Characterization, magnetic and transport properties of polyaniline