For the first time, Fe₃O₄@LAS/RGO composites with uniform size and extraordinary electromagnetic wave absorption properties were successfully synthesized by a simple three-step method. The Fe₃O₄ nanospheres with a diameter of about 200 nm are tightly attached by the lithium aluminum silicate (LAS) glass-ceramic particles with a diameter of about 20 nm and evenly distributed among the graphene sheets. The method of coating a microwave absorber with a wave-transparent material introduces a multiple transmission-absorption mechanism for the material to effectively improve impedance matching. The input impedance Z_in value (∼1.0) of Fe₃O₄@LAS/RGO is better and more stable than the Z_in value (∼1.2) of Fe₃O₄/RGO. The RL values of Fe₃O₄@LAS/RGO could reach −65 dB at 12.4 GHz with a thickness of only 2.1 mm and the absorption bandwidth with RL values less than −10 dB (over 90% electromagnetic wave absorption) is up to 4 GHz at the corresponding thickness. The intrinsic properties of the component of Fe₃O₄@LAS/RGO composites and the composite structure of the material lead to a variety of microwave absorption mechanisms acting together to improve the microwave absorption properties of the composites.

首次通过简单的三步法成功合成了尺寸均匀，电磁波吸收性能优异的Fe ₃ O ₄ @ LAS / RGO复合材料。直径约200nm的Fe ₃ O ₄纳米球被直径约20nm的硅酸锂铝（LAS）玻璃-陶瓷颗粒紧密地附着，并均匀地分布在石墨烯片之间。用波透明材料涂覆微波吸收器的方法引入了用于材料的多重透射吸收机制，以有效地改善阻抗匹配。输入阻抗Z_在值的Fe（〜1.0）₃ Ô ₄@ LAS / RGO比在Z更好，更稳定_的铁的值（〜1.2）₃ ö ₄ / RGO。Fe ₃ O ₄ @ LAS / RGO的RL值在12.4 GHz时可以达到-65 dB，厚度仅为2.1 mm，并且RL值小于-10 dB（超过90％电磁波吸收）的吸收带宽高达在相应的厚度下为4 GHz。Fe ₃ O ₄ @ LAS / RGO复合材料的组分的固有特性和材料的复合结构导致多种微波吸收机理共同作用，以改善复合材料的微波吸收特性。