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Abstract
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In this article, the properties of tunneling mediums
between adjacent nanotubes in polymer carbon nanotubes
nanocomposites are investigated assuming the
main tunneling mechanism of electrical conductivity. The
tunneling distance is expressed as a function of filler and
interphase dimensions by the roles of these parameters
in percolation threshold and effective filler fraction. In
addition, the tunneling resistance and conductivity are
defined based on the tunneling distance. The properties
of tunneling spaces are determined in some samples and
their variations at different ranges of parameters are analyzed.
It is found that the addition of filler concentration
decreases both tunneling distance and resistance. Also,
low percolation threshold and high filler concentration
are necessary to reduce the tunneling distance and resistance.
Moreover, thin nanotubes, low waviness, thick
interphase and long nanotubes cause desirable properties
for tunneling mediums. According to this analysis,
short tunneling distance and low tunneling resistance
create high conductivity in polymer nanocomposites.
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