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A two-step model for the tunneling conductivity of polymer carbon nanotube nanocomposites assuming the conduction of interphase regions

机译：假设相间区域导电的聚合物碳纳米管纳米复合材料隧穿电导率的两步模型

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摘要

This work develops a two-step model for the conductivity of polymer carbon nanotube (CNT) nanocomposites (PCNT) assuming the properties of tunneling and interphase regions. In step 1, CNT and the surrounding interphase are considered as pseudoparticles and a simple model predicts their conductivity. After that, a suitable model calculates the conductivity of nanocomposites containing pseudoparticles, tunneling regions and polymer matrixes in step 2. The waviness of CNT as well as the fractions of CNT and interphase regions in the conductive networks is also considered. The experimental results of several samples and the reasonable roles of all parameters in the conductivity of nanocomposites support the predictions of the two-step model. Thin and long CNTs can cause a high conductivity, but only thick CNTs result in the least conductivity. Also, the thickness and conduction of interphase zones directly control the conductivity of nanocomposites. So, it is important to provide a strong interphase in PCNT to achieve a high conductivity. Moreover, a poor percolation threshold and a short tunneling distance enhance the conductivity of nanocomposites, whereas only a large tunneling distance dominantly reduces the conductivity.
机译：假设隧穿和相间区域的特性，这项工作为聚合物碳纳米管（CNT）纳米复合材料（PCNT）的电导率建立了两步模型。在步骤1中，将CNT和周围的相作为假粒子，并通过简单的模型预测它们的电导率。之后，在第2步中，一个合适的模型计算包含假颗粒，隧穿区域和聚合物基质的纳米复合材料的电导率。还要考虑CNT的波度以及导电网络中CNT的分数以及CNT的分数和相间区域。几个样品的实验结果以及所有参数在纳米复合材料电导率中的合理作用支持了两步模型的预测。细而长的CNT可能导致高电导率，但只有厚的CNT导致电导率最小。而且，相间区域的厚度和传导直接控制纳米复合材料的传导性。因此，重要的是在PCNT中提供牢固的界面以实现高导电性。此外，较差的渗透阈值和较短的隧穿距离会提高纳米复合材料的电导率，而只有较大的隧穿距离会显着降低电导率。

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