Regulation mechanism of negative permittivity in percolating composites via building blocks
Regulation mechanism of negative permittivity in percolating composites via building blocks
复制标题
通过积木渗透复合材料负介电常数的调节机制
DOI：
10.1063/1.4994234
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发表时间：
2017-09
影响因子：
4
通讯作者：
Fan Runhua
中科院分区：
文献类型：
--
作者：
Xie Peitao;Wang Zhongyang;Sun Kai;Cheng Chuanbing;Liu Yao;Fan Runhua
具有负介电常数的渗透复合材料可能是超材料的有希望的候选者；然而，负介电常数的构建模块尚未在渗透复合材料中提出。在此，研究了分散在聚合物基体中的 Fe 和 SiO2 涂层 Fe 颗粒三元复合材料的介电性能，其介电性能在 10MHz–1GHz 范围内进行了研究。通过逐渐控制Fe/涂层Fe比率(x)，当x超过0.75时，可以构建三维导电网络。德鲁德型负介电常数是通过导电网络实现的，其洛伦兹型色散主要归因于包覆铁颗粒的介电共振。等效电路分析表明，感应导电网络是实现负介电常数的决定性组成部分。此外，由涂层铁颗粒引起的介电共振是LC共振，这表明电容隔离金属颗粒充当了另一个构建块来控制...
Percolating composites with negative permittivity can be promising candidates for metamaterials; however, building blocks of negative permittivity have not yet been put forward in percolating composites. Here, the dielectric properties of a ternary composite with Fe and SiO2-coated Fe particles dispersed in a polymer matrix were investigated in the range of 10 MHz–1 GHz. By gradually controlling the Fe/coated-Fe ratio (x), a three-dimensional conductive network could be constructed when x exceeds 0.75. The Drude-type negative permittivity was achieved by the conductive network, and its Lorentz-type dispersion was mainly attributed to dielectric resonance of coated-Fe particles. Equivalent circuit analysis demonstrated that the inductive conductive network was the decisive building block to achieve negative permittivity. Moreover, the dielectric resonance caused by coated-Fe particles was LC resonance, and this indicated that the capacitive isolated metallic particles acted as another building block to con...
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影响因子：
6.2
作者：
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通讯作者：
Schumacher Gerhard
影响因子：
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影响因子：
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影响因子：
13.3
作者：
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