Liang Shuhui, Guan Huan, Zhang Hainan, Han Xiangge, Zhao Jiupeng, Dou Shuliang, Hao Sue, Zhou Haoxin, Geng Chenchen, Zhao Tao, Gu Jinxin, Wei Hang, Li Yao
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, China.
Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China.
ACS Appl Mater Interfaces. 2024 Apr 24;16(16):21024-21033. doi: 10.1021/acsami.3c19326. Epub 2024 Apr 12.
The unique metal-insulator transition of VO is very suitable for dynamic electromagnetic (EM) regulation materials due to its sharp change in electrical conductivity. Here, we have developed an off/on switchable electromagnetic interference (EMI) shielding composite by interconnecting VO nanowires (NWs) in poly(vinylidene fluoride--hexafluoropropylene) (PVDF-HFP) to form conductive networks, resulting in outstanding performance at the X and Ku bands with maximum change values of 44.8 and 59.4 dB, respectively. The unique insulator-to-metal transition (IMT) of VO NWs has dominated the variation of polarization loss (ε″) and conductivity loss (ε″) for the composites, which is the mechanism of EMI shielding switching between off and on states. Furthermore, the composite exhibits good cycling stability of the off/on switchable EMI shielding performance and has excellent mechanical properties, especially with 200 times abrasion resistance without obvious weight loss. This study provides a unique approach for dynamic switching of EM response with the potential to construct practical intelligent EM response systems for next-generation smart electromagnetic devices in various scenarios.
VO独特的金属-绝缘体转变因其电导率的急剧变化而非常适合用于动态电磁（EM）调节材料。在此，我们通过在聚（偏二氟乙烯-六氟丙烯）（PVDF-HFP）中互连VO纳米线（NWs）以形成导电网络，开发了一种开/关可切换电磁干扰（EMI）屏蔽复合材料，在X和Ku波段表现出优异性能，最大变化值分别为44.8 dB和59.4 dB。VO NWs独特的绝缘体-金属转变（IMT）主导了复合材料的极化损耗（ε″）和电导率损耗（σ″）的变化，这是EMI屏蔽在关态和开态之间切换的机制。此外，该复合材料在开/关可切换EMI屏蔽性能方面表现出良好的循环稳定性，并且具有优异的机械性能，特别是具有200次耐磨性能且无明显重量损失。本研究提供了一种独特的动态切换EM响应的方法，有潜力为各种场景中的下一代智能电磁设备构建实用的智能EM响应系统。
