Abstract: Multiwalled carbon nanotubes (MWCNTs) were surface treated with an acid mixed, in which aniline was insitu polymerized forming conductive compositeswith ammonium persulfate as an oxidant. The morphology and performance of the composites were characterized using transmission electron microscope, Fourier transform infrared spectroscopy, UVvisible spectrophotometer, and Xray diffraction. The electrical properties of the composites were measured using twoprobe method and analyzed with mean field theory and a percolation threshold value of 2.36 % was observed. The diameter of the MWCNTs was 60~100 nm, and the length was about a few tens of micron. On the surface of MWCNTs a large number of —OH and —COOH groups were formed.

Key words: polyaniline, multi-walled carbon nanotubes, conductivity, percolation threshold