Table S2. Microwave Absorption Properties of graphene-based Composites Absorbers Magnetic-material d (mm) Minimum Peak location Bandwidth Test Ref. morphology RL (dB) (GHz) (Range, GHz) temperature RGO/Bi2Fe4O9 Microsphere 2.00 -71.88 13.8 11.92-16.16 298K 16 ZnO-Ni-C/RGO yolk-shell 2.05 -59.30 15.2 12.40-18.00 298K 17 CoFe2O4/RGO Particle 1.60 -46.80 11.6 10.00-13.44 298K 18 Co2Z/RGO Plate 2.00 -35.20 14.7 12.00-16.24 298K 19 Co3O4/RGO Nanosheet 3.60 -45.15 10.5 8.31-13.92 298K 13 Co3O4-rGO Micro flower 2.40 -61.00 11.2 9.60-13.40 298K This 1.8-1.9 -38.30 12.1 8.30-12.40 353-473K work References [1] C.Z. He, S. Qiu, X.Z. Wang, J.R. Liu, L.Q. Luan, W. Liu, M. Itoh, K. Machida, Facile Synthesis of Hollow Porous Cobalt Spheres and Their Enhanced Electromagnetic Properties, J. Mater. Chem. 22 (2012) 22160-22166. [2] X.L. Shi, M.S. Cao, J. Yuan, X.Y. Fang, Dual nonlinear dielectric resonance and nesting
Table S2. Microwave Absorption Properties of graphene-based Composites Absorbers Magnetic-material morphology d (mm) Minimum RL (dB) Peak location (GHz) Bandwidth (Range, GHz) Test temperature Ref. RGO/Bi2Fe4O9 Microsphere 2.00 -71.88 13.8 11.92-16.16 298K 16 ZnO-Ni-C/RGO yolk-shell 2.05 -59.30 15.2 12.40-18.00 298K 17 CoFe2O4/RGO Particle 1.60 -46.80 11.6 10.00-13.44 298K 18 Co2Z/RGO Plate 2.00 -35.20 14.7 12.00-16.24 298K 19 Co3O4/RGO Nanosheet 3.60 -45.15 10.5 8.31-13.92 298K 13 Co3O4-rGO Micro flower 2.40 -61.00 11.2 9.60-13.40 298K This work 1.8-1.9 -38.30 12.1 8.30-12.40 353-473K References [1] C.Z. He, S. Qiu, X.Z. Wang, J.R. Liu, L.Q. Luan, W. Liu, M. Itoh, K. Machida, Facile Synthesis of Hollow Porous Cobalt Spheres and Their Enhanced Electromagnetic Properties, J. Mater. Chem. 22 (2012) 22160-22166. [2] X.L. Shi, M.S. Cao, J. Yuan, X.Y. Fang, Dual nonlinear dielectric resonance and nesting
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