4.7 Article

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

期刊

CHEMICAL ENGINEERING JOURNAL
卷 352, 期 -, 页码 510-518

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.07.064

关键词

Fe3O4; Lithium aluminum silicate (LAS) glass-ceramic; Electromagnetic wave absorption; Multiple transmission-absorption; Impedance matching

资金

  1. Taishan Scholar Project [ts201511080]
  2. National Natural Science Foundation of China [51672059, 51172050, 51102060, 51302050]
  3. Natural Scientific Research Innovation Foundation in Harbin Institute of Technology [HIT.NSRIF.2014129]

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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 (similar to 1.0) of Fe3O4@LAS/RGO is better and more stable than the Z(in) value (similar to 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.

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