Three-dimensional foam-like Fe3O4@C core-shell nanocomposites: Controllable synthesis and wideband electromagnetic wave absorption properties
Three-dimensional foam-like Fe3O4@C core-shell nanocomposites: Controllable synthesis and wideband electromagnetic wave absorption properties
复制标题
三维泡沫状Fe3O4@C核壳纳米复合材料：可控合成及宽带电磁波吸收性能
DOI：
10.1016/j.jmmm.2020.166518
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发表时间：
2020-05-15
影响因子：
2.7
通讯作者：
Zhang, Zhidong
中科院分区：
文献类型：
--
作者：
Meng, Xun;Yang, Weiwei;Zhang, Zhidong
铁氧体和碳纳米复合材料因其兼容的介电和磁损耗性能而被认为是优良的电磁波吸收材料。本文成功地制备了具有泡沫状结构的三维(3D)Fe3O4@C核壳纳米复合材料，它将极大地促进入射微波的多次反射/散射。通过调节聚合物前驱体的量，可以很好地将外碳控制在9.1-34.8 nm的平均厚度范围内。同时，通过3D泡沫状Fe3O4核与外碳的协同作用，改善了纳米复合材料的阻抗匹配条件。此外，纳米复合材料的吸波性能与外层碳层厚度有很大的依赖关系。当外炭平均厚度为28.3 nm时，吸波材料的性能最好，当吸波材料厚度为2.5 mm时，最小反射损耗(RL)为-55.5分贝。特别是，当厚度从1.4 mm调整到5.5 mm时，Fe3O4@C表现出有效的吸收(RL
Ferrite and carbon nanocomposites are regarded to be excellent electromagnetic wave absorbers due to their compatible dielectric and magnetic loss capabilities. In this article, the three-dimensional (3D) Fe3O4@C coreshell nanocomposites with foam-like structure have been successfully prepared, which would greatly promote multiple reflection/scattering of the incident microwave. By adjusting the amount of polymeric precursors, the outer carbon can be perfectly controlled within the average thickness range of 9.1-34.8 nm. Meanwhile, through the synergy between 3D foam-like Fe3O4 core and outer carbon, the impedance matching conditions of the nanocomposites can be improved. Besides, the electromagnetic wave absorptivity of the nanocomposites presents a significant dependence on the thickness of outer carbon. When the average thickness of outer carbon is 28.3 nm, the absorber shows the most excellent performance, and the minimum reflection loss (RL) value is - 55.5 dB with 2.5 mm absorber thickness. Especially, when the thickness is tuned from 1.4 mm to 5.5 mm, the Fe3O4@C exhibits efficient absorption (RL