Investigating the Inter-Tube Conduction Mechanism in Polycarbonate Nanocomposites Prepared with Conductive Polymer-Coated Carbon Nanotubes.
Investigating the Inter-Tube Conduction Mechanism in Polycarbonate Nanocomposites Prepared with Conductive Polymer-Coated Carbon Nanotubes.
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DOI：
10.1186/s11671-015-1191-x
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发表时间：
2015-12
影响因子：
--
通讯作者：
Lubineau G
中科院分区：
文献类型：
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作者：
Ventura IA;Zhou J;Lubineau G
提高聚合物导电性的一个众所周知的策略是用高纵横比和导电纳米颗粒如碳纳米管（CNT）掺杂聚合物。然而，这些纳米复合材料也表现出不期望的性能，如损伤敏感性和历史依赖性的电导率，因为它们的宏观电导率在很大程度上由管/管界面处的隧道效应决定。为了减少这些问题，已经开发了具有CNT的新的纳米复合材料，所述CNT已经涂覆有聚（3，4-亚乙基二氧噻吩）聚（苯乙烯磺酸盐）（PEDOT/PSS）的导电层。有人认为碳纳米管之间的绝缘区域被导电聚合物桥取代;这一点迄今尚未得到证实。我们建议在这里深入研究这些材料的宏观电导率是如何变化的，当（1）改变电负载的频率（阻抗谱），（2）改变机械静水压力，（3）改变电负载的电压。系统地比较了传统的碳纳米管/聚碳酸酯（CNT/PC）纳米复合材料的响应，所以我们可以澄清如何有效地抑制这些复合材料的隧道效应。目的是进一步阐明这种材料配方的传导机制。
A well-known strategy to improve the electrical conductivity of polymers is to dope them with high-aspect-ratio and conductive nanoparticles such as carbon nanotubes (CNTs). However, these nanocomposites also exhibit undesirable properties such as damage-sensitive and history-dependent conductivity because their macroscopic electrical conductivity is largely determined by the tunneling effect at the tube/tube interface. To reduce these issues, new nanocomposites have been developed with CNTs that have been coated with a conductive layer of poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOT/PSS). It has been posited that the insulating region between the CNTs is replaced by a conductive polymer bridge; this has not been proven up to now. We propose here to investigate in-depth how the macroscopic conductivity of these materials is changing when (1) varying the frequency of the electrical loading (impedance spectroscopy), (2) varying the mechanical hydrostatic pressure, and (3) varying the voltage of the electrical loading. The response is systematically compared to the one of conventional carbon nanotube/polycarbonate (CNT/PC) nanocomposites so we can clarify how efficiently the tunneling effect is suppressed from these composites. The objective is to elucidate further the mechanism for conduction in such material formulations.