Jin Chen, Wu Zhengchen, Zhang Ruixuan, Qian Xiang, Xu Hualong, Che Renchao
Laboratory of Advanced Materials, Department of Materials Science and Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, P. R. China.
Department of Chemistry, Fudan University, Shanghai 200438, P. R. China.
ACS Appl Mater Interfaces. 2021 Apr 7;13(13):15939-15949. doi: 10.1021/acsami.1c03129. Epub 2021 Mar 29.
1D structures have been gaining traction in the microwave absorption (MA) field benefiting from their electromagnetic (EM) anisotropy. However, there remain considerable challenges in adjusting EM properties by structural design. Herein, using the coaxial electrospinning and solvothermal method, the EM gradient has been achieved in TiO@Co/C@Co/Ni multilayered microtubes. From the outer layer to the inner one, the impedance matching is gradually worsened, while the EM loss capacity is continuously enhanced, facilitating both the incidence and attenuation of microwave. Besides, 1D structural anisotropy simultaneously realizes multilevel magnetic interaction and 3D conductive double network. Therefore, the 1D EM-gradient hierarchical TiO@Co/C@Co/Ni carbon microtube composite exhibits excellent MA performance. Its maximum reflection loss (RL) value reaches -53.99 dB at 2.0 mm and effective absorption bandwidth (EAB, RL ≤ -10 dB) is as wide as 6.0 GHz, covering most of the Ku band with only 15% filling. The unique design of 1D EM-gradient hierarchical composites promises great potential in the construction of advanced MA materials.
一维结构因其电磁各向异性在微波吸收（MA）领域受到越来越多的关注。然而，通过结构设计来调节电磁特性仍然面临着巨大的挑战。在此，采用同轴静电纺丝和溶剂热法，在TiO@Co/C@Co/Ni多层微管中实现了电磁梯度。从外层到内层，阻抗匹配逐渐变差，而电磁损耗能力不断增强，有利于微波的入射和衰减。此外，一维结构各向异性同时实现了多级磁相互作用和三维导电双网络。因此，一维电磁梯度分级TiO@Co/C@Co/Ni碳微管复合材料表现出优异的微波吸收性能。其最大反射损耗（RL）值在2.0 mm处达到-53.99 dB，有效吸收带宽（EAB，RL≤-10 dB）宽达6.0 GHz，仅15%的填充率就覆盖了大部分Ku波段。一维电磁梯度分级复合材料的独特设计在先进微波吸收材料的构建中具有巨大潜力。
