▎ 摘　　要

Ternary nanocomposites comprising of a conducting carbon structure, a magnetic component, and a polymer matrix are of current scientific interest in electromagnetic interference (EMI) shielding applications. In the present work, we explore the utility of reduced graphene oxide (RGO)/PdNi/poly(ethylene-co-vinyl acetate) (EVA) ternary nanocomposites in such applications. The nanocomposites with 0-5 wt % RGO/PdNi filler content in EVA matrices are prepared by a combination of modified Hummer's, reflux, and solution mixing methods. Microscopic imaging, and diffraction and spectroscopic measurements assure the correct size, crystallinity and phases, and desirable magnetic nature of the nanocomposites. The abilities of EM wave reflection and absorption in 2-8 GHz (S-band +C-band) range are found to increase incrementally with increasing filler content. Nano composites with 1 and 5 wt % filler content exhibit similar to 12-30 dB shielding efficiencies (SE's), with maxima in Sand C-band, respectively. An analysis of the electrical conductivity, dielectric permittivity and magnetic permeability suggests that there is a scope to enhance the SE further by varying the Pd:Ni and RGO:alloy ratios. Mechanical and thermal characterisations reveal that the nanocomposites desirably have both the mechanical strength and the thermal stability better than the EVA matrix. Thus, the RGO/PdNi/EVA nanocomposites are found to have a potential in EMI shielding applications.