Boron-graphene composite for efficient electromagnetic interference shielding with strong strength and near-zero thermal expansion

石墨烯 电磁屏蔽 材料科学 复合数 热膨胀 复合材料 电磁干扰 零(语言学) 干扰(通信) 纳米技术 物理 电子工程 电气工程 哲学 工程类 核物理学 频道(广播) 语言学
作者
Jie Li,Changsheng Xing,Jiaxu Shuang,Yunzhong Wu,Tong Zhang,Bin Liu,Yekang Guan,Jie Sheng,Q. Ren,Yongkang Wang,Lidong Wang,Weidong Fei
出处
期刊:Carbon [Elsevier]
卷期号:228: 119318-119318
标识
DOI:10.1016/j.carbon.2024.119318
摘要

The quest for the materials that boast efficient electromagnetic interference (EMI) shielding, strong strength and superb thermal dimensional stability is a burgeoning research area, particularly due to their critical applications in safeguarding sensitive circuits against microwave radiation, especially in the space environments. Graphene-based composites, leveraging the remarkable attributes of individual graphene nanosheets, emerge as prime contenders for fulfilling these sophisticated application requirements. In this study, we prepared boron-graphene composites via spark sintering, combining graphene sheets and boron nanoparticles. This method not only ensures high-performance outcomes but also remains cost-effective and suitable for large-scale production. Boron serves as a binder, facilitating the connection between adjacent graphene sheets and enhancing the graphitization process. The resulting composites demonstrated exceptional electrical conductivity (4.53 × 105 S·m-1) and superior EMI shielding effectiveness (average SET 83 dB, with the thickness of 0.25 mm), markedly surpassing previous graphene-based materials in terms of compressive strength (171.3 MPa), and exhibiting low thermal expansion and an ultra-low friction coefficient (0.04). Additionally, to unravel the evolution of boron in the graphene composite and the impact of boron on electrical conductivity, first principles calculations and density functional theory (DFT) were utilized. This investigation underscores the significant promise of boron-graphene composites as high-performance, multifunctional materials across various domains.
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