材料科学
纳米颗粒
反射损耗
电介质
微波食品加热
电容感应
光电子学
吸收(声学)
介电常数
电磁辐射
极化(电化学)
电容
纳米技术
复合材料
光学
电极
复合数
电气工程
化学
物理
物理化学
量子力学
工程类
作者
Hongsheng Li,Song Gao,Hanxiang Tong,Yanling Liu,Aimin Wu,Hao Huang
标识
DOI:10.1016/j.cej.2022.134655
摘要
Developing the excellent electromagnetic (EM) wave absorption materials with the characteristics of "Thin, Light, Wide, Strong" to mitigate EM wave pollution is still a huge challenge. In this work, a series of [email protected]@C double-shell nanoparticles were synthesized by preparation technology of thermal arc plasma nanoparticle. The thickness of the shell layer is regulated by modulating the concentration of methane (CH4) to increase the interfacial polarization sites and further improve the dielectric and EM wave absorption properties in the full wave band (0.1–18 GHz). Surprisingly, the EM wave absorption property is improved as the CH4 concentration increases. It is discovered that the effect of core Ni, dielectric material SiC and graphite C essentially increases the polarization source in the nanoparticles, resulting in outstanding complex permittivity and high reflection loss. Meanwhile, [email protected]@C double shell structure is equivalent to capacitance Cp and resistor Rp, as parallel circuit to manufacture interfacial polarization. This study provides a vivid picture of how a new absorbing material worked. More broadly, it can demonstrate that double shell structure is the effective ways to dramatically enhance potential in the application of absorbing devices.
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