Controlled reduction synthesis of yolk-shell magnetic@void@C for electromagnetic wave absorption
Controlled reduction synthesis of yolk-shell magnetic@void@C for electromagnetic wave absorption
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DOI：
10.1016/j.cej.2020.124149
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发表时间：
2020-05-01
影响因子：
15.1
通讯作者：
Li, Hanxu
中科院分区：
文献类型：
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作者：
Gao, Shengtao;Zhang, Yuanchun;Li, Hanxu
开发千兆赫宽带高效电磁波吸收材料非常关键且具有挑战性。在这里，成功获得了典型的磁性碳复合材料，该复合材料涉及在还原气氛下从半导体到磁性材料的受控还原过程。由于晶格常数的巨大差异，由核壳a-Fe2O3@PDA前驱体开发了蛋黄壳Fe3O4@C和Fe@void@C粉末。对最终的magic@void@C粉末的化学成分、磁性能和形貌进行了全面讨论。测试了所有样品的相关电磁参数，分析其对电磁波能量的存储和损耗能力。令人鼓舞的是，Fe3O4@C 和 Fe@void@C 复合材料在微波波段表现出高性能的能量吸收。当吸收体厚度仅为 1.5 mm 时，Fe3O4@C 的最小反射损耗 (RLmin) 值为 -45.4 dB，有效吸收 (RL
The development of broadband and high-efficiency electromagnetic wave absorbing materials in the gigahertz is highly crucial and challenging. Here, typical magnetic-carbon composites were successfully obtained, which involves a controlled reduction process from a semiconductor to magnetic materials under reducing atmosphere. Due to the huge difference in lattice constants, yolk-shell Fe3O4@C and Fe@void@C powders were developed from core-shell a-Fe2O3@PDA precursor. The chemical composition, magnetic property, and morphology of the final magnetic@void@C powders were discussed comprehensively. Related electromagnetic parameters of all samples were tested to analyze the storage and loss ability toward electromagnetic wave energy. Inspiringly, both the Fe3O4@C and Fe@void@C composites exhibited high-performance energy absorption in the microwave band. The minimal reflection loss (RLmin) value of Fe3O4@C is -45.4 dB at the absorber thickness only at 1.5 mm and the efficient absorption (RL