Tunable and high performance electromagnetic absorber based on ultralight 3D graphene foams with aligned structure

Yuan-wu, Chen; Zhang, Haiyan; Zeng, Guoxun

doi:10.1016/j.carbon.2018.09.014

Cited by 32 publications

(8 citation statements)

References 42 publications

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“…Besides, high-frequency exchange resonance can't occur under the larger nanoparticle sizes. The eddy current effect is often described on the basis of the following formula [55][56][57][58] 𝐶 0 = 𝜇 ″ (𝜇 ′ ) −2 𝑓 −1 = 2𝜋𝜇 0 𝜎𝑑 2 /3 (3) If eddy current effect is the only pathway for magnetic loss, C 0 curve will become frequency-independent. As plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…5c). [58] On the other hand, thanks to the foldable structure, the destructive interference would take place in the electric field component and magnetic field to attenuate microwave energy. Based on the above analysis about the loss mechanisms, it can be concluded that foldable structure has played a decisive role on the tunable and high efficient EM absorption.…”

Section: Resultsmentioning

confidence: 99%

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Poly(Vinylidene Fluoride)/Cu@Ni Anchored Reduced-graphene Oxide Composite Films with Folding Movement to Boost Microwave Absorption Properties

Zhao¹,

Liang²,

Bai³

et al. 2021

ES Energy Environ.

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The influence of reduced graphene oxide (rGO)/Cu@Ni loading and foldable structure on the microwave absorption properties of poly(vinylidene fluoride) (PVDF)/rGO/Cu@Ni composite films was investigated in detail. The microwave absorption properties of the PVDF/rGO/Cu@Ni composite films increased with the rGO/Cu@Ni content increases and then decreased, which was due to the variation of impedance match. Additionally, the foldable structure was found to play a decisive role on the tunable and strong microwave absorption. The minimal reflection loss of -49.1 dB could be obtained for foldable PVDF/20 wt% rGO/Cu@Ni with a thickness of 2.5 mm, and the bandwidth (below -20 dB, 99% dissipation) could reach 6.4 GHz .

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Poly(Vinylidene Fluoride)/Cu@Ni Anchored Reduced-graphene Oxide Composite Films with Folding Movement to Boost Microwave Absorption Properties

Zhao¹,

Liang²,

Bai³

et al. 2021

ES Energy Environ.

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“…A huge difference is shown in EMI SE when incident EMWs propagate along the perpendicular direction or parallel direction of aligned pore channels. Multiple reflections of the incident EMWs to the channel walls will be enhanced if the EMWs propagate perpendicular to the aligned pore channels [25,88]. Meanwhile, the anisotropic pore structures afford [89][90][91] stronger compressive properties in the specific direction [92][93][94][95].…”

Section: Porous Architectures With Biomimetic Ordered Pores For High-...mentioning

confidence: 99%

“…Recently, thanks to the high conductivity, low mass density, and decent flexibility, great efforts have been invested in the polymeric shielding composites embedded with functional nanomaterials such as carbon nanotubes (CNTs) [12,13], reduced graphene oxide (rGO) [14,15], transition metal carbides and/or nitrides (MXenes) [16][17][18][19][20], and silver nanowires (AgNWs) [21,22]. Particularly, the introduction of the porous structure to generate abundant interior surfaces/interfaces in the shielding composites is an efficient strategy to improve the multiple reflections of incident electromagnetic waves (EMWs), further enhancing the EMI shielding performance [23][24][25][26][27][28]. As a class of porous engineering materials, hydrogels, composed of a network of cross-linked hydrophilic building blocks surrounded by water, not only maintain the porous structure but also possess a water-enriched interior environment [29,30].…”

Section: Introductionmentioning

confidence: 99%

Hydrogel-based composites beyond the porous architectures for electromagnetic interference shielding

et al. 2022

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With the rapid development of the electronic industry and wireless communication technology, electromagnetic interference (EMI) or pollution has been increasingly serious. This not only severely endangers the normal operation of electronic equipment but also threatens human health. Therefore, it is urgent to develop high-performance EMI shielding materials. The advent of hydrogel-based materials has given EMI shields a novel option. Hydrogels combined with conductive functional materials have good mechanical flexibility, fatigue durability, and even high stretchability, which are beneficial for a wide range of applications, especially in EMI shielding and some flexible functional devices. Herein, the current progress of hydrogel-based EMI shields was reviewed, in the meanwhile, some novel studies about pore structure design that we believe will help advance the development of hydrogel-based EMI shielding materials were also included. In the outlook, we suggested some promising development directions for the hydrogel-based EMI shields, by which we hope to provide a reference for designing hydrogels with excellent EMI shielding performance and multifunctionalities.

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“…Therefore, tailoring the microstructure, especially porosity design, is considered as the most promising method to tackle it. [22,23] Introducing the pores into hybrids not only enhances the impedance matching and leads to the interfacial polarization, but meets the demand of lightweight absorbing materials. Delightedly, the newly emerged TCNFs preserve the structure and properties of CNTs, and exhibit the merits of low-cost formation due to the direct calcination of TPNFs.…”

Section: Introductionmentioning

confidence: 99%

High‐Efficiency Microwave Attenuation of Magnetic Carbon Nanoparticle‐Decorated Tubular Carbon Nanofibers Composites at an Ultralow Filling Content

Kang

Qiao

Cao

et al. 2021

Adv Elect Materials

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Faced with the formidable challenge to achieve a powerful absorption and broad bandwidth under a thin response thickness at a low filler content, tailoring the composition and microstructure of the absorbers is generally regarded as a potential method to tackle it. In the study, unprecedented tubular carbon nanofiber/Co/nanoporous carbon (TCNFs/Co/NPC) hybrids with rich holes are obtained by the direct thermal treatment of tubular polymer nanofibers/ZIF-67 (TPNFs/ZIF-67) precursor, which is fabricated by controllable anchor of ZIF-67 nanocrystals on the surface of sulfonated TPNFs (TPNFs-SO 3 H). The dielectric parameters of the resultant samples are reasonably monitored by adjustable TPNFs-SO 3 H dosage and filling content. Benefiting from the dielectric-magnetic compositions and unique heterogeneous and porous configurations, the boosted impedance matching and polarization relaxation are given. Hence, under an ultralow filling content of 8 wt%, a minimum reflection loss (RL min ) value of −54.1 dB corresponding to a matching thickness of 2 mm and an effective absorption bandwidth (EAB) of 6.2 GHz at 2.5 mm are exhibited at the TPNFs-SO 3 H usage of 100 mg and carbonization temperature of 700 °C, respectively. This work provides an instructive guidance for constructing highly efficient absorbers with strong attenuation and wide frequency range at a low thickness.

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Tunable and high performance electromagnetic absorber based on ultralight 3D graphene foams with aligned structure

Cited by 32 publications

References 42 publications

Poly(Vinylidene Fluoride)/Cu@Ni Anchored Reduced-graphene Oxide Composite Films with Folding Movement to Boost Microwave Absorption Properties

Poly(Vinylidene Fluoride)/Cu@Ni Anchored Reduced-graphene Oxide Composite Films with Folding Movement to Boost Microwave Absorption Properties

Hydrogel-based composites beyond the porous architectures for electromagnetic interference shielding

High‐Efficiency Microwave Attenuation of Magnetic Carbon Nanoparticle‐Decorated Tubular Carbon Nanofibers Composites at an Ultralow Filling Content

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