Synergistic Enhancement of Microwave Absorption Using Hybridized Polyaniline@helical CNTs with Dual Chirality.
Synergistic Enhancement of Microwave Absorption Using Hybridized Polyaniline@helical CNTs with Dual Chirality.
复制标题
DOI：
10.1021/acsami.7b02607
复制
发表时间：
2017-04
影响因子：
9.5
通讯作者：
X. Tian;F. Meng;Fancheng Meng;Xiangnan Chen;Yifan Guo;Ying Wang;Wenjun Zhu;Zuowan Zhou
中科院分区：
文献类型：
--
作者：
X. Tian;F. Meng;Fancheng Meng;Xiangnan Chen;Yifan Guo;Ying Wang;Wenjun Zhu;Zuowan Zhou
在本研究中，我们设计了一种双手性分级结构，通过纳米材料的杂化实现微波吸收的协同增强效应。在此，通过原位聚合在螺旋碳纳米管（HCNT）（一种典型的纳米级手性结构）上生长具有可调手性的聚苯胺（PANi）纳米棒。实验结果表明，与纯PANi或HCNT相比，分级杂化物（PANi@HCNT）表现出明显的双手性，并且电磁（EM）损耗显着增强。所制备的混合体的最大反射损耗在 8.9 GHz 时可以达到 -32.5 dB。进一步的分析表明，手性酸掺杂的PANi和具有分子和纳米级手性的卷曲HCNT的组合会产生由双手性产生的协同效应。除了官能团和界面极化的多尺度弛豫之外，所谓的交叉极化可能会导致与感应电磁波的额外相互作用，这有利于电磁吸收。
In this study, we designed a dual-chirality hierarchical structure to achieve a synergistically enhanced effect in microwave absorption via the hybridization of nanomaterials. Herein, polyaniline (PANi) nanorods with tunable chirality are grown on helical carbon nanotubes (HCNTs), a typical nanoscale chiral structure, through in situ polymerization. The experimental results show that the hierarchical hybrids (PANi@HCNTs) exhibit distinctly dual chirality and a significant enhancement in electromagnetic (EM) losses compared to those of either pure PANi or HCNTs. The maximum reflection loss of the as-prepared hybrids can reach -32.5 dB at 8.9 GHz. Further analysis demonstrates that combinations of chiral acid-doped PANi and coiled HCNTs with molecular and nanoscale chirality lead to synergistic effects resulting from the dual chirality. The so-called cross-polarization may result in additional interactions with induced EM waves in addition to multiscaled relaxations from functional groups and interfacial polarizations, which can benefit EM absorption.