Electromagnetic interference shielding of segregated polymer composite with an ultralow loading ofin situthermally reduced graphene oxide

Abstract

An in situ thermally reduced graphene/polyethylene conductive composite with a segregated structure was fabricated, which achieved a high electromagnetic interference shielding effectiveness of up to 28.3-32.4 dB at an ultralow graphene loading of 0.660 vol.%. Our work suggests a new way of effectively using graphene.

Cellulose composite aerogel for highly efficient electromagnetic interference shielding

“…S2, ESI †); thus, it is reasonable that the absorption is the dominant shielding mechanism in the X-band frequency range for such green conductive composite aerogels. 5,14,19,20 …”

Permittivity and Electromagnetic Interference Shielding Investigations of Activated Charcoal Loaded Acrylic Coating Compositions

“…It is important to point out that addition of AC leads to improvement in electrical conductivity as well as permittivity, which collectively contributes towards improved antiradiation performance. The above attenuation value is near the total shielding value of −30 dB for phase segregated composites based on 0.66 vol% [37] loading of reduced graphene oxide in thermoplastic matrix. However, the use of activated charcoal (cheap, porous, and electrically conducting filler), compared to other nanofillers (costly, difficult to process due to agglomeration and dispersion issues, and commercially unviable) to obtain comparable EMI shielding performance (at lesser thickness), highlights the technological importance of our work.…”

Facile, green and affordable strategy for structuring natural graphite/polymer composite with efficient electromagnetic interference shielding

“…1,2 The past decades have witnessed the revolutionary development of conductive polymer composites (CPCs) as promising advanced materials for EMI protection. [3][4][5] Compared to the traditional metal-based EMI shielding materials, CPCs desirably offer unique strengths in enabling the achievement of light weight, easy processability, chemical resistance, and tunable electronic conductivity over a wide range. [6][7][8][9][10] Recently, much attention has been paid to the development of novel EMI shielding CPCs based on various carbon nanollers, such as carbon nanober (CNF), 11 carbon nanotube (CNT), 12,13 and graphene nanosheet (GNS).…”

“…22 For example, Pham et al fabricated a graphene/poly(methyl methacrylate) segregated composite, presenting a percolation threshold as low as 0.16 vol% and an electrical conductivity of 64 S m À1 at only 2.7 vol%. 23 5 It should be noted that the available CPCs with segregated structure are mainly based on nanollers with high aspect ratio, and the agglomeration of nanollers invariably exists, especially at relatively high loading for EMI shielding application. 24 Then what will happen in electrical and EMI shielding performance if micro-scale and economical graphite is introduced to the segregated CPCs?…”

“…The obtained EMI SE is much higher than the results for graphite randomly distributed CPCs, 18,25 and even comparable to the results for CPCs containing CNF, 26,27 CNT 28,29 or GNS. 4,4,5,30 It is worth mentioning that the fabrication of the segregated composite in this work is involved in mechanical mixing plus hot compaction method, without the use of any organic solvent, showing a facile, green and affordable strategy for developing efficient EMI shielding materials.…”