Polymer nanocomposite foam filled with carbon nanomaterials as an efficient electromagnetic interference shielding material

Dhakate, Sanjay R.; Subhedar, Kiran M.; Singh, Bhanu Pratap

doi:10.1039/c5ra03409d

Cited by 119 publications

(63 citation statements)

References 101 publications

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“…In this measurement, we could not obtain the S 11 and S 21 parameters. 75 Despite the unreliable EMI SE predictions made by eqn (2) and (3), these two equations can be used as criterions to anticipate the general effects of different parameters on the EMI SE at 30 MHz to 1.5 GHz. Moreover, it is worth noting that it is unreliable to calculate the SE R and SE A at 30 MHz to 1.5 GHz for composite foams according to the eqn (2) and (3).…”

Section: Emi Shielding Performance Of Silver Nanollers/ Polyimide Comentioning

confidence: 99%

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

2015

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Silver nanofillers of three different shapes were synthesized: silver nanospheres (AgNSs), silver nanowires (AgNWs) and silver nanowires-silver nanoplatelets (AgNWPs). Ultra-lightweight polyimide (PI) composite foams filled with these three silver nanofillers were fabricated by a facile and effective one-pot liquid foaming process, respectively. Their microstructure, electromagnetic interference (EMI) shielding effectiveness (SE) and shielding mechanisms were investigated. It was found that, at the same nanofiller loading, the EMI SE of the composite foams decreased in the following order: AgNWPs > AgNWs > AgNSs. AgNWPs/PI composite foams exhibited the highest EMI SE owing to the denser 3D conductive network of AgNWPs compared to AgNWs and AgNSs, in which the seamlessly interconnected AgNWPs network provided fast electron transport channels inside foams. Maximum specific EMI SE values of 1208 dB g À1 cm 3 at 200 MHz, 650 dB g À1 cm 3 at 600 MHz, and 488 dB g À1 cm 3 in the frequency ranges of 800-1500 MHz, 216-249 dB g À1 cm 3 at 8-12 GHz were achieved in the composite foams at 4.5 wt% AgNWPs loading, which far surpass the best values of other composite materials. The reflections of interconnected AgNWPs networks inside the foams combined with absorptions resulting from the multiple reflections at interfaces inside the foams contributed to the shielding effect. This suggests that our AgNWPs/PI composite foams have excellent potential as high-performance EMI shielding materials against electromagnetic interference pollution in applications that need lightweight. Fig. 7 Dispersion of silver nanostructures in composite foams for PIF-P, PIF-W and PIF-WS: (middle) FESEM images of cell walls; (left) FESEM images of the distribution of silver nanostructures in cell membranes; (right) FESEM images of the distribution of silver nanostructures in cell walls.This journal is

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Section: Emi Shielding Performance Of Silver Nanollers/ Polyimide Comentioning

confidence: 99%

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

2015

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“…[1][2][3][4] Among the carbon-based nano-fillers, graphene has generated much interest all over the world due to its unique structure and properties. [5][6][7] Graphene has the potential to reinforce mechanical, thermal, and electrical properties of various polymers in many applications, there have been many reports on this subject.…”

Section: Introductionmentioning

confidence: 99%

Influence of structure of amines on the properties of amines‐modified reduced graphene oxide/polyimide composites

Wang

Dai

2016

J of Applied Polymer Sci

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Graphene oxide (GO), as an important precursor of graphene, was functionalized using alkyl-amines with different structure and then reduced to prepare reduced amines grafted graphene oxide (RAGOs) by N 2 H 4 Á H 2 O. The successful chemical amidation reaction between amine groups of alkyl-amines and carboxyl groups of GO was confirmed by Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), and thermal gravimetric analysis (TGA). Then RAGOs/polyimide nanocomposites were prepared via in situ polymerization and thermal curing process with different loadings of RAGOs. The modification of amine chains lead to homogenous dispersion of RAGOs in the composites and it formed strong interfacial adhesion between RAGOs and the polymer matrix. The mechanical and electrical properties of polyimide (PI) were significantly improved by incorporation of a small amount of RAGOs, the influence of structure of amines grafted on RAGOs on the enhancement effects of composites was discussed. The research results indicated that the proper structure of amine could effectively enhance the properties of composites. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43820.

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“…Great progress has been made in the development of graphene/polymer composite including sandwich, foam, segregated and porous structured materials for shielding application, but further progress is still needed for the implementation of these materials and their viable and cheap manufacturing. 12,[17][18][19] Wen and co-workers reported lightweight composites of 20 wt% rGO reaches EMI shielding of -38 dB. 20 In further study, ultrathin graphene composites with absorption value of ∼ -15 dB and reflection loss of -30 dB has been reported.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12][13][14][15][16][17][18] However, there is still lack of flexible and light weight shielding materials, which is required for current electronics/devices. Graphene-based composite materials have been attracted a significant research interest due to their remarkable properties including low density, high surface area, large aspect ratios, versatile processing, ultrahigh electrical conductivity and excellent mechanical stiffness.…”

Section: Introductionmentioning

confidence: 99%

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

Kumar

Cho

et al. 2017

AIP Advances

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Here, we study the self-aligned asymmetric electrically conductive composite thin film prepared via casting of graphene oxide (GO)/poly (vinylidene-hexafluoropropylene) (PVDF-HFP) dispersion, followed by low temperature hydriodic acid reduction. The results showed that composite thin film revealed the high orientation of graphene sheets along the direction of film surface. However, graphene sheets are asymmetrically distributed along the film thickness direction in the composite film. Both sides of as prepared composite film showed different surface characteristics. The asymmetric surface properties of composite film induced distinction of surface resistivity response; top surface resistivity (21 Ohm) is ∼ 4 times higher than bottom surface resistivity (5 Ohm). This asymmetric highly electrically conducting composite film revealed efficient electromagnetic interference (EMI) shielding effectiveness of ∼ 30 dB. This study could be crucial for achieving aligned asymmetric composite thin film for high-performance EMI shielding radiation.

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Polymer nanocomposite foam filled with carbon nanomaterials as an efficient electromagnetic interference shielding material

Abstract: Among different carbon nanomaterial foam-filled polymer composites, graphene-based foam gives superior specific shielding effectiveness when compared to typical metals.

Cited by 119 publications

References 101 publications

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

Influence of structure of amines on the properties of amines‐modified reduced graphene oxide/polyimide composites

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

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