Sandwich -like Fe 3 O 4 /Fe 3 S 4 composites for electromagnetic wave absorption
Sandwich -like Fe 3 O 4 /Fe 3 S 4 composites for electromagnetic wave absorption
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电磁波吸收三明治状Fe 3 O 4 /Fe 3 S 4 复合材料
DOI：
10.1016/j.cej.2020.124743
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发表时间：
2020
影响因子：
15.1
通讯作者：
Zang Duyang
中科院分区：
文献类型：
--
作者：
Wu Hongjing;Liu Jiaolong;Liang Hongsheng;Zang Duyang
随着电磁装置的广泛应用，人们迫切需要性能优异的电磁波吸收剂。本文首次采用一种简单易行的方法制备了一系列六方片状Fe3O4/FeS2/Fe7S8复合材料（样品S1）和六方片状Fe3O4/Fe3S4复合材料（样品S3）。通过在水热过程中添加硫脲和D-葡萄糖，可以获得不同形貌、晶体结构和电磁波吸收性能的复合材料。其中，Fe_3O_4/Fe_3S_4复合材料（样品S_3）由于阻抗匹配和介电/磁损耗的有效结合，具有优异的电磁波吸收性能。也就是说，对于具有60wt%负载的样品S3，在3.30 mm的匹配厚度下实现了-45.33 dB的最小反射损耗（RLmin）以及在2.00 mm下实现了5.03 GHz的EAB。值得注意的是，对于具有70wt%负载的复合材料，其在仅1.71 mm处表现出5.18 GHz的宽EAB。令人印象深刻的是，即使在1.46 mm的超薄厚度下，EAB仍然达到了4.39 GHz。因此，可以预见，类铁尖晶石结构的Fe3O4/Fe3S4复合材料将是一种很有吸引力的电磁波吸收材料。此外，应该强调的是，关于铁硫化合物的EMW吸收性能的报道（例如，Fe_3S_4、FeS_2和Fe_7S_8）的研究还非常缺乏，因此，我们的研究结果为今后设计高性能电磁波吸收剂提供了一个独特的前景。
The outstanding electromagnetic wave (EMW) absorbers are highly needed in view of the extensive utilization of electromagnetic devices. Herein, for the first time, a series of hexagonal microflake-like Fe3O4/FeS2/Fe7S8composites (sample S1) and sandwich-like Fe3O4/Fe3S4composites (sample S3) were effectively prepared through a facile and highly tunable strategy. By the means of tailoring addition of thiourea and D-glucose in the hydrothermal process, the different morphologies, crystal structures and EMW absorption performances of composites could be attained. Among these absorbers, owing to the effective combination of matched impedance and excellent dielectric/magnetic loss, the sandwich-like Fe3O4/Fe3S4composites (sample S3) possessed excellent EWM absorption performance. That is, the minimum reflection loss (RLmin) of −45.33 dB at the matched thickness of 3.30 mm as well as the EAB of 5.03 GHz at 2.00 mm were achieved for sample S3 with 60 wt% loading. Noteworthy, as for the composites with 70 wt% loading, it exhibited broad EAB of 5.18 GHz at only 1.71 mm. Impressively, the EAB still reached 4.39 GHz even at the ultra-thin thickness of 1.46 mm. Therefore, it can be predictable that the sandwich-like Fe3O4/Fe3S4composites will be a powerful attractive EMW absorber. Besides, it should be emphasized that the reports on the EMW absorption performance of iron sulfur compounds (e.g., Fe3S4, FeS2and Fe7S8) are extremely scanty so far, so our finding featured with a facile, green and greatly tunable strategy provides a unique horizon to design the high-performance EMW absorbers in the future.