Multilayer RGOx＆PESy films for efficient electromagnetic shielding performance in a wide temperature range

In this work, the alternating multi-layer structured reduced graphene oxide＆polyether sulfone (RGOx&PESy) film is fabricated via a facile thermal pressure process, which has independently aligned packing layers to ensure the conductive network. The electromagnetic interference (EMI) shielding performance of the RGOx＆PESy film can be adjusted with facility by controlling the layer number of the pure RGO and PES films. At a fixed thickness of 0.35 mm, the shielding performance of the multi-layer structured films increases with the increased layer number of the RGO films. Especially, when the number of RGO film is seven, the RGO7&PES6 film provides an efficient EMI shielding performance of about 45 dB in the whole X-band with a low filler content of 7.39 wt%. Moreover, due to the excellent temperature stability of both RGO and PES, the effective EMI shielding performance can be maintained in the wide temperature range of 298 ∼ 473 K. This study provides a facile method for preparing the RGO-based EMI shielding film materials with excellent high-temperature resistance and ultra-low filler content.