Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2018-07-09 , DOI: 10.1016/j.cej.2018.07.064 Yanan Yang , Long Xia , Tao Zhang , Bin Shi , Longnan Huang , Bo Zhong , Xinyu Zhang , Huatao Wang , Jian Zhang , Guangwu Wen
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 Zin value (∼1.0) of Fe3O4@LAS/RGO is better and more stable than the Zin 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.
中文翻译:
具有多重传输吸收机制和增强的电磁波吸收性能的Fe 3 O 4 @ LAS / RGO复合材料
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。