Introduction
Since the discovery of the carbon nanotube (CNT), considerable
studies have been focused on the CNT for the
filler in the polymer/CNT composites because of its superior
electrical and mechanical properties.1-12 In particular, the
polymer/CNT composites for the application to the electrostatic
discharge (ESD) and electromagnetic-radio frequency
interference shielding (EMI SE) materials has been widely
studied because of its excellent electrical properties and
high aspect ratio.6,13 For example, the CNT showed high
electrical conductivity up to 103 S/cm.13 Also, the CNT has
very large aspect ratio, as high as 1,000-10,000. This high
aspect ratio allows the percolated structure, which provides
a conductive path for charge to flow in the polymer/CNT
composites, at very low volume content of the CNT.
According to the theoretical prediction, the percolation
threshold of the cylindrical shaped filler with aspect ratio of
1000 was at 0.05 vol% in the polymer/filler composites