Liu Heguang, Lei Fengyu, Xu Wanyin, Li Qianqian, Lei Chao, Xiong Chuanyin, Tian Na, You Caiyin, Yang Yang
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.
Materials Genome Institute, Shanghai University, Shanghai 200444, China.
ACS Nano. 2025 Jan 14;19(1):1198-1210. doi: 10.1021/acsnano.4c13329. Epub 2025 Jan 2.
Advanced electromagnetic interference (EMI) shielding materials are in great demand because of the severe electromagnetic population problem caused by the explosive growth of advanced electronics. Besides superior EMI shielding properties, the mechanical strength of the shielding materials is also critical for some specific application scenarios (e.g., shielding cases and shielding frames). Although most reported EMI shielding materials possess good shielding properties and lightweight characteristics, they usually exhibit a poor mechanical strength. Concurrently, multifunctionality is also essential for the application of the EMI shielding material. This study develops a molten-state-based in situ reduction strategy to fabricate an efficient EMI shielding composite, enabling the uniform dispersion of Co-nanoparticles on the carbon form matrix while featuring a high density of defects. This ensures the high mechanical strength of the composite due to the presence of a huge interface and significantly enhances the EMI shielding performance. The composite achieves an optimal shielding effectiveness of 32.6 dB and compressive strength of 38.31 MPa, respectively, improved by 65.4 and 123.4% compared to the pristine carbon foam. Simultaneously, the composite also exhibits desirable electrochemical and photothermal conversion properties. This research offers insights into the design of composites that excel in electromagnetic interference shielding, mechanical robustness, and multifunctionality.
由于先进电子产品的爆炸式增长导致严重的电磁污染问题，对先进电磁干扰（EMI）屏蔽材料的需求巨大。除了优异的EMI屏蔽性能外，屏蔽材料的机械强度对于某些特定应用场景（如屏蔽外壳和屏蔽框架）也至关重要。尽管大多数报道的EMI屏蔽材料具有良好的屏蔽性能和轻质特性，但它们通常表现出较差的机械强度。同时，多功能性对于EMI屏蔽材料的应用也至关重要。本研究开发了一种基于熔融态的原位还原策略，以制备一种高效的EMI屏蔽复合材料，使钴纳米颗粒均匀分散在碳泡沫基体上，同时具有高密度的缺陷。这确保了复合材料由于存在巨大的界面而具有高机械强度，并显著提高了EMI屏蔽性能。该复合材料的最佳屏蔽效能分别达到32.6 dB，抗压强度达到38.31 MPa，与原始碳泡沫相比分别提高了65.4%和123.4%。同时，该复合材料还表现出理想的电化学和光热转换性能。本研究为设计在电磁干扰屏蔽、机械坚固性和多功能性方面表现出色的复合材料提供了见解。
