Huang Li, Li Jianjun, Li Yibin, He Xiaodong, Yuan Ye
School of Materials Science and Technology, Research Institute for Energy Equipment Materials, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin, 300401, People's Republic of China.
Nanoscale. 2019 Apr 25;11(17):8616-8625. doi: 10.1039/c9nr02102g.
High-performance electromagnetic interference (EMI) shielding materials possess features of light weight, flexibility and excellent EMI shielding effectiveness. However, continuous efforts are still needed to satisfy the urgent demand for electromagnetic pollution shielding. In this study, a lightweight and flexible hybrid film with a multi-scale double-continuous conductive network (TiO2/SiO2@PPy) and sandwich structure (TiO2/SiO2@PPy@rGO) was prepared via a delicate structure design of electrospun TiO2/SiO2 nanofibers. The hybrid film worked as an effective dissipative medium, leading to a high EMI shielding effectiveness of approximately 30 dB in the X band (8-12 GHz) and excellent specific EMI shielding effectiveness (SE) of ∼13 829 dB cm2 g-1. The hybrid film has a tensile strength of 2.71 MPa, while its density is only 0.089 g cm-3. The hybrid films maintained good electrical and EMI shielding properties after repeated bending, indicating their favorable flexibility. The delicate structure-design strategy of the electrospun nanofibers presents a practicable way to prepare lightweight and flexible hybrid films for high-performance EMI shielding materials in flexible electronics, military and healthcare applications.
高性能电磁干扰（EMI）屏蔽材料具有重量轻、柔韧性好和优异的EMI屏蔽效能等特点。然而，为满足对电磁污染屏蔽的迫切需求，仍需不断努力。在本研究中，通过对静电纺丝TiO2/SiO2纳米纤维进行精细结构设计，制备了一种具有多尺度双连续导电网络（TiO2/SiO2@PPy）和三明治结构（TiO2/SiO2@PPy@rGO）的轻质柔性复合薄膜。该复合薄膜作为一种有效的耗散介质，在X波段（8-12 GHz）具有约30 dB的高EMI屏蔽效能和约13829 dB cm2 g-1的优异比EMI屏蔽效能（SE）。该复合薄膜的拉伸强度为2.71 MPa，而其密度仅为0.089 g cm-3。复合薄膜在反复弯曲后仍保持良好的电学和EMI屏蔽性能，表明其具有良好的柔韧性。静电纺丝纳米纤维的精细结构设计策略为在柔性电子、军事和医疗应用中制备用于高性能EMI屏蔽材料的轻质柔性复合薄膜提供了一种可行的方法。
