Carbon Nanotube Composites as Electromagnetic Shielding Materials in GHz Range

González, Marta; Mokry, Guillermo; Nicolás, María de; Baselga, Juan; Pozuelo, Javier

doi:10.5772/62508

Cited by 30 publications

(28 citation statements)

References 65 publications

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“…Gonzalez et al reported that the reflection from CNT and graphene is approximately 10 dB with an absorption of 20 dB. At the same time, ultrathin graphene-based composites have also shown a lower reflection of approximately 10 dB [ 75 , 83 , 84 , 85 ]. According to Zhao et al the EMI shielding of the PVDF/graphene composite was 22.58 dB at a thickness 0.1 mm and electrical conductivity of 6.56 × 10 −3 S·cm −1 [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Electromagnetic Shielding by MXene-Graphene-PVDF Composite with Hydrophobic, Lightweight and Flexible Graphene Coated Fabric

et al. 2018

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MXene and graphene based thin, flexible and low-density composite were prepared by cost effective spray coating and solvent casting method. The fabricated composite was characterized using Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray (EDX). The prepared composites showed hydrophobic nature with higher contact angle of 126°, −43 mN·m−1 wetting energy, −116 mN·m−1 spreading Coefficient and 30 mN·m−1 lowest work of adhesion. The composites displayed excellent conductivity of 13.68 S·cm−1 with 3.1 Ω·sq−1 lowest sheet resistance. All the composites showed an outstanding thermal stability and constrain highest weight lost until 400 °C. The MXene-graphene foam exhibited excellent EMI shielding of 53.8 dB (99.999%) with reflection of 13.10 dB and absorption of 43.38 dB in 8–12.4 GHz. The single coated carbon fabric displayed outstanding absolute shielding effectiveness of 35,369.82 dB·cm2·g−1. The above results lead perspective applications such as aeronautics, radars, air travels, mobile phones, handy electronics and military applications.

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Section: Resultsmentioning

confidence: 99%

Electromagnetic Shielding by MXene-Graphene-PVDF Composite with Hydrophobic, Lightweight and Flexible Graphene Coated Fabric

et al. 2018

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“…Therefore, tailoring the fraction and size of pores created on the surface of a conductive compound will help to modulate the phenomenon of electromagnetic reflection. Minimizing reflection, a larger fraction of the radiation will penetrate into the material, being able to dissipate it by absorption …”

Section: Foam‐based Materialsmentioning

confidence: 99%

Electromagnetic Shielding Materials in GHz Range

González

Pozuelo

Baselga

2018

The Chemical Record

Self Cite

119

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The state-of-the art in the design and the manufacture methods of the different electromagnetic shielding materials has been reviewed. This topic has become a mainstream field of research because of the electromagnetic pollution generated by telecommunication technology development. The review is centred in absorbent materials and shows a general overview of how the absorption properties of such composites can be tailored through changes in geometry, composition, morphology, and the filler particles content. Although different types of materials are explained, the text is mainly focused on carbon materials such as graphene and carbon nanotubes. In this way, the importance of the dispersion of the conductive fillers in different polymer matrices is discussed. In addition, an extensive study on new complex architectures such as foam-based materials is presented. Finally, the combination of carbon fillers with other constituents such as metallic nanoparticles is mentioned. In all these studies, the efficiency of the composites as absorbent or reflective of electromagnetic radiation is discussed.

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“…Khan et al reported that both electrical conductivity and permittivity are important factor for the improvement of total shielding effectiveness. On the other hand, It was also reported the small difference in the conductivity caused by the type of CNT . Polymer matrix composites with high electrical conductivity assist in reducing or eradicating the seams in the housing that is the shield.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of hybrid PANI/MWCNT nanocomposites for EMI applications

Kumar

et al. 2017

Polymer Composites

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The present study reports on a simple and very efficient solution mixing method for the preparation of functionalized multiwalled carbon nanotube/polyaniline nanocomposites (f‐MWCNT/PANI) for electromagnetic interference (EMI) application. The synthesized composites have been characterized by different physiochemical techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffractometry (XRD), and Fourier transform infrared (FT‐IR) spectroscopy. The electron microscopy analysis of nanocomposites reveals the good dispersion and agglomeration of CNT in PANI matrix at higher concentration. X‐ray study shows the higher crystallinity of PANI with the addition of f‐MWCNT. FTIR spectroscopy has confirmed the interactions of the carbonyl group of f‐MWCNT with the quinoid ring of PANI. The resulting f‐MWCNT/PANI nanocomposites (0 to 21 vol% CNT) shows higher electrical conductivity than that of pure PANI due to the formation of conducting path between CNT and PANI matrix. The increased electrical conductivity of nanocomposites also improved the estimated EMI shielding. The percolation threshold was found to occurs at 0.1 vol% of f‐MWCNT, where the DC electrical conductivity started to increase abruptly. The one‐order increment in electrical conductivity was observed which is 12 times more than that of pure PANI. The DC electrical conductivity of nanocomposite at 3.3 vol% and 13.9 vol% of f‐MWCNT was 1.6 × 10−1 S/cm and 1.8 × 10−1 S/cm, respectively. In addition, the estimated EMI shielding of nanocomposites at 3.3 vol% of f‐MWCNT and beyond it was found to be 12dB. POLYM. COMPOS., 39:3858–3868, 2018. © 2017 Society of Plastics Engineers

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Carbon Nanotube Composites as Electromagnetic Shielding Materials in GHz Range

Cited by 30 publications

References 65 publications

Electromagnetic Shielding by MXene-Graphene-PVDF Composite with Hydrophobic, Lightweight and Flexible Graphene Coated Fabric

Electromagnetic Shielding by MXene-Graphene-PVDF Composite with Hydrophobic, Lightweight and Flexible Graphene Coated Fabric

Electromagnetic Shielding Materials in GHz Range

Synthesis and characterization of hybrid PANI/MWCNT nanocomposites for EMI applications

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