Yang Guo-Yu, Wang Shao-Zhe, Sun Hong-Tai, Yao Xu-Ming, Li Chuan-Bing, Li Yu-Jun, Jiang Jian-Jun
Shaanxi Engineering Research Center for Digital Manufacturing Technology, Northwestern Polytechnical University, Xi'an 710072, P. R. China.
School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen 518172, P. R. China.
ACS Appl Mater Interfaces. 2021 Dec 8;13(48):57521-57531. doi: 10.1021/acsami.1c13303. Epub 2021 Nov 18.
MXene aerogels with a porous microstructure are a promising electromagnetic interference (EMI) shielding material due to its low density and excellent electrical conductivity, which has attracted widespread attention. Compared with traditional EMI shielding materials that rely on reflection as the primary mechanism, MXene aerogels with absorption as the dominant mechanism have greater potential for development as a novel EMI shielding material because of its ability to reduce environmental contamination from reflected electromagnetic (EM) waves from materials. In this study, a novel TiCT MXene/PEDOT:PSS hybrid aerogel was presented by freeze-drying and thermal annealing using few-layered TiCT MXene and the conductive polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). PEDOT:PSS not only improved the gelling ability of TiCT but also successfully established a conductive bridge between MXene nanosheets. The experimental results demonstrated that the hybrid aerogel exhibited an obvious porous microstructure, which was beneficial for the multiple scattering of EM waves within the materials. The EMI shielding effectiveness and specific shielding effectiveness reached up to 59 dB and 10,841 dB·cm·g, respectively, while the SE/SE ratio value was only 0.05, indicating superior wave absorption performance. Furthermore, the good impedance matching, due to the electrical conductance loss and polarization loss effect of the composites, plays a critical role in their excellent wave absorption and EMI shielding performance. Therefore, this work provides a practical approach for designing and fabricating lightweight absorption-dominated EMI shielding materials.
具有多孔微观结构的MXene气凝胶由于其低密度和优异的导电性，是一种很有前途的电磁干扰（EMI）屏蔽材料，已引起广泛关注。与以反射为主要机制的传统EMI屏蔽材料相比，以吸收为主要机制的MXene气凝胶作为一种新型EMI屏蔽材料具有更大的发展潜力，因为它能够减少材料反射的电磁（EM）波对环境污染。在本研究中，通过冷冻干燥和热退火，使用少层TiCT MXene和导电聚合物聚（3,4-乙撑二氧噻吩）-聚（苯乙烯磺酸盐）（PEDOT:PSS）制备了一种新型TiCT MXene/PEDOT:PSS混合气凝胶。PEDOT:PSS不仅提高了TiCT的胶凝能力，还成功地在MXene纳米片之间建立了导电桥。实验结果表明，该混合气凝胶呈现出明显的多孔微观结构，有利于EM波在材料内部的多次散射。EMI屏蔽效能和比屏蔽效能分别达到59 dB和10841 dB·cm·g，而SE/SE比值仅为0.05，表明其具有优异的吸波性能。此外，由于复合材料的电导损耗和极化损耗效应，良好的阻抗匹配在其优异的吸波和EMI屏蔽性能中起着关键作用。因此，这项工作为设计和制造以吸收为主的轻质EMI屏蔽材料提供了一种实用方法。
