Wang Yang, Yang Jian, Chen Zhaofeng, Hu Yunlong
College of Materials Science and Engineering, Nanjing Tech University Nanjing 210009 China
Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University Nanjing 210009 China.
RSC Adv. 2019 Dec 12;9(70):41038-41049. doi: 10.1039/c9ra09817h. eCollection 2019 Dec 9.
A new ultralight carbon foam/TiCT (CF/MXene) electromagnetic (EM) absorbing hybrid with three-dimensional network structure was fabricated by vacuum impregnation and freeze-drying process. These hybrids display excellent flexibility and steady compression-resilience properties and also the special three-dimensional structure with ultralow density of only 5-7 mg cm shows higher EM absorption than most foam-based EM absorbers. Studies have shown that the minimum reflection loss of CF/MXene-N2 reaches -45 dB at 8.8 GHz with the TiCT nanosheets content of 9.8%. In the meanwhile, the effective absorption bandwidth of CF/MXene-N2 can also reach up to 5 GHz (from 6.9 GHz to 11.9 GHz) with the thickness of 4.5 mm. Moreover, the fundamental EM absorption mechanism of CF/MXene hybrids involved to impedance matching, conductive loss and polarization loss is carefully analyzed. Thus, it is expected that the new ultralight carbon foam/TiCT hybrids with three-dimensional network structure will have great application prospects in the fields of EM absorption.
通过真空浸渍和冷冻干燥工艺制备了一种新型的具有三维网络结构的超轻碳泡沫/TiCT（CF/MXene）电磁吸收复合材料。这些复合材料具有优异的柔韧性和稳定的压缩回弹性能，其特殊的三维结构密度超低，仅为5-7 mg/cm³，比大多数泡沫基电磁吸收体具有更高的电磁吸收性能。研究表明，当TiCT纳米片含量为9.8%时，CF/MXene-N2在8.8 GHz处的最小反射损耗达到-45 dB。同时，CF/MXene-N2在厚度为4.5 mm时的有效吸收带宽也可达5 GHz（从6.9 GHz到11.9 GHz）。此外，还仔细分析了CF/MXene复合材料的基本电磁吸收机制，包括阻抗匹配、传导损耗和极化损耗。因此，预计这种具有三维网络结构的新型超轻碳泡沫/TiCT复合材料在电磁吸收领域将具有广阔的应用前景。
