Fe3O4@LAS/RGO composites with a multiple transmission-absorption mechanism and enhanced electromagnetic wave absorption performance

By Yanan Yang, L. Xia, Tao Zhang, Bin Shi, Longnan Huang, B. Zhong, Xinyu Zhang, Huatao Wang, Jian Zhang, G. Wen. Chemical Engineering Journal, 2018

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Abstract 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.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/3c8641f81854047057ebdb971e36221f749da916