Electrical conductivity of synergistically hybridized nanocomposites based on graphite nanoplatelets and carbon nanotubes
Electrical conductivity of synergistically hybridized nanocomposites based on graphite nanoplatelets and carbon nanotubes
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DOI：
10.1088/0957-4484/23/40/405202
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发表时间：
2012-10
期刊：
影响因子：
3.5
通讯作者：
M. Safdari;M. Al-Haik
中科院分区：
文献类型：
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作者：
M. Safdari;M. Al-Haik
在本研究中，一个用于评估包含单一类型导电纳米填料的纳米复合材料的电导率的最新模型被扩展到含有纳米填料的混合物的情况。扩展模型认为电子隧穿是绝缘体-导体转变的有效机制。以单纳米填料为实验对象，对模型进行了验证。利用扩展模型，研究了由石墨纳米片和碳纳米管组成的纳米复合材料的有效电导率。研究人员观察到，这些导电纳米填料的混合物填充的杂化纳米复合材料在较低体积分数下获得了协同增强的导电性。较低的填料含量有助于保持宿主聚合物的固有特性，支持多种应用。研究还发现，导电填料的相对长径比对杂化纳米复合材料的电导率有显著影响。模拟结果表明，通常情况下，在低长径比主相的基础上加入少量高长径比辅助相，复合材料的电导率提高了几个数量级
In this investigation, a recent model for assessing the electrical conductivity of nanocomposites comprising a single type of conductive nanofiller was expanded to cases with mixtures of nanofillers. The extended model considers electron tunneling as the effective mechanism for insulator–conductor transition. The model was validated with relevant experimental data based on a mono-nanofiller. Using the extended model, the effective electrical conductivity of a nanocomposite comprising both graphite nanoplatelets and carbon nanotubes was investigated. It was observed that the hybridized nanocomposites filled with a mixture of these conductive nanofillers attain, synergistically, enhanced electrical conductivities at lower volume fractions. The lower filler contents assist in preserving the intrinsic properties of the host polymer in support of several applications. It was also observed that the relative aspect ratios of the conductive fillers play significant roles on the electrical conductivity of the hybrid nanocomposite. Simulations revealed that, generally, the addition of minimal amounts of a higher aspect ratio auxiliary phase to a lower aspect ratio main phase enhances the electrical conductivity of the composite by orders of magnitude