A modified graphitic carbon nitride (MCN)/Fe3O4 composite as a super electromagnetic wave absorber

Abstract

Several composites of modified graphitic carbon nitride (MCN) and Fe₃O₄ particles were obtained through pyrolysing MCN/iron acetylacetone (Fe(acac)₃) at different temperatures to form electromagnetic wave (EWM) absorbers. By decreasing the nitrogen content of g-C₃N₄ and introducing Fe₃O₄ particles, the EMW absorption ability of the g-C₃N₄ derivatives (MCN/Fe₃O₄) improved remarkably. For MCN/Fe₃O₄-500 with 6 wt% filling, the minimum reflection loss (RL_min) reached −73.93 dB at a thickness of 3.4 mm and the effective absorption bandwidth (EAB) was as high as 5.44 GHz at a thickness of 1.9 mm. Additionally, the mass ratio of MCN and Fe₃O₄ and the EMW absorption mechanism of MCN/Fe₃O₄-500 were also discussed. This study provides a new approach for the preparation of high-efficiency EMW absorbers by modification of g-C₃N₄.