Enhanced electromagnetic interference shielding efficiency of polystyrene/graphene composites with magnetic Fe sub(3)O sub(4) nanoparticles

• Published in: Carbon (New York) Vol. 82; pp. 67 - 76
• Main Authors: Chen, Yu, Wang, Yongli, Zhang, Hao-Bin, Li, Xiaofeng, Gui, Chen-Xi, Yu, Zhong-Zhen
• Format: Journal Article
• Language: English
• Published: 01.02.2015
• Subjects: Electrical resistivity; Electromagnetic interference; Graphene; Nanoparticles; Oxides; Polymer matrix composites; Polystyrene resins; Resistivity; Shielding
• ISSN: 0008-6223
• DOI: 10.1016/j.carbon.2014.10.031

Polystyrene (PS) composites with satisfactory electromagnetic interference (EMI) shielding performance were prepared by solution blending of PS with thermally exfoliated and reduced graphene oxide (TGO) and modified Fe sub(3)O sub(4) nanoparticles. For comparison, Fe sub(3)O sub(4)reduced graphene oxide (RGO) hybrid and its PS composites were also prepared. The morphologies of Fe sub(3)O sub(4)GO hybrid and Fe sub(3)O sub(4) nanoparticles were studied in terms of microstructure and magnetic properties. Surface modification of Fe sub(3)O sub(4) nanoparticles enhances their compatibility with PS and thus their uniform dispersion in the PS matrix. Much higher electrical conductivity and EMI shielding effectiveness are achieved for PS/. TGO/Fe sub(3)O sub(4) composites in comparison to those of PS/Fe sub(3)O sub(4)GO composites. Interestingly, PS/TGO/Fe sub(3)O sub(4) composites exhibit obviously improved EMI shielding effectiveness in relative to that of PS/TGO composite although their electrical conductivities are similar. The EMI shielding effectiveness of PS/TGO/Fe sub(3)O sub(4) composite is more than 30 dB in the frequency range of 9.8-12 GHz with only 2.24% of graphene. The effect of Fe sub(3)O sub(4) size on the composite properties is investigated and the EMI shielding mechanism is discussed.