Electrical Permittivity and Electrical Conductivity of Multiwall Carbon Nanotube‐Polyaniline (MWCNT‐PANi) Core‐Shell Nanofibers and MWCNT‐PANi/polystyrene Composites

In situ polymerization of aniline monomers in the presence of multiwall carbon nanotubes (MWCNTs) leads to core–shell nanostructures for use in conductive polymer composites. The conductivity of core–shell nanofibers can be tuned by altering coating thickness. These high‐aspect‐ratio MWCNT‐polyaniline core–shell nanofibers are dispersed in polystyrene (PS) using solution mixing. These composites exhibit electrical percolation at a much lower concentration than MWCNT/PS composites. Polyaniline (PANi), when used as a coating layer, is able to attenuate electromagnetic (EM) waves via absorption. The dielectric measurements of MWCNT‐PANi/PS composites show one order of magnitude increase in real electrical permittivity compared with that of MWCNT/PS composites, making them suitable for charge storage purposes.