Highly conductive and flexible nano-structured carbon-based polymer nanocomposites with improved electromagnetic-interference-shielding performance

Mondal, Subhadip; Ghosh, Sabyasachi; Ganguly, Sayan; Das, Poushali; Ravindren, Revathy; Sit, Subhashis; Chakraborty, Goutam

doi:10.1088/2053-1591/aa9032

Cited by 66 publications

(37 citation statements)

References 36 publications

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“…Physics of EM wave reflection and absorption, particularly in a granular or composite sample, is complex. Nevertheless, it has been discussed in texts and few papers, achieving partial understanding of the processes.…”

Section: Selective Overview and Materials Selectionmentioning

confidence: 99%

“…Out of many post‐2010 papers like, results of one interesting publication will now be summarized. Schettini et al studied PAni‐DBSA and PAni‐DBSA/STF samples over X‐band 8.2–12.4 GHz, where PAni = Poly‐aniline, DBSA = Dodecylbenzenesulfonic acid for EM shielding, and RAM applications.…”

Section: Selective Overview and Materials Selectionmentioning

confidence: 99%

“…Electromagnetic Interference (EMI) shielding efficiency (SE) is highest for suitable metal sheets. But to make the shield flexible and light, the world is innovating polymer composites as the 2nd generation group of EMI shielding materials . Moreover, polymers including plastics have now reduced the dominating role of metals and alloys in the world of practical materials.…”

Section: Introductionmentioning

confidence: 99%

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Polymer Composites for Flexible Electromagnetic Shields

Sahu¹,

De²

2018

Macromolecular Symposia

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Harmful electromagnetic (EM) interference (EMI) to living beings and various sensitive instruments by EM radiations from electronic and electrical gadgets and mobile towers is increasing rapidly. It inflicts illness, and presumably cancerous growth in human cells. EMI is minimized by wrapping the receiver and/or the emitter gaplessly by an efficient EM shielding sheet. Compared to the widely used and classical metallic shields, 2nd generation polymer composite EMI shields are lighter and more flexible. Conventional polymer composites use conducting polymers and metallic/carbon powders that have conducting electrons to reflect EM waves away. A polymeric binder, curing overnight to a soft and flexible sheet, has presently been selected for making the polymeric composites. We test EM shielding by certain non‐metallic composites. We review results for composites with fine metallic fibers (copper and brass turnings, available as waste from mechanical workshops) or conducting forms of cadmium oxide or ferroelectric materials (PbNb2O6 [o‐PN] & BaTiO3 [BT]) or their mixtures (52 samples). Small pieces of these cloth‐like polymeric sheets have been characterized in a Vector Network Analyzer (VNA), by measuring input power (Pin), the reflected power (Prefl), and the transmitted power (Pout), over five frequency bands in 700 MHz to 40 GHz range to find Shielding Effectiveness (SE) = 10 log (Pout/Pin) and Reflection Effectiveness = 10 log (Prefl/Pin). Success of o‐PN, BT, conducting (fired) Cd‐O, metallic turnings and their combinations has been discussed, highlighting some new observations. Composites, developed in this work, include EMI Shielding materials and potential Radar Absorption Materials.

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Section: Selective Overview and Materials Selectionmentioning

confidence: 99%

Section: Selective Overview and Materials Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polymer Composites for Flexible Electromagnetic Shields

Sahu¹,

De²

2018

Macromolecular Symposia

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“…Recently, conductive polymer composites (CPCs) have been intensely developed for EMI shielding applications, such as automobiles, flexible electronics and wearable devices, where lightweight and flexible materials are required [10][11][12][13][14][15][16][17][18]. Carbon materials such as carbon nanotubes, graphene, and carbon nanofibers are intensely developed as the fillers in CPCs because of their excellent electrical conductivity and stability [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Highly Conductive PDMS Composite Mechanically Enhanced with 3D-Graphene Network for High-Performance EMI Shielding Application

Tang

et al. 2020

Nanomaterials

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A highly conductive three-dimensional (3D) graphene network (GN) was fabricated by chemical vapor deposition on a 3D nickel fiber network and subsequent etching process. Then a lightweight and flexible polydimethylsiloxane (PDMS)/GN composite was prepared by a vacuum infiltration method by using the graphene network as a template. The composite showed the superior electrical conductivity of 6100 S/m even at a very low loading level of graphene (1.2 wt %). As a result, an outstanding electromagnetic interference (EMI) shielding effectiveness (SE) of around 40 and 90 dB can be achieved in the X-band at thicknesses of 0.25 and 0.75 mm, respectively, which are much higher than most of the conductive polymers filled with carbon. The 3D graphene network can also act as a mechanical enhancer for PDMS. With a loading level of 1.2 wt %, the composite shows a significant increase by 256% in tensile strength.

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“…Electromagnetic radiation from different electrical and electronic devices deteriorates the normal functioning of electronic devices and also causes adverse environmental issues in day‐to‐day life. Electromagnetic interference (EMI) shielding states the reflection and/or absorption of electromagnetic radiation by the material which thus acts as a shield against the penetration of EM radiation through them . Metals, being electrically conductive, exhibit excellent shielding efficiency and are considered as a classical EMI shielding material.…”

Section: Introductionmentioning

confidence: 99%

Superior electromagnetic interference shielding effectiveness and low percolation threshold through the preferential distribution of carbon black in the highly flexible polymer blend composites

et al. 2018

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Carbon black distribution in different phases of blends affects the percolation threshold and electrical properties and electromagnetic interferences (EMIs) shielding effectiveness to a great extent. We addressed the challenge of developing a light weight and highly flexible superior EMI shielding material by combining ethylene methyl acrylate (EMA) and ethylene octane copolymer (EOC) with conductive carbon black. The selective distribution of filler particle in the EMA phase facilitates the way for double percolation phenomenon which signifies higher electrical conductivity properties. This percolated filler network development is revealed from the field emission scanning electron microscopy and TEM analysis. This newly developed conductive blend demonstrates superior EMI shielding efficiency of −31.4 dB together with promising mechanical and thermal properties. POLYM. COMPOS., 40:1404–1418, 2019. © 2018 Society of Plastics Engineers

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Highly conductive and flexible nano-structured carbon-based polymer nanocomposites with improved electromagnetic-interference-shielding performance

Cited by 66 publications

References 36 publications

Polymer Composites for Flexible Electromagnetic Shields

Polymer Composites for Flexible Electromagnetic Shields

Highly Conductive PDMS Composite Mechanically Enhanced with 3D-Graphene Network for High-Performance EMI Shielding Application

Superior electromagnetic interference shielding effectiveness and low percolation threshold through the preferential distribution of carbon black in the highly flexible polymer blend composites

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