Enhanced electromagnetic wave absorption of Fe-doped silicon oxycarbide nanocomposites
Enhanced electromagnetic wave absorption of Fe-doped silicon oxycarbide nanocomposites
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Fe掺杂碳氧化硅纳米复合材料增强电磁波吸收
DOI：
10.1111/jace.16848
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发表时间：
2020
影响因子：
3.9
通讯作者：
Shui Anze
中科院分区：
文献类型：
--
作者：
Du Bin;Qian Junjie;Hu Ping;He Chao;Cai Mei;Wang Xuan;Shui Anze
SiOC、SiCN、SiBCN和SiC等聚合物衍生陶瓷（PDCs）具有结构可控、原子级元素组成均匀、电磁和电化学性能可调等优点，被认为是设计高性能微波吸收体的最佳候选材料。本文采用溶剂热法成功制备了Fe离子掺杂的碳氧化硅（Fe ions-SiOC）陶瓷。复合材料的吸波性能与铁离子含量有关.铁离子有效地提高了非晶SiOC的界面极化，和纳米复合材料的介电性能，但几乎没有影响纳米复合材料的磁性。对于1450°C退火的0.16 mol/L-SiOC陶瓷，在厚度为4.55 mm时，有效吸收带宽高达2.00 GHz，在5.40 GHz时反射损耗为−59.60 dB。这些工作开辟了一条新颖而简单的路线，以扩大具有宽带和优异微波吸收性能的PDC基材料。
Polymer‐derived ceramics (PDCs), such as SiOC, SiCN, SiBCN, and SiC are considered the best candidates for designing high‐performance microwave absorber due to their controllable structure, homogeneous element composition at atom level, tunable electromagnetic and electrochemical properties. Herein, Fe ions doped silicon oxycarbide (Fe ions‐SiOC) ceramics have been successfully fabricatedviasolvothermal method. The electromagnetic absorption performances of the nanocomposites prove to be controllableviatailoring Fe ion contents. The Fe ions effectively enhance both the interfacial polarization of amorphous SiOC, and the dielectric properties of the nanocomposites but barely effect magnetic properties of the nanocomposite. As for 0.16 mol/L‐SiOC ceramics annealed at 1450°C, the effective absorption bandwidth as high as 2.00 GHz and reflection loss of −59.60 dB at 5.40 GHz with the thickness of 4.55 mm are obtained. Such work opens up a novel and simple route to scale up the PDC‐based materials with broadband and excellent microwave absorbing performances.