Electrically conductive polymer nano-composites

GNP_100_05
Oblate ellipsoids with an aspect ratio of 100 at 5% volume fraction. The green ellipsoids form the percolating network that spans across the domain. The red ellipsoids belong to clusters that are form islands which are not part of the percolating cluster.

Adding a small volume fraction of highly-conductive and highly-anisotropic nano-fillers such as carbon nanotubes (CNTs) and graphene nanoplateletes (GNPs) leads to dramatic rise in the electrical conductivity of inherently nonconductive polymers. The sudden rise in conductivity is understood as a result of the percolating network of fillers that are interconnected (electrically) through electron tunneling. We have implemented a percolation-tunneling model to study the effect of filler shape and spatial distribution on the effective electrical conductivity.

 

Related publications:

[1] “Tunneling-percolation behavior of polydisperse prolate and oblate ellipsoids”, S. Kale, F. Sabet, I. Jasiuk, and M. Ostoja-Starzewski, Journal of Applied Physics, 118(15), 154306, 2015. (Featured article on the cover page)

[2] “Effect of filler alignment on percolation in polymer nanocomposites using tunneling-percolation model”, S. Kale, F. Sabet, I. Jasiuk, and M. Ostoja-Starzewski, Journal of Applied Physics, 120, 045105-1-10, 2016.

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