GO@Fe3O4@CuSilicate Composite with a Hierarchical Structure: Fabrication, Microstructure, and Highly Electromagnetic Shielding Performance

Ping Fan; Jiahao Tang; Shunxin Jia; Pengbo Liu; Jintao Yang; Feng Chen; Zhengdong Fei; Mingqiang Zhong

doi:10.1021/acsomega.9b04276

GO@Fe₃O₄@CuSilicate Composite with a Hierarchical Structure: Fabrication, Microstructure, and Highly Electromagnetic Shielding Performance

ACS Omega. 2020 Apr 2;5(14):7940-7949. doi: 10.1021/acsomega.9b04276. eCollection 2020 Apr 14.

Authors

Ping Fan¹, Jiahao Tang¹, Shunxin Jia¹, Pengbo Liu², Jintao Yang¹, Feng Chen¹, Zhengdong Fei¹, Mingqiang Zhong¹

Affiliations

¹ College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
² State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.

Abstract

Two nanocomposites with a hierarchical structure (GO@CuSilicate@Fe₃O₄ and GO@Fe₃O₄@CuSilicate) were fabricated in this paper. These as-synthesized nanocomposites were analyzed for their structural, compositional, and morphological features by X-ray diffraction, scanning electron microscopy (SEM), Raman spectroscopy, and Brunauer-Emmett-Teller methods. SEM images showed that both nanocomposites had a core-shell structure, and their shells were composed of CuSilicate nanoneedle arrays. Further, their total electromagnetic shielding efficiency was measured and compared in a wide frequency range of 8-12 GHz (X-band). Because of the "antenna" role of CuSilicate nanoneedle arrays and the polarization at the interface between graphene oxide (GO) and Fe₃O₄, GO@Fe₃O₄@CuSilicate showed higher electromagnetic shielding performance than that of GO@CuSilicate@Fe₃O₄. With 1 mm thickness, GO@Fe₃O₄@CuSilicate showed a high electromagnetic shielding efficiency (over 40 dB) in the whole X-band (8.2-12.4 GHz) and reached a maximum value (41.8 dB) at 8.2 GHz. Its total electromagnetic shielding efficiency was mainly contributed by absorption rather than reflection. This study provided an idea for the structural design of high-performance electromagnetic shielding materials in the GHz frequency range (X band).