Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

Kumar, Anil; Singh, Awantika; Kumari, Saroj; Dutta, Pradip Kumar; Dhawan, S. K.; Dhar, Ajay

doi:10.1039/c4ta01655f

Cited by 40 publications

(15 citation statements)

References 47 publications

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“…From 16.7 GHz, the ε″ of the CuNW aerogels starts to increase while the ε′ decreases, leading to a sharp rise of the dielectric loss tangent. Similar situations have also been observed in the Cu nanoparticle‐based materials . So we guess that copper material is sensitive to the EM wave with frequency above 16.7 GHz, where more electric energy can be dissipated, not stored in the material, producing fall in ε′ and rise in ε″ .…”

Section: Resultssupporting

confidence: 68%

Robust and Stable Cu Nanowire@Graphene Core–Shell Aerogels for Ultraeffective Electromagnetic Interference Shielding

Zou

et al. 2018

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Cu nanowires (CuNWs) are considered as a promising candidate to develop high performance metal aerogels, yet the construction of robust and stable 3D porous structures remains challenging which severely limits their practical applications. Here, graphene-hybridized CuNW (CuNW@G) core-shell aerogels are fabricated by introducing a conformal polymeric coating and in situ transforming it into multilayered graphene seamlessly wrapped around individual CuNWs through a mild thermal annealing process. The existence of the outer graphene shell reinforces the 3D bulk structure and significantly slows down the oxidation process of CuNWs, resulting in improved mechanical property and highly stable electrical conductivity. When applied in electromagnetic interference shielding, the CuNW@G core-shell aerogels exhibit an average effectiveness of ≈52.5 dB over a wide range (from 8.2 to 18 GHz) with negligible degradation under ambient conditions for 40 d. Mechanism analysis reveals that the graphene shell with functional groups enables dual reflections on the core-shell and a multiple dielectric relaxation process, leading to enhanced dielectric loss and energy dissipation within the core-shell aerogels. The flexible core-shell-structured CuNW@G aerogels, with superior mechanical robustness and electrical stability, have potential applications in many areas such as advanced energy devices and functional composites.

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Section: Resultssupporting

confidence: 68%

Robust and Stable Cu Nanowire@Graphene Core–Shell Aerogels for Ultraeffective Electromagnetic Interference Shielding

Zou

et al. 2018

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“…The shielding effectiveness (SE) of Ag@C sponge increases with the annealing temperature at a fixed thickness regardless of the decreased density (Table ), and the EMI SE values are stable in the whole measured frequency range (8.2–18 GHz), which is different from the reported shielding materials that have fluctuated SE values with frequency. [5b,24] The average EMI SE of Ag@C‐1000 with a thickness of only ≈1 mm is measured to be 37.9 dB in the frequency range of 8.2–12.5 GHz. For any shielding material, thickness plays a crucial role in determining its shielding performance, and the EMI SE can be improved simply by increasing the thickness.…”

Section: Resultsmentioning

confidence: 99%

Anticorrosive, Ultralight, and Flexible Carbon‐Wrapped Metallic Nanowire Hybrid Sponges for Highly Efficient Electromagnetic Interference Shielding

Wan

Zhu

et al. 2018

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Metal-based materials with exceptional intrinsic conductivity own excellent electromagnetic interference (EMI) shielding performance. However, high density, corrosion susceptibility, and poor flexibility of the metal severely restrict their further applications in the areas of aircraft/aerospace, portable and wearable smart electronics. Herein, a lightweight, flexible, and anticorrosive silver nanowire wrapped carbon hybrid sponge (Ag@C) is fabricated and employed as ultrahigh efficiency EMI shielding material. The interconnected Ag@C hybrid sponges provide an effective way for electron transport, leading to a remarkable conductivity of 363.1 S m and superb EMI shielding effectiveness of around 70.1 dB in the frequency range of 8.2-18 GHz, while the density is as low as 0.00382 g cm , which are among the best performances for electrically conductive sponges/aerogels/foams by far. More importantly, the Ag@C sponge surprisingly exhibits super-hydrophobicity and strong corrosion resistance. In addition, the hybrid sponges possess excellent mechanical resilience even with a large strain (90% reversible compressibility) and an outstanding cycling stability, which is far better than the bare metallic aerogels, such as silver nanowire aerogels and copper nanowire foams. This strategy provides a facile methodology to fabricate lightweight, flexible, and anticorrosive metal-based sponge for highly efficient EMI shielding applications.

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“…Electrically conducting polymers represent an important class of materials with potential applications in a number of devices such as electrode materials in energy storage devices, sensor technology, shielding of equipment from electromagnetic interference, solar cells, anticorrosive materials, wastewater treatment etc. One of the most important applications of these materials which has been attracting considerable attention recently is dissipation of electrostatic charge…”

Section: Introductionmentioning

confidence: 99%

Development of polyaniline/zinc oxide nanocomposite impregnated fabric as an electrostatic charge dissipative material

et al. 2015

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The paper presents the electrostatic charge dissipative performance of conducting polymer nanocomposite impregnated fabric based on polyaniline (PANI) and zinc oxide nanoparticles (ZnO NPs). Conducting polymer nanocomposites (PANI‐ZnO NPs) were synthesized by in situ chemical oxidative polymerization of aniline by using sodium dodecyl sulfate as surfactant and HCl as dopant. Coating of PANI‐ZnO nanocomposites on the cotton fabric was carried out during polymerization. The interaction of ZnO NPs with the PANI matrix was determined by Fourier transform infrared spectra (FTIR), TGA, XRD, scanning electron Microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and conductivity measurements. The conductivity of PANI‐ZnO NP coated fabric was found to be in the range 10−3 − 10−6 S cm−1 depending on the loading concentration of ZnO NPs in the polymer matrix. TEM and HRTEM images showed that the PANI‐ZnO nanocomposites had an average diameter of 25–30 nm and were nicely dispersed in the polymer matrix. Antistatic performance of the nanocomposite impregnated fabric was investigated by static decay meter and John Chubb instrument. The static decay time of the film was in the range 0.5 − 3.4 s on recording the decay time from 5000 V to 500 V. This indicated that the nanocomposite based on PANI‐ZnO nanocomposites has great potential to be used as an effective antistatic material. © 2015 Society of Chemical Industry

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Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

Cited by 40 publications

References 47 publications

Robust and Stable Cu Nanowire@Graphene Core–Shell Aerogels for Ultraeffective Electromagnetic Interference Shielding

Robust and Stable Cu Nanowire@Graphene Core–Shell Aerogels for Ultraeffective Electromagnetic Interference Shielding

Anticorrosive, Ultralight, and Flexible Carbon‐Wrapped Metallic Nanowire Hybrid Sponges for Highly Efficient Electromagnetic Interference Shielding

Development of polyaniline/zinc oxide nanocomposite impregnated fabric as an electrostatic charge dissipative material

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