Overview of carbon nanostructures and nanocomposites for electromagnetic wave shielding

Wang, Chao; Murugadoss, Vignesh; Kong, Jie; He, Zhenfeng; Mai, Xianmin; Shao, Qian; Chen, Yanjun; Guo, Li; Liu, Chuntai; Angaiah, Subramania; Guo, Zhanhu

doi:10.1016/j.carbon.2018.09.006

Cited by 618 publications

(254 citation statements)

References 247 publications

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“…The EM parameters include relative complex permeability(μ = µ‫׳‬ − jµ‫)׳׳‬ and permittivity (ε = ε‫׳‬ − jε‫. )׳׳‬ The real parts of these EM parameters (ε‫׳‬ and µ‫)׳‬ indicates the electric and magnetic storage ability, while the imaginary parts ‫׳׳‪(ε‬‬ and ‫)׳׳‪µ‬‬ are related to the dielectric and magnetic energy dissipation, respectively [20]. An ideal absorptive material is required to possess good impedance matching characteristics, which demands that the material possess optimized EM parameters.…”

Section: Em Wave Absorption Propertiesmentioning

confidence: 99%

“…Generally, RL value of −10 dB or −20 dB correspond to 90% or 99% EM wave absorption, respectively [36]. The range of frequency equivalent to this reflection loss (RL < −10 dB) in a single absorber thickness can be regarded as the effective absorption bandwidth (EAB) [20]. The variation of the RL curves of all samples at layer thicknesses in the range 2.0-5.5 mm from 8.2-18 GHz is presented in Figure 10.…”

Section: Em Wave Absorption Propertiesmentioning

confidence: 99%

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Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

et al. 2019

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Magnetite (Fe 3 O 4 ) have been thoroughly investigated as microwave absorbing material due to its excellent electromagnetic properties (permittivity and permeability) and favorable saturation magnetization. However, large density and impedance mismatch are some of the limiting factors that hinder its microwave absorption performance (MAP). Herein, Fe 3 O 4 nanoparticles prepared by facile co-precipitation method have been coated with citric acid and embedded in a polyvinylidene fluoride (PVDF) matrix. The coated Fe 3 O 4 nanoparticles were characterized by X-ray diffraction spectrometer (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and vibrating sample magnetometer (VSM). COMSOL Multiphysics based on the finite element method was used to simulate the rectangular waveguide at X-band and Ku-band frequency range in three-dimensional geometry. The citric acid coated Fe 3 O 4 /PVDF composite with 40 wt.% filler loading displayed good microwave absorption ability over the studied frequency range (8.2-18 GHz). A minimum reflection loss of −47.3 dB occurs at 17.9 GHz with 2.5 mm absorber thickness. The composite of citric acid coated Fe 3 O 4 and PVDF was thus verified as a potential absorptive material with improved MAP. These enhanced absorption coefficients can be ascribed to favorable impedance match and moderate attenuation. Appl. Sci. 2019, 9, 3877 2 of 17 attracted much interest in the field of EM wave absorption. However, Fe 3 O 4 as an absorptive material have some limitations such as the rapid decrease in permeability value at microwave frequency, large density, ease of oxidation and mismatch of impedance which impedes its performance as an ideal MAM [6,7].Recently, several research efforts have been geared towards improving the microwave absorption performance (MAP) of Fe 3 O 4 . For example, Mingxu et al. [8] fabricated hollow Fe 3 O 4 nanoparticles via solvothermal route, with the aim of reducing its density while retaining good magnetic properties for efficient MAP. They established improved EM wave absorption with increasing particle size and change in morphology. Maximum EM absorption with RL value of −55.14 dB at 11.76 GHz was achieved with an absorber thickness of 2.07 mm. Guiquig et al. [9] synthesized nano-Fe 3 O 4 by an innovative wet chemical route, employing hydrazine hydrate as anti-oxidation agent. The synthesized Fe 3 O 4 nanoparticle of average diameter of 77 nm possessed high magnetization saturation and coercivity value of 72.36 emu/g and 95 Oe, respectively. The minimum RL value of −21.2 dB was achieved with 6 mm thickness. Similarly, optimization of the MAP of Fe 3 O 4 via design and fabrication of hierarchical nanostructure have also been explored. Chaomie et al. [10] exploit one-step and template-free synthesis method to prepare octahedral Fe 3 O 4 nanostructure by direct decomposition of an iron organic compound with molten salt. The sample annealed at 800 • C displayed maximum EM absorption of −23.67 dB at 15.24 GHz at a ...

