Lin Haojian, Wang Ximiao, Zhu Hongjia, Cao Zhaolong, Wu Jiahao, Zhan Runze, Xu Ningsheng, Deng Shaozhi, Chen Huanjun, Liu Fei
State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, 510275, China.
Nat Commun. 2025 Jul 1;16(1):5739. doi: 10.1038/s41467-025-60892-1.
Materials with electromagnetic interference (EMI) shielding in the terahertz (THz) regime, while minimizing the quantity used, are highly demanded for future information communication, healthcare, and mineral resource exploration applications. Currently, there is often a trade-off between the amount of material used and the absolute EMI shielding effectiveness (EES) for the EMI shielding materials. Here, we address this trade-off by harnessing the unique properties of two-dimensional (2D) β-borophene (β-Br) nanosheets. By leveraging the high electron mobility and low mass density of β-Br, we simultaneously achieve a THz EMI shield effectiveness (SE) of 70 dB and an EES of 4.8 × 10dB·cm/g (@0.87 THz) using a β-Br polymer composite. This surpasses the values of previously reported THz shielding materials with an EES less than 3 × 10dB·cm/g and a SE smaller than 60 dB, while only needs 0.1 wt.% of these materials to realize the same SE value. Furthermore, by capitalizing on the superior mechanical properties of the composite, with 158% tensile strain at a Young's modulus of 21 MPa, we demonstrate the high-efficiency shielding performances of conformably coated surfaces based on β-Br nanosheets, suggesting their great potential in EMI shielding area.
在太赫兹（THz）波段具有电磁干扰（EMI）屏蔽功能且用量最少的材料，对于未来的信息通信、医疗保健和矿产资源勘探应用来说需求极大。目前，EMI屏蔽材料的用量与绝对EMI屏蔽效能（EES）之间往往存在权衡。在此，我们利用二维（2D）β-硼烯（β-Br）纳米片的独特性质来解决这一权衡问题。通过利用β-Br的高电子迁移率和低质量密度，我们使用β-Br聚合物复合材料同时实现了70 dB的太赫兹EMI屏蔽效能（SE）和4.8×10 dB·cm/g（@0.87 THz）的EES。这超过了先前报道的EES小于3×10 dB·cm/g且SE小于60 dB的太赫兹屏蔽材料的值，同时仅需0.1 wt.%的这些材料就能实现相同的SE值。此外，通过利用该复合材料的优异机械性能，其杨氏模量为21 MPa时拉伸应变为158%，我们展示了基于β-Br纳米片的贴合涂层表面的高效屏蔽性能，表明它们在EMI屏蔽领域具有巨大潜力。
