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Table 2 Comparative study of shielding performance of single filler and a combination of fillers in the PC matrix

From: The journey of polycarbonate-based composites towards suppressing electromagnetic radiation

Sample details SET at 800 MHz (in dB) Percolation threshold Comments
PC/CB − 18.9 (at 10 wt% CB)
− 13.3 (at 8 wt% CB)
~ 2.3 vol% or 3.5 wt% High SET due to presence of highly branched CB
PC/CNT −18.4 (at 8 wt% CNT) ~ 0.8 vol% or 1.2 wt% High SET due to the high aspect ratio of CNT
PC/GNP − 6.3 (at 15 wt% GNP) ~ 4 vol% or 7 wt% Low SET due to the low aspect ratio of platelet structure
PC/CB/CNT −21.4 (at 5 wt% CB and 5 wt% CNT)   SET (dB) = − 0.947 + 0.2289 \( {w}_{CB}^2 \) +  3.0557 \( {w}_{CNT}^2 \); R2 = 0.99 and wCB, wCNT are weight percentages of CB and CNT, respectively.
PC/CB/GNP ~ − 9.2 (at 5 wt% CB and 5 wt% GNP)   SET (dB) = − 0.4492 wCB + 0.3153 \( {w}_{CB}^2 \) +  0.02849 \( {w}_{GNP}^2 \) +  0.11051 wCBwGNP; R2 = 1 and wCB, wGNP are weight percentages of CB and GNP, respectively.
PC/CNT/GNP ~ − 15.5 (at 5 wt% CNT and 5 wt% GNP)   SET (dB) = 0.56627 \( {w}_{CNT}^2 \) +  0.04642 \( {w}_{GNP}^2 \); R2 = 1 and wCNT, wGNP are weight percentages of CNT and GNP, respectively.