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Section: Em Wave Absorption Propertiesmentioning

confidence: 99%

Section: Em Wave Absorption Propertiesmentioning

confidence: 99%

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

et al. 2019

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“…Nowadays, polymer composite materials are broadly employed as a part of building applications, corrosion and erosion, EMI shielding, energy storage, fuel cells, and sensors because of their incredible physical and mechanical properties. These composites have applications in fields where high imperviousness to wear, scraped spot, and disintegration is required (mining, vehicle, residential gear, aviation, marine, sports, and so on) .…”

Section: Theoretical and Experimental Densities With Void Fractionsmentioning

confidence: 99%

Physico‐Mechanical and Antibacterial Properties of Pine Gum/Epoxy Composites with/without Silver Nanoparticles

Negi

Bisht

Singh

et al. 2019

Macro Materials & Eng

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Silver nanoparticles/polymer composite (Ag‐NPs/PC) may eventually be biodegradable, sustainable, or burned without production of lethal by‐products and can be utilized as packaging and biomedical device applications. Nanoparticles engaged in pine gum (resin and rosin) are preserved for months without any significant effect on particle size and distribution. This paper focuses on the pine gum/epoxy composites with and without silver nanoparticles fabricated by a hand lay‐up technique. Silver nanoparticles are fixed at 0.37% and pine gum varies from 2 to 24% by weight to acquire the best mechanical and wear properties. The result indicates that Ag‐NPs with pine gum (23.7 wt% resin &13.3 wt% rosin) has the best tensile and impact strength reaching a gain of 51.34% and 53.68% simultaneously. Hardness is noted most extreme 17.92% at Ag‐NPs sample (7.4 wt% resin and 3.7 wt% rosin) and wear resist behavior is best noted with neat pine gum/epoxy composite. The antibacterial assay of the Ag‐NPs is done against Escherichia coli and noted that the zone of inhibition is found to be 1.6 cm as compared to inhibition of 0.4 cm for pine gum reaching an advance of 75%. The various arrangements are enhanced and sited on the basis of TOPSIS technique.

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“…Currently, most researchers still focus on enhancing the TC value of thermal management materials and ignore this. Carbon‐based fillers such as graphene, graphite, and carbon nanotubes (CNTs) are fittingly applied to prepare EMI shielding thermal management materials owing to their high TC value and extraordinary electrical conductivity . The superior EMI shielding performance and high TC value could be achieved through establishing continuous electrical and thermal conductive network simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Dual‐direction high thermal conductivity polymer composites with outstanding electrical insulation and electromagnetic shielding performance

et al. 2020

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The rapid dissipation of accumulated heat and efficient electromagnetic interference (EMI) shielding attract considerable attention due to the gradual integration and miniaturization of electronic devices. In an attempt to simultaneously overcome these issues, dual‐direction high thermal conductivity (TC) materials with outstanding electrical insulation and EMI shielding performance are urgently demanded. Herein, a tailor‐made sandwich network structure with insulated outer layer and EMI shielding middle layer is constructed by compression molding. The sandwich network structure endows the composite (#AB0.7/AM0.7/AB0.7) with high TC values of 3.051 and 3.365 Wm−1 K−1 at through‐plane and in‐plane directions, respectively, excellent electrical insulation (6.61 × 1013 Ω cm, 3.25 kV/mm) and superior EMI shielding performance (>27.68 dB from 8.2 to 12.4 GHz). All these results demonstrate that the prepared composite with tailor‐made sandwich network structure is a promising candidate as ideal thermal management material for electronic devices.

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Overview of carbon nanostructures and nanocomposites for electromagnetic wave shielding

Cited by 618 publications

References 247 publications

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

Physico‐Mechanical and Antibacterial Properties of Pine Gum/Epoxy Composites with/without Silver Nanoparticles

Dual‐direction high thermal conductivity polymer composites with outstanding electrical insulation and electromagnetic shielding performance

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