Outstanding electromagnetic interference shielding of silver nanowires: comparison with carbon nanotubes

Abstract

Silver nanowires (AgNWs) were synthesized by AC electrodeposition of Ag into porous aluminum oxide templates. AgNWs were embedded into polystyrene via a solution processing technique to create a nanocomposite. For comparison, carbon nanotube (CNT)/polystyrene nanocomposites were identically generated. TEM and XRD analyses confirmed the synthesis of AgNWs with an average diameter and length of 25 nm and 3.2 mm, respectively. TEM images also revealed that at the molding temperature (240 C) AgNWs transformed into a chain of nanospheres. At low filler loadings, the AgNW/polystyrene nanocomposites presented inferior electrical properties compared to the CNT/polystyrene nanocomposites. This was attributed to a lower aspect ratio, fragmentation phenomenon and poorer conductive network for AgNWs. However, at high filler loadings, the electrical properties of the AgNW/polystyrene nanocomposites significantly increased. It seems that at high filler loadings, the conductive network was well-established for both types of nanocomposites and thus, the higher innate conductivity of AgNWs played a dominant role in presenting superior electrical properties. Fig. 5 EMI SE (overall, reflection and absorption) of AgNW/PS and MWCNT/PS nanocomposites as a function of nanofiller loading.Fig. 6 (a) Imaginary permittivity, and (b) real permittivity as a function of nanofiller loading. 56596 | RSC Adv., 2015, 5, 56590-56598 This journal is

Electromagnetic interference shielding properties and mechanisms of chemically reduced graphene aerogels

“…2). The observation was contradictory to the previous outcomes that higher electrical conductivity [1,12,38,44] or better connected network [13,[45][46][47] contributed to higher EMI SE. In our case, the amount of rGO within GA could be increased by increasing either the thickness of the GA or the initial GO concentration.…”

Substantially improving mechanical property of double percolated poly(phenylene sulfide)/poly(arylenesulfide sulfone)/graphene nanoplates composites with superior electromagnetic interference shielding performance

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“…It is worth noting that when the GNPs loading is only 1.0 wt %, the average EMI SE of D-PPS/PASS/GNPs is 27.7 dB, which meets the requirement (20 dB) for commercially EMI shielding equipment. 46,47 The value shows that the D-PPS/PASS/GNPs-1.0 composites have the capability to block 99.83% electromagnetic wave radiation. In addition, the EMI SE of the D-PPS/PASS/ GNPs-1.0 composite exhibits a different trend than other composites with the increase of frequency, because a perfect conductive network cannot be constructed at low filler content.…”

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