Electrical and electrochemical properties of polystyrene/polyaniline core–shell materials prepared with the use of a reactive surfactant as the polyaniline shell precursor

Abstract

Series of polystyrene/polyaniline core–shell composites were synthesized by adding reactive surfactant anilinium dodecylsulfate (DS-AN) as the monomer of polyaniline. DS-AN conversion to polyaniline was calculated by quantitative infrared spectroscopy and thermogravimetric analysis, showing both methods small differences. Composites particle size distribution showed no clear evidence of increment in the overall composite particle diameter as function of polyaniline content; however, electron microscopy (HR mode) showed that the conductive polymer was deposited over the polystyrene cores in the form of thin coatings. Composites electrical conductivity, determined by the 4-probe technique, was in the range 10−6 to 10−2Scm−1. The percolation–tunneling mechanism, according to the curve of conductivity (Scm−1) versus polyaniline (wt%), was the electron transfer mechanism. Finally, all the composites were electroactive, as shown by cyclic voltammetry.