文献类型：期刊文献

英文题名：Competitively Assembled Aramid-MXene Janus Aerogel Film Exhibiting Concurrently Robust Shielding and Effective Anti-Reflection Performance

作者：Xu, Jian[1];Fang, Jiangyu[1];Zuo, Peiyuan[1];Wang, Yizhe[1,2];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[2]Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Qinghai, Peoples R China

年份：2024

卷号：34

期号：34

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20241015704980);WOS:【SCI-EXPANDED(收录号:WOS:001180237800001)】；

基金：This work was supported by the National Natural Science Foundation of China (52373073, 52073091, 52303083, 22171086) and the Shanghai Pujiang Program (22PJ1402500).

语种：英文

外文关键词：anti-reflection; EMI shielding; gradient structure; Janus; MXene

摘要：The fast progress in electronic devices demands superior anti-reflective performance of electromagnetic interference shielding materials. However, high-performance shielding strategies are mainly dependent on reflection effects and this inevitably results in a trade-off between shielding and anti-reflective properties during structural designs. Herein, this work proposes a novel gradual heterogeneity design to fundamentally overcome the contradiction. The different steric hindrances in MXene nanosheets and aramid nanoclusters endow the competitively assembled laminal aerogel films with a unique Janus architecture. This Janus structure presents continuous gradient asymmetries and abundant cavities that enable prolonged energy attenuation paths and minimized reflection. Comparing to isotropic counterparts, the gradient design performances a 2174% reduction in reflection coefficient (0.0039) and a 53% increase in shielding efficiency (60.49 dB) in the terahertz band, both of which significantly outperform most state-of-the-art anti-reflective shielding structures. Moreover, the Janus architecture comprising interconnected arch-shaped substructures provides the aerogel films with anisotropic EMI and thermal management capabilities, coupled with robust structural and performance stability. This work provides a conceptually novel platform for developing asymmetric architecture for advanced shielding materials. Aramid-MXene Janus aerogel films, with gradual heterogeneous conductive networks, are synthesized by a competitive assembly method. The asymmetric structure engineering strategy innovatively reconstructs the impedance matching interface and electromagnetic wave attenuation paths, therefore fundamentally suppressing the reflection of radiation. Accordingly, the resultant Janus structures exhibit robust shielding efficiency, anti-reflection performance and outstanding stability, surpassing most of isotropic structures. image