Magnetic/dielectric composites offer good impedance matching for electromagnetic wave absorption, though achieving both strong absorption and broadband absorption in such composites is challenging. Herein polypyrrole-Maghemite-graphitic carbon nitride (PPy/γ-Fe₂O₃/g-C₃N₄) composites were successfully fabricated via the one-step chemical synthesis of PPy/γ-Fe₂O₃ nanospheres in the presence g-C₃N₄ nanosheets. The PPy/γ-Fe₂O₃/g-C₃N₄ composites demonstrated outstanding electromagnetic wave (EMW) absorption properties at microwave frequencies. A compositionally optimized PPy/γ-Fe₂O₃/g-C₃N₄ composite delivered a minimum reflection loss (RL_min) value of −53.66 dB at 11.92 GHz and the effective absorption bandwidth (EAB, RL < −10 dB) of 5.13 GHz (10.46–15.59 GHz) at a thickness of 2.5 mm. The excellent EMW absorption properties of the composite could be attributed to the introduction of g-C₃N₄ nanosheets with a lamella structure, which enhanced interfacial polarization losses, multi-reflections, scattering, and impedance matching within the composite. This work offers a simply and effective strategy for the preparation of high-performance EMW absorbers.

磁性/电介质复合材料为电磁波吸收提供了良好的阻抗匹配，尽管在此类复合材料中实现强吸收和宽带吸收都具有挑战性。本文聚吡咯的磁赤铁矿石墨碳氮化物（聚吡咯/γ-的Fe ₂ ö ₃ / GC ₃ Ñ ₄）复合材料被成功地通过聚吡咯的单步化学合成/γ-铁制成_2个Ó ₃在存在GC纳米球₃ Ñ ₄纳米片。聚吡咯/γ-的Fe ₂ ö ₃ / GC ₃ Ñ ₄复合材料在微波频率下表现出出色的电磁波（EMW）吸收性能。在组成优化的PPy /γ-的Fe ₂ ö ₃ / GC ₃ Ñ ₄复合递送的最小重挠度损耗（RL_分钟在11.92 GHz和5.13的有效吸收带宽（EAB，RL <-10分贝）的-53.66分贝）值GHz（10.46–15.59 GHz），厚度为2.5毫米。复合材料优异的EMW吸收性能可归因于gC ₃ N ₄的引入具有薄片结构的纳米片，可增强复合材料中的界面极化损耗，多重反射，散射和阻抗匹配。这项工作为制备高性能EMW吸收器提供了简单有效的策略。