A cauliflower-shaped nickel @ porous calcium silicate core-shell composite: Preparation and enhanced electromagnetic shielding performance
A cauliflower-shaped nickel @ porous calcium silicate core-shell composite: Preparation and enhanced electromagnetic shielding performance
复制标题
DOI：
10.1016/j.compscitech.2020.108343
复制
发表时间：
2020-07
影响因子：
9.1
通讯作者：
Xiaomei Wu;Bianying Wen
中科院分区：
文献类型：
--
作者：
Xiaomei Wu;Bianying Wen
在无机多孔材料表面改性磁性金属，不仅可以赋予无机绝缘材料导电和磁性能力，还可以充分利用多孔材料丰富的多孔结构，在电磁波入射时吸收和消耗电磁能。采用化学镀法制备了具有核壳结构的菜花状镀镍多孔硅酸钙（Ni@PCS）功能复合材料。研究了Ni@PCS的电磁屏蔽性能，并探讨了相应的电磁屏蔽机理。结果表明，所制备的Ni@PCS在X波段具有58.1dB的电磁屏蔽效能，样品厚度仅为0.9mm。多重能量耗散的协同效应是该核壳复合材料的主要电磁屏蔽机理。镍壳具有优良的导电性和导磁性，负责大部分反射损耗和磁损耗; PCS芯和镍壳之间的界面产生界面极化损耗，而菜花状多孔结构提供内部多次反射损耗。在无机多孔材料表面包覆磁性金属是制备高性能电磁屏蔽复合材料的有效途径。
Modifying magnetic metals on the surface of inorganic porous materials can not only impart conductive and magnetic ability to inorganic insulating materials, but also make full use of the rich porous structure of porous materials to absorb and consume electromagnetic energy when electromagnetic waves are incident. In this work, a cauliflower-shaped nickel-plated porous calcium silicate (Ni@PCS) functional composite with core-shell structure was successfully fabricated via electroless plating. The electromagnetic shielding performance of the prepared Ni@PCS was investigated and the corresponding electromagnetic shielding mechanism was discussed. Results indicate that the prepared Ni@PCS achieves excellent electromagnetic shielding effectiveness of 58.1 dB at X band with only 0.9 mm of sample thickness. The synergistic effect of multiple energy dissipation is the main electromagnetic shielding mechanism of this core-shell composite. The nickel shell with excellent electrical and magnetic conductivity is responsible for most of the reflection loss and magnetic loss; the interface between the PCS core and the nickel shell produces interfacial polarization loss, while the cauliflower-shaped porous structure provides the internal multiple reflection loss. The results also illustrate that coating magnetic metals on the surface of inorganic porous materials is an effective strategy to prepare high-performance electromagnetic shielding composite materials.