Multi-walled carbon nanotubes/polyaniline composites with negative permittivity and negative permeability
Multi-walled carbon nanotubes/polyaniline composites with negative permittivity and negative permeability
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DOI：
10.1016/j.carbon.2016.05.055
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发表时间：
2016-10
期刊：
影响因子：
10.9
通讯作者：
Yao Xiuchao;Xuechen Kou;J. Qiu
中科院分区：
文献类型：
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作者：
Yao Xiuchao;Xuechen Kou;J. Qiu
在金属颗粒/陶瓷复合材料中已经发现了本征双负超材料，但聚合物复合材料迄今为止尚未同时实现负介电常数和负磁导率。在本研究中，多壁碳纳米管（MWCNT）/聚苯胺（PANI）复合材料同时出现负介电常数和负磁导率。通过ATR和XRD测试，MWCNTs/PANI复合材料的化学键和结晶没有明显变化。 SEM分析发现，随着MWCNT含量的增加，MWCNTs/PANI复合材料形成不同的形貌。 MWCNTs/PANI复合材料中负介电常数和磁导率的出现源于MWCNTs和MWCNTs/PANI复合颗粒的导电网络、闭路结构。双负特性出现在 40 wt% MWCNT/PANI 复合材料中的频率范围为 955–1000 MHz，在 50 wt% MWCNT/PANI 复合材料中出现在 930–1000 MHz，在 60 wt% MWCNT/PANI 复合材料中出现在 925–1000 MHz，在 70 wt% 中出现在 915–1000 MHz。多壁碳纳米管/聚苯胺复合材料。该研究使得超材料的性能不再仅仅依赖于特定的结构组合，对超材料的研究和发展具有重要意义。
Intrinsic double negative metamaterials have been found in metal particles/ceramic composites, but polymer composites haven’t achieved negative permittivity and negative permeability simultaneously until now. Negative permittivity and negative permeability appear simultaneously in multi-walled carbon nanotubes (MWCNTs)/polyaniline (PANI) composites in present study. No significant change in chemical bond and crystallization is found in MWCNTs/PANI composites through ATR and XRD tests. It is found from SEM analysis that MWCNTs/PANI composites form different morphology with the increase of MWCNT content. Occurrence of negative permittivity and permeability in MWCNTs/PANI composites derives for conductive network, closed circuit structure of MWCNTs and MWCNTs/PANI composite particles. The double negative property appears in the frequency range 955–1000 MHz in 40 wt% MWCNTs/PANI composites, 930–1000 MHz in 50 wt% MWCNTs/PANI composites, 925–1000 MHz in 60 wt% MWCNTs/PANI composites and 915–1000 MHz in 70 wt% MWCNTs/PANI composites. This study makes the properties of metamaterials no longer only depend on specific combination of structures, thus possesses great significance on research and development of metamaterials.