Flexible Graphene Platelets Coated PVDF Membranes for High‐Performance Electromagnetic Shielding

Abstract

ABSTRACT With the increase in electronic equipments, the need for coating‐based electromagnetic interference shielding is on the rise. In this paper, a simple and cost‐effective strategy (vacuum‐filtration) is adopted to produce sub‐micron thick graphene nanoplatelet (GNP)‐coated PVDF membranes for effectively shielding the microwave frequencies. The effect of the interconnected network of GNP on the enhancement of shielding effectiveness is examined by adjusting the filtrate volume between 1 and 10 mL. This is discussed in relation to the structural and microstructural analysis conducted using XRD, FESEM, and Raman spectroscopy. Further, the shielding results are validated using a full wave solver, Ansys HFSS, and on‐field trial. A maximum of 24 dB is achieved for the coating thickness of ≤ 0.65 μm in the frequency range between 8 and 12 GHz, which paves the way for coating‐based shielding structures.