Abstract
In this article, the marriage of (Ag@CDots) and PVA has been done via the solution casting approach for the electromagnetic shielding performance. Decoration of Ag on the CDots surface is performed by precipitation method in order to increase the conductivity of the nano-composite. The synergetic effect of nanofillers on the morphology, structure, mechanical, dielectric and electrical properties has been extensively studied. SEM analysis has displayed a high dispersion and an excellent adhesion of Ag@CDots in PVA template. The conductivity tends to increase, when Ag@CDots increased, to be 31.95 S/m at 8 wt.% of Ag@CDots due to formation of conductive path of Ag@CDots. Also, the dielectric constant increases with increasing Ag@CDots nano-particles due to formation of microcapacitors in the template of nano-composite. Young's modulus has dramatically increased up to 9.1 ± 0.71 GPa for 8 wt.% of Ag@CDots. Ag@CDots/PVA nano-composite displays the total shielding effectiveness (SET) of electromagnetic interface (EMI) of 56 dB at 8 GHz at thickness 1 mm, due to the equal contribution of EM reflection and absorption in the main mechanism of shielding effectiveness. Finally, the fine dispersion and the brilliant features harmonize together to make (Ag@CDots/PVA) nano-composites having a high total value of shielding (SET) and producing a shielding in X-band range about 99.9 % of electromagnetic radiation.
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