…”

Section: Resultsmentioning

confidence: 99%

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Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Zeng

Nie

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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“…The dielectric loss of composites was mainly caused by conductive loss and polarization relaxation. 40,41 The absorption mechanism is mainly attributed to the intrinsic dielectric attenuation of RGO-SiN and multiscattering of 3D wrinkled structure containing ridge walls. First, high-conductivity graphene generally has a higher dielectric constant, accomplished with stronger conductivity loss.…”

Section: Resultsmentioning

confidence: 99%

Bionic Scarfskin-Inspired Hierarchy Configuration toward Tunable Microwave-Absorbing Performance

Yang

Tan

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Maintaining the dynamical microwave synchronization between a target and its background is the key to electromagnetical invisibility in real environment. Herein, we introduce an archetypical paradigm for ultraelastic films of graphene-functionalized ionic gel with tunable microwave-absorbing behaviors. Inspired by the local structural changes during the wing-spreading process of vespertilionids, the experimental and finite element simulations have revealed that proper shape changing of 3D wrinkled structure containing ridge walls with moderate impedance is the effective way to minimize reflected wave and promote energy attenuation. An optimal RL value of −43.6 dB and valid regulatory amplitude of 41.5 dB, covering a microwaveabsorbing to shielding state, could be reached with only 0.2% weight fraction of the active ingredient RGO filler. The significant regulatory performance is attributed to the competitive effect between intrinsic dielectric attenuation of silicon nitride modified reduced graphene oxide (RGO-SiN), multiscattering of a 3D wrinkled structure, and evolution of the oriented RGO-SiN.

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“…Bulk solid materials with macrostructures, such as foams 12,13 and aerogels, 14,15 which can be applied as a free-standing EMW absorbing and EMI shielding materials, are seen as a potential strategy for the development of new-type lightweight absorbers with versatility by addressing the poor durability of composites without subsequent steps and improving the poor cohesion of conventional composites. 16 So far, graphene-based aerogel as a representative of lightweight multifunctional EMW absorbing and EMI shielding materials with three-dimensional (3D) porous structure has achieved high intensity broadband absorption, which has been applied in complex environments because of its excellent high hydrophobicity, heat insulation, anti-frosting, and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Marine polysaccharide-based electromagnetic absorbing/shielding materials: design principles, structure, and properties

Wang

Xiao

et al. 2022

J. Mater. Chem. A

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Core-shell heterogeneous graphene-based aerogel microspheres for high-performance broadband microwave absorption via resonance loss and sequential attenuation

Cited by 120 publications

References 43 publications

Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Bionic Scarfskin-Inspired Hierarchy Configuration toward Tunable Microwave-Absorbing Performance

Marine polysaccharide-based electromagnetic absorbing/shielding materials: design principles, structure, and properties

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