▎ 摘　　要

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 mu m pores of 25 wt% content as well as thermally annealed at 800 degrees C. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.