Determinant role of tunneling resistance in electrical conductivity of polymer composites reinforced by well dispersed carbon nanotubes
Determinant role of tunneling resistance in electrical conductivity of polymer composites reinforced by well dispersed carbon nanotubes
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DOI：
10.1063/1.3499628
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发表时间：
2010-10
影响因子：
3.2
通讯作者：
Yong Yu;G. Song;Li Sun
中科院分区：
文献类型：
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作者：
Yong Yu;G. Song;Li Sun
采用三维Monte Carlo模拟方法研究了由导电纳米填料和绝缘聚合物基体组成的纳米复合材料的导电性能。当纳米填料的浓度低，他们很好地分散在绝缘基体中，纳米填料结之间的电子隧穿电阻被发现在电子传输中发挥主导作用。除了隧穿电阻之外，还存在导电纳米管段的电阻。这两种类型的电阻形成电子电导的电阻网络。对于具有良好分散性的复合材料，单个管被聚合物分子分开，并且所产生的隧穿电阻可以比单个管的电阻大几个数量级。考虑到这两种类型的电阻总是以交替的顺序连接在电阻网络中，更大的隧穿电阻在纳米复合材料的电阻中起着决定性的作用。当Contri…
Three-dimensional Monte Carlo simulation is used to investigate the electrical conductivity of nanocomposites composing of conducting nanofillers and insulating polymer matrix. When nanofillers concentrations low and they are well dispersed in the insulating matrix, electron tunneling resistance between the nanofiller junctions is found to play the dominant role in electron transport. In addition to the tunneling resistance, there is also the resistance of the conducting nanotube segments. These two types of resistance form the resistor network for electron conductance. For composites with well dispersion, individual tubes are separated by polymer molecules and the resulted tunneling resistance can be several orders larger in magnitude than the resistance of individual tubes. Considering the two types of resistors are always linked in an alternating order in the resistor network, the much larger tunneling resistance plays the determinant role in the electrical resistance of nanocomposites. When the contri...