Composites of an Epoxy Resin (EP)/PVDF/NiCo-Graphene Nanosheet (GNS) for Electromagnetic Shielding

In this study, a series of three-dimensional (3D) epoxy resin/poly(vinylidene fluoride)/nickel–cobalt alloy–graphene nanosheet (EP/PVDF/NiCo-GNS) composites with high thermal conductivity and electromagnetic interference shielding effectiveness (EMI SE) were successfully prepared using a salt template-assisted strategy. X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses jointly presented the successful modification of GNS and in situ growth of NiCo alloy. The cross-sectional morphological observations on the PVDF/NiCo-GNS skeleton and epoxy-based composites clearly showed the successful construction of a honeycomb-like heat conduction network. At a NiCo-GNS loading of 15 wt %, the prepared composites' EMI SE could reach a value of 34.62 dB. The special structures not only perfected the interconnected thermally and electrically conductive network but also facilitated the multiple internal reflections of electromagnetic waves inside the composites. The present work provides an insight into the design of multifunctional polymer-based composites for electronic 3D encapsulation applications.