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Enhanced electromagnetic interference shielding properties of silicon carbide composites with aligned graphene nanoplatelets

2018; Elsevier BV; Volume: 38; Issue: 16 Linguagem: Inglês

10.1016/j.jeurceramsoc.2018.07.050

1873-619X

Chen Chen, Yongqiang Tan, Xiaochun Han, Heng Luo, Sifan Zeng, Shuming Peng, Haibin Zhang,

Aluminum Alloys Composites Properties

Graphene nanoplatelets (GNPs) were successfully incorporated into silicon carbide (SiC) ceramic matrix in a self-aligned pattern and the obtained materials displayed extremely high value of shielding effectiveness (SE) over 40 dB by adding only 3 wt.% GNPs, which was the highest SE value in all SiC-based composites reported in literature up to now. It was found that the texture distribution of GNPs was crucial to achieve the high electromagnetic interference shielding performance of SiC/GNPs composites, which can contribute to the significant improvement of both absorption and reflection. The improved absorption originated from the formation of network of mini capacitors comprised of self-aligned GNPs and multiple reflections. The improvement of reflection was attributed to the high electrical conductivity of the composite due to the introduction of GNPs. These results indicate that SiC/GNPs composites can be used as high-performance ceramic-based EMI shielding materials.