Synthesis and Microwave Absorption Enhancement of CoNi@SiO2@C Hierarchical Structures
Synthesis and Microwave Absorption Enhancement of CoNi@SiO2@C Hierarchical Structures
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CoNi@SiO2@C多级结构的合成及微波吸收增强
DOI：
10.1021/acs.iecr.8b00997
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发表时间：
2018-04
影响因子：
4.2
通讯作者：
Feng Xuansheng
中科院分区：
文献类型：
--
作者：
Zhou Suhua;Huang Ying;Liu Xudong;Yan Jing;Feng Xuansheng
通过合理的工艺制备了一系列CoNi@SiO2@C复合材料，并通过调节酚醛树脂前驱体的添加量来调节碳含量。采用XRD、SEM、XPS、VSM等手段对产物的组成、微观结构和磁性能进行了详细的表征。结果表明，海胆状CoNi合金颗粒表面依次包覆了SiO2和碳涂层。对微波吸收性能的探索表明，含有50wt%CoNi@SiO2@C-3的蜡基混合物具有改善的吸收能力，在10.8 GHz处具有最大RL值为-46.0 dB，有效吸收带宽为5.6 GHz（从7.1到12.7 GHz）。此外，随着层厚度从1.5到5 mm变化，有效吸收带宽几乎与整个C、X和Ku波段重叠。卓越的微波吸收性能。
A series of hierarchical CoNi@SiO2@C composites were successfully fabricated through a workable procedure, and the content of carbon can be adjusted by modulating the additive dose of phenolic resin precursors. The compositions, microstructures, and magnetic characters of the obtained products were characterized in detail via XRD, SEM, XPS, and VSM detailedly. The results manifested that the urchin-like CoNi alloy particles were successively encapsulated with SiO2 and carbon coatings. The exploration into microwave absorbing performances demonstrated that wax-based hybrids containing 50 wt % CoNi@SiO2@C-3 are endowed with improved absorbing capability possessing the maximum RL value of −46.0 dB at 10.8 GHz with an effective absorption bandwidth of 5.6 GHz (from 7.1 to 12.7 GHz) for a layer thickness of only 2.2 mm. Moreover, in the wake of layer thicknesses varying from 1.5 to 5 mm, the effective absorbing bandwidth almost overlaps the whole C, X, and Ku wave bands. The remarkable microwave absorption per...
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