High electromagnetic interference shielding effectiveness in MgO composites reinforced by aligned graphene platelets

作者：Wei Wang, Ruopeng Cui, Peng Zhang, Chunlei Wan, Wei Pan · 发表于：Journal of the American Ceramic Society · 年份：2020 · DOI：10.1111/jace.17667 · 被引用次数：16 · 研究领域：Electromagnetic wave absorption materials、Advanced Antenna and Metasurface Technologies

ABSTRACT Graphene has been considered as an excellent filler to reinforce ceramics with enhanced properties. However, the uniform dispersion and controlled orientation of graphene sheets in a ceramic matrix have become major challenges toward higher performance. In this paper, we prepared MgO matrix composites with parallel graphene layers through the intercalation of the precursor into expandable graphite. We obtained a high electromagnetic interference (EMI) shielding effectiveness of ~30 dB, due to the multiple reflections and absorptance of electromagnetic waves between the parallel graphene layers. The hardness and strength of the MgO composite were also increased by introducing parallel graphene layers. All these properties suggest that the graphene/MgO composite represents a promising electromagnetic shielding material.