填料对纳米管和纳米纤维复合材料导电性的影响
Filler Dependencies of Electrical Conductivity in Nanotube and Nanofiber Composites
摘要：
我们报告的聚合物纳米复合材料与纤维填料，明确考虑微观填料的功能和复制的复合材料作为随机分布的粒子通过电子隧穿互连的模型。通过利用关键路径法，我们能够获得简单的公式，适用于大多数纳米管和纳米复合材料，这允许从几个参数，如填料体积分数，尺寸和纵横比开始推断整体复合材料的电导率。我们制定的有效性进行评估，重新解释现有的实验结果，并通过提取的特征隧穿长度，这是大多数发现在其预期的值范围内。这些结果可以实际用于定制纳米复合材料的电性能。
英文摘要：
We report on a model of polymer nanocomposites with fibrous fillers which explicitly considers the microscopic filler features and replicates the composites as random distributions of particles interconnected via electron tunneling. By exploiting the critical path method, we are able to obtain simple formulas, applicable to most nanotube and nanofiber composites, which allow to infer the overall composite conductivity starting from few parameters like filler volume fraction, size, and aspect-ratio. The validity of our formulation is assessed by reinterpreting existing experimental results and by extracting the characteristic tunneling length, which is mostly found within its expected value range. These results can be used practically to tailor the electrical properties of nanocomposites.
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