On the absorption dominated EMI shielding effects in free standing and flexible films of poly(vinylidene fluoride)/graphene nanocomposite

Sabira, K.; Jayakrishnan, Methapettyparambu Purushothama; Saheeda, P.; Jayalekshmi, S.

doi:10.1016/j.eurpolymj.2017.12.034

Cited by 60 publications

(35 citation statements)

References 40 publications

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“…As shown in Fig. 4a, a comparison was made between AgNF with a density of 0.2 g cm −3 and other EMI shielding materials, including CNT, 19,52,53 rGO, 20,54 graphene, 21,[55][56][57][58] stainless steel fiber, 7 silver NW, 16 copper NW, 17 nickel hybrid fiber, 7,59 carbon fiber, 7 and some ceramic materials. [59][60][61] Moreover, the specific EMI SE of AgNF is orders of magnitude higher than that of graphene, 22,62 copper, 63 stainless steel, 63 nickel fiber, 63 carbon fiber, 63 and CNT.…”

Section: Resultsmentioning

confidence: 99%

Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding

et al. 2019

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A kind of pollution known as electromagnetic interference (EMI), which results from ubiquitous usage of various electronic communication and military radar equipment, has been receiving increasing attention recently. However, large-area EMI shielding on transparent and/or curved surfaces, including building windows, curved glass wall, and special requirements spaces (SRSs), remains hard to achieve. In this paper, a silver nanofiber (AgNF) based flexible and transparent EMI shielding film was successfully assembled via a room-temperature roll-to-roll production method. For transparent application scenario, AgNF with 89% transmittance in visible range and 1 μm thickness shows~20 dB shielding efficiency (EMI SE). On the other hand, total shielding (>50 dB) is obtained when the thickness of AgNF increases to 10 μm, while its transmittance in visible range remains higher than 75%. Considering the facile and scale-free production technology, this material can be readily applied in large-scale, transparent, and/or SRSs EMI shielding.

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Section: Resultsmentioning

confidence: 99%

Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding

et al. 2019

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“…With the unprecedented development of mobile phones, notebook computers, wireless routers, and other electronic devices, electromagnetic interference (EMI) shielding has become a form of silent pollution, which seriously affects the normal operation of other electronic circuits nearby and even endangers human life [1,2,3,4,5,6]. An effective method to solve the thorny problem is using EMI shielding materials to eliminate these unwanted electromagnetic energies.…”

Section: Introductionmentioning

confidence: 99%

“…For decades, researchers have made considerable efforts towards designing and fabricating various shielding materials by adjusting the dielectric constant and magnetic permeability in the pursuit of low interfacial impedance, as well as high loss ratio of incident microwave [2,17,18]. It has been reported that the combination of conductive fillers and magnetic nanoparticles can obviously improve the contribution of EM wave absorption to total shielding effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Layer-Structured Design and Fabrication of Cyanate Ester Nanocomposites for Excellent Electromagnetic Shielding with Absorption-Dominated Characteristic

Ren

Guo

et al. 2018

Polymers

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In this work, we propose novel layer-structured polymer composites (PCs) for manipulating the electromagnetic (EM) wave transport, which holds unique electromagnetic interference (EMI) shielding features. The as-prepared PCs with a multilayered structure exhibits significant improvement in overall EMI shielding effectiveness (EMI SE) by adjusting the contents and distribution of electrical and magnetic loss fillers. The layer-structured PCs with low nanofiller content (5 wt % graphene nanosheets (GNSs) and 15 wt % Fe3O4) and a thickness of only 2 mm exhibited ultrahigh electrical conductivity and excellent EMI SE, reaching up to 2000 S/m and 45.7 dB in the X-band, respectively. The increased EMI SE of the layer-structured PCs was mainly based on the improved absorption rather than the reflection of electromagnetic waves, which was attributed to the “absorb-reflect-reabsorb” process for the incident electromagnetic waves. This work may provide a simple and effective approach to achieve new EMI shielding materials, especially for absorption-dominated EMI shielding.

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“…[1][2][3] Among several thermoplastics, poly(vinylidene fluoride) (PVDF) has been widely employed as matrix for developing carbon-based CPCs due to its unique electrical properties associated with good flexibility, processability, and outstanding thermal and chemical resistance. [4][5][6][7][8][9] Several works in the literature report the EMI shielding effectiveness and absorbing properties of PVDF-based composites loaded with carbon nanotube (CNT), [10][11][12] graphite and their derivatives (expanded graphite, graphene nanoplatelets; reduced graphene oxide). [4][5][6]8,13] The combination of different conducting fillers has been also considered a good strategy for improving the electric conductivity and also EMI shielding effectiveness (EMI SE) of CPCs.…”

mentioning

confidence: 99%

“…[4][5][6][7][8][9] Several works in the literature report the EMI shielding effectiveness and absorbing properties of PVDF-based composites loaded with carbon nanotube (CNT), [10][11][12] graphite and their derivatives (expanded graphite, graphene nanoplatelets; reduced graphene oxide). [4][5][6]8,13] The combination of different conducting fillers has been also considered a good strategy for improving the electric conductivity and also EMI shielding effectiveness (EMI SE) of CPCs. This approach was well documented for hybrids involving CNT/graphite or derivatives, [14][15][16][17][18] and CNT/carbon black (CB).…”

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confidence: 99%

Hybrid carbonaceous materials for radar absorbing poly(vinylidene fluoride) composites with multilayered structures

et al. 2021

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Poly(vinylidene fluoride) (PVDF) based composites loaded with 3 wt% of carbon black (CB), graphite (GF), and the hybrid CB/GF (1.5/1.5 wt%) were prepared by melt mixing and tested as microwave absorbing material at X-band frequencies (8-12 GHz). The materials were processed and pressed at 220 C into plates of 20 × 20 × 0.1 cm 3. Dielectric and magnetic properties were evaluated using the wave-guide accessory to simulate the reflectivity of singlelayered PVDF composites through impedance matching behavior. The best absorbing properties were achieved with the composite loaded with the CB/GF hybrid material, whose maximum of radiation attenuation of −33 dB at 9.3 GHz was predicted with 4 mm thickness. Afterwards, the reflectivity of sandwiched structures (20 × 20 cm 2 in size) with one-layer honeycomb core sandwiched by two plates of PVDF composites was measured. The PVDF/HBhoneycomb-PVDF/HB structure reached reflection loss = −12 dB (E a = 94%) on a broadband frequency. CB/GF hybrid material in PVDF composites has a promising future as a lightweight and cost-effective microwave absorbing materials for both telecommunication and stealth technology.

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On the absorption dominated EMI shielding effects in free standing and flexible films of poly(vinylidene fluoride)/graphene nanocomposite

Cited by 60 publications

References 40 publications

Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding

Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding

Layer-Structured Design and Fabrication of Cyanate Ester Nanocomposites for Excellent Electromagnetic Shielding with Absorption-Dominated Characteristic

Hybrid carbonaceous materials for radar absorbing poly(vinylidene fluoride) composites with multilayered structures

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