Negative permittivity and negative permeability of multi-walled carbon nanotubes/polypyrrole nanocomposites
Negative permittivity and negative permeability of multi-walled carbon nanotubes/polypyrrole nanocomposites
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DOI：
10.1016/j.orgel.2016.07.029
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发表时间：
2016-11-01
影响因子：
3.2
通讯作者：
Qiu, Jun
中科院分区：
文献类型：
--
作者：
Kou, Xuechen;Yao, Xiuchao;Qiu, Jun
采用原位聚合法合成了多壁碳纳米管（MWCNTs）/聚吡咯（PPy）纳米复合粒子。不同MWCNTs含量的MWCNTs/PPy纳米复合材料同时出现负介电常数和负磁导率。SEM分析发现，MWCNTs/PPy纳米复合材料颗粒中随机填充了大量的微孔，并在微孔周围形成了大量的导电环，部分MWCNTs可以穿过微孔，增加导电环的数量。同时，MWCNTs/PPy复合材料中的MWCNTs本身也形成了许多导电网络。负介电常数行为源于导电网络中离域电子的等离子体振荡，负磁导率归因于大量导电环中环电流的抗磁响应。这项研究首先应该在聚合物复合材料中找到一种双负超材料。(C)© 2016 Elsevier B. V.版权所有。
Multi-walled carbon nanotubes(MWCNTs)/polypyrrole(PPy) nanocomposite particles were synthesized by in-situ polymerization. Negative permittivity and negative permeability appeared simultaneously in MWCNTs/PPy nanocomposites with different content of MWCNTs. It was found from SEM analysis that MWCNTs/PPy nanocomposite particles were randomly packed with a large number of micropores, and formed a lot of conductive loops around the micropores, some MWCNTs could be cross the micropores and increase the number of conductive loops. In the meantime, MWCNTs themselves in MWCNTs/PPy composite also formed many conductive networks. The negative permittivity behavior stem from the plasma oscillation of delocalized electrons in the conductive networks, and the negative permeability was attributed to the diamagnetic response of ring currents in the plentiful conductive loops. This study should initially find a double negative metamaterial in polymer composites. (C) 2016 Elsevier B.V. All rights reserved.