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. Figure 9. Imaginary permittivity of MWCNT90-PANi10 nanofiber and pure MWCNT composites with PS.
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