Optimizing the Electromagnetic Wave Absorption Performances of Designed Co3Fe7@C Yolk-Shell Structures
Optimizing the Electromagnetic Wave Absorption Performances of Designed Co3Fe7@C Yolk-Shell Structures
复制标题
优化设计的Co3Fe7@C蛋黄壳结构的电磁波吸收性能
DOI：
10.1021/acsami.8b08040
复制
发表时间：
2018-08-29
影响因子：
9.5
通讯作者：
Xie, Zhaoxiong
中科院分区：
文献类型：
--
作者：
Li, Hao;Bao, Susu;Xie, Zhaoxiong
随着军事和商业应用需求的不断增长，磁性金属核壳结构在电磁波吸收材料领域引起了广泛的关注。为了进一步提高材料的综合性能，本文设计了一种以（Co0.9Fe0.1）Fe2O4 @酚醛树脂核@壳结构为前驱体制备Co3Fe7@C核壳结构的有效方法。可以通过控制反应条件来定制包括CoFe合金核的尺寸、碳壳的厚度以及核与壳之间的空隙的结构参数。结果表明，Co3Fe7@C蛋黄壳结构的电磁波吸收性能与其结构参数密切相关。优化后的Co3Fe7@C蛋黄壳结构具有良好的电磁波吸收性能，在9.1 GHz处最大反射损耗（RL）达到-35.3 dB，匹配厚度为2.0 mm，有效带宽（RL < -10 dB）可达8.4 GHz（9.6-18 GHz），厚度仅为1.5 mm，其优异的性能源于独特的蛋黄-壳层结构以及介电损耗和磁损耗之间的互补性和协同作用。通过合理的设计，磁性金属合金@碳蛋黄壳结构具有重量轻、厚度小、吸收频率宽、稳定性高、吸波能力强等特点，有望成为新型高效电磁波吸收材料。
Due to the increasing demand for military and commercial applications, magnetic metal-based core@shell nanostructures have attracted extensive attention in the field of electromagnetic wave (EMW) absorption materials. To further improve the overall performance, herein, an effective strategy is designed to fabricate Co3Fe7@C yolk-shell structures by using (Co0.9Fe0.1)Fe2O4@phenolic resin core@shell structures as precursors. The structure parameters, including the size of the CoFe alloy cores, the thickness of the carbon shell, and the void between the core and the shell, can be tailored by controlling the reaction conditions. It is demonstrated that the EMW absorption properties of the as-prepared Co3Fe7@C yolk-shell structures are closely related to their structure parameters. The optimized Co3Fe7@C yolk-shell structure shows excellent EMW absorption performance, the strongest reflection loss (RL) is up to -35.3 dB at 9.1 GHz with the matching thickness of 2.0 mm, and the effective bandwidth (RL < -10 dB) can reach 8.4 GHz (9.6-18 GHz) with a thickness of only 1.5 mm. It is revealed that the excellent performances stem from the unique yolk-shell structure as well as the complementarities and synergies between the dielectric loss and the magnetic loss. By rational designing, the magnetic metal alloy@carbon yolk-shell structures will be convinced to have the potential as novel high-efficiency EMW absorption materials with lightweight, low thickness, wide absorption frequency, high stability, and strong absorption characteristics.