Xu Chunyang, Liu Panbo, Wu Zhengchen, Zhang Huibin, Zhang Ruixuan, Zhang Chang, Wang Lei, Wang Longyuan, Yang Bingtong, Yang Ziqi, You Wenbin, Che Renchao
Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Department of Materials Science, Fudan University, Shanghai, 200438, P. R. China.
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, 710129, P. R. China.
Adv Sci (Weinh). 2022 Jun;9(17):e2200804. doi: 10.1002/advs.202200804. Epub 2022 Apr 11.
Heterointerface engineering is evolving as an effective approach to tune electromagnetic functional materials, but the mechanisms of heterointerfaces on microwave absorption (MA) remain unclear. In this work, abundant electromagnetic heterointerfaces are customized in multilevel hollow architecture via a one-step synergistic polymerizing-etching strategy. Fe/Fe O @C spindle-on-tube structures are transformed from FeOOH@polydopamine precursors by a controllable reduction process. The impressive electromagnetic heterostructures are realized on the Fe/Fe O @C hollow spindle arrays and induce strong interfacial polarization. The highly dispersive Fe/Fe O nanoparticles within spindles build multi-dimension magnetic networks, which enhance the interaction with incident microwaves and reinforce magnetic loss capacity. Moreover, the hierarchically hollow structure and electromagnetic synergistic components are conducive to the impedance matching between absorbing materials and air medium. Furthermore, the mechanisms of electromagnetic heterointerfaces on the MA are systematically investigated. Accordingly, the as-prepared hierarchical Fe/Fe O @C microtubes exhibit remarkable MA performance with a maximum refection loss of -55.4 dB and an absorption bandwidth of 4.2 GHz. Therefore, in this study, the authors not only demonstrate a synergistic strategy to design multilevel hollow architecture, but also provide a fundamental guide in heterointerface engineering of highly efficient electromagnetic functional materials.
异质界面工程正在发展成为一种调节电磁功能材料的有效方法，但异质界面在微波吸收（MA）方面的机制仍不清楚。在这项工作中，通过一步协同聚合蚀刻策略在多级空心结构中定制了丰富的电磁异质界面。Fe/Fe₃O₄@C管上纺锤体结构通过可控还原过程由FeOOH@聚多巴胺前驱体转化而来。在Fe/Fe₃O₄@C空心纺锤体阵列上实现了令人印象深刻的电磁异质结构，并诱导出强烈的界面极化。纺锤体内高度分散的Fe/Fe₃O₄纳米颗粒构建了多维磁网络，增强了与入射微波的相互作用并增强了磁损耗能力。此外，分层空心结构和电磁协同组件有利于吸收材料与空气介质之间的阻抗匹配。此外，系统地研究了电磁异质界面在微波吸收方面的机制。因此，所制备的分级Fe/Fe₃O₄@C微管表现出卓越的微波吸收性能，最大反射损耗为-55.4 dB，吸收带宽为4.2 GHz。因此，在本研究中，作者不仅展示了一种设计多级空心结构的协同策略，还为高效电磁功能材料的异质界面工程提供了基本指导。
