Achieving wideband microwave absorption properties in PVDF nanocomposite foams with an ultra-low MWCNT content by introducing a microcellular structure

Zhao, Biao; Deng, Jiushuai; Zhao, Changzhi; Wang, Chongda; Chen, Yu Guang; Hamidinejad, Mahdi; Li, Ruosong; Park, Chul

doi:10.1039/c9tc04575a

Cited by 120 publications

(59 citation statements)

References 92 publications

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“…Complex permittivity (ε r = ε′ − jε″) and complex permeability (μ r = μ′ − jμ″) are the two factors key to the investigation of the microwave dissipation mechanism. [ 58 ] The real units of the EM parameters ( ε′ , µ′ ) stand for the storage capability of electrical and magnetic energy, respectively, whereas the imaginary units ( ε″ , µ″ ) symbolize the dissipation ability of EM energy. [ 59 ] As shown in Figure 5a,c,e, for complex permittivity, the real parts ( ε′ ) and imaginary parts ( ε″ ) of oriented samples were decreased compared with those of random counterparts.…”

Section: Resultsmentioning

confidence: 99%

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

Zhao

Zeng

et al. 2020

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Electromagnetic (EM) wave absorption materials have attracted considerable attention because of EM wave pollution caused by the proliferation of electronic communication devices. One‐dimentional (1D) structural magnetic metals have potential as EM absorption materials. However, fabricating 1D core–shell bimetallic magnetic species is a significant challenge. Herein, 1D core–shell bimetallic magnetic chains are successfully prepared through a modified galvanic replacement reaction under an external magnetic field, which could facilitate the preparation of 1D core–shell noble magnetic chains. By delicately designing the orientation of bimetallic magnetic chains in polyvinylidene fluoride, the composites reveal the decreased complex permittivity and increased permeability compared with random counterparts. Thus, elevated EM wave absorption perfromances including an optimal reflection loss of −43.5 dB and an effective bandwidth of 7.3 GHz could be achieved for the oriented Cu@Co sample. Off‐axis electron holograms indicate that the augmented magnetic coupling and remarkable polarization loss primarily contribute to EM absorption in addition to the antenna effect of the 1D structure to scatter microwaves and ohmic loss of the metallic attribute. This work can serve a guide to construct 1D core–shell bimetallic magnetic nanostructures and design magnetic configuration in polymer to tune EM parameters and strengthen EM absorption properties.

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Section: Resultsmentioning

confidence: 99%

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

Zhao

Zeng

et al. 2020

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341

133

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“…At the same time, the 3D structure greatly increases the propagation path of EM waves, causing the incident EM waves to be attenuated through zigzag reection and scattering. 44,45 Second, the residual OH À , F À and O 2À functional groups and localized defects in Ti 3 C 2 T X nanosheets act as polarized centers. 46,47 Third, there is a large amount of electron migration at the defects and interfaces between Ti 3 C 2 T X nanosheets and CF skeleton in the alternated EM environment, thereby forming a rich eld-induced microcurrent.…”

Section: Resultsmentioning

confidence: 99%

A new flexible and ultralight carbon foam/Ti₃C₂T_X MXene hybrid for high-performance electromagnetic wave absorption

et al. 2019

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A new ultralight carbon foam/Ti 3 C 2 T X (CF/MXene) electromagnetic (EM) absorbing hybrid with threedimensional network structure was fabricated by vacuum impregnation and freeze-drying process.These hybrids display excellent flexibility and steady compression-resilience properties and also the special three-dimensional structure with ultralow density of only 5-7 mg cm À3 shows higher EM absorption than most foam-based EM absorbers. Studies have shown that the minimum reflection loss of CF/MXene-N2 reaches À45 dB at 8.8 GHz with the Ti 3 C 2 T X nanosheets content of 9.8%. In the meanwhile, the effective absorption bandwidth of CF/MXene-N2 can also reach up to 5 GHz (from 6.9GHz to 11.9 GHz) with the thickness of 4.5 mm. Moreover, the fundamental EM absorption mechanism of CF/MXene hybrids involved to impedance matching, conductive loss and polarization loss is carefully analyzed. Thus, it is expected that the new ultralight carbon foam/Ti 3 C 2 T X hybrids with threedimensional network structure will have great application prospects in the fields of EM absorption. Fig. 9 Three typical states of Ti 3 C 2 T X nanosheets in the hybrids; (a) Ti 3 C 2 T X MXenes cover the CF micropores, (b) Ti 3 C 2 T X MXenes hang on the CF skeleton, (c) Ti 3 C 2 T X MXenes attach to the surface of the CF skeleton.41044 | RSC Adv., 2019,9,[41038][41039][41040][41041][41042][41043][41044][41045][41046][41047][41048][41049] This journal is

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“…CPCs have been used in a variety of applications, such as flexible supercapacitors, [ 4 ] temperature sensors, [ 5 ] magnetoresistance devices, [ 6 ] and energy storage. [ 7 ] Furthermore, the inherent properties of CPCs make them attractive as a potential alternative to metals in the electronics industry for electromagnetic shielding [ 8–10 ] and sensors. [ 11 ] Carbon‐based materials are lightweight and exhibit excellent mechanical properties and thermal stability, and have broad applications as fillers, including in electrodes for supercapacitors [ 12,13 ] and batteries [ 14,15 ] and environmental protection.…”

Section: Introductionmentioning

confidence: 99%

Microcellular Conductive Carbon Black or Graphene/PVDF Composite Foam with 3D Conductive Channel: A Promising Lightweight, Heat‐Insulating, and EMI‐Shielding Material

Jia

Phule

Geng

et al. 2021

Macro Materials & Eng

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In this study, a lightweight microcellular carbon‐based filler/poly(vinylidene fluoride) (PVDF) composite foam is fabricated with a 3D conductive network that is thermally insulating, electrically conductive, and fabricated on a large scale. This composite can be used for high‐efficiency thermal insulation and electromagnetic interference (EMI) shielding applications. The prepared composite demonstrates low density, high electrical conductivity, and excellent thermal insulation properties. The structure and density of the conductive network and the carbon‐based filler content has a significant influence on the electrical conductivity of the prepared composite foam. Although the composite comprises microcellular PVDF beads of the same density, the conductivity of the composite‐comprising strip beads is greater than that comprising spherical beads. In the same conductive network structure, as the size of the microcellular PVDF beads decrease, the conductive network becomes denser, which results in a higher conductivity. Furthermore, with an increase in the conductive filler content, the conductivity improves significantly. Excellent EMI shielding materials with optimal filler content and particle shapes, exhibiting EMI shielding effectiveness of up to 40–50 dB, are developed. The prepared composite foam possesses excellent application potential in the fields of ultra‐light thermal insulation, conductivity, and EMI shielding.

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Achieving wideband microwave absorption properties in PVDF nanocomposite foams with an ultra-low MWCNT content by introducing a microcellular structure

Abstract: PVDF nanocomposite foams with ultra-low MWCNT content exhibit high-efficiency microwave absorption properties with a light weight, strong and wide-band absorption, and small-thickness properties.

Cited by 120 publications

References 92 publications

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

A new flexible and ultralight carbon foam/Ti₃C₂T_X MXene hybrid for high-performance electromagnetic wave absorption

Microcellular Conductive Carbon Black or Graphene/PVDF Composite Foam with 3D Conductive Channel: A Promising Lightweight, Heat‐Insulating, and EMI‐Shielding Material

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Achieving wideband microwave absorption properties in PVDF nanocomposite foams with an ultra-low MWCNT content by introducing a microcellular structure

Abstract: PVDF nanocomposite foams with ultra-low MWCNT content exhibit high-efficiency microwave absorption properties with a light weight, strong and wide-band absorption, and small-thickness properties.

Cited by 120 publications

References 92 publications

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

A new flexible and ultralight carbon foam/Ti3C2TX MXene hybrid for high-performance electromagnetic wave absorption

Microcellular Conductive Carbon Black or Graphene/PVDF Composite Foam with 3D Conductive Channel: A Promising Lightweight, Heat‐Insulating, and EMI‐Shielding Material

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A new flexible and ultralight carbon foam/Ti₃C₂T_X MXene hybrid for high-performance electromagnetic wave absorption