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Reduced Graphene Oxide Bubbles with Tunable Electromagnetic Shielding Effectiveness

Abstract Reduced graphene oxide (rGO) bubbles containing sphere-like pores inside are prepared using polystyrene (PS) micro-balls as template. rGO bubbles exhibit excellent electromagnetic interference (EMI) shielding effectiveness in frequency range of 8–12 GHz. The shielding can be attributed to absorption mechanism which is a synergistic effect of conductive rGO sheets and repeated reflection inside the sphere-like pores. Furthermore, EMI shielding effectiveness can be tuned by heat-treated temperature, pore size and ratio. The EMI shielding effectiveness of rGO bubbles can reach to 54 dB with 5 μm pores of 25 wt% content as well as thermally annealed at 800 °C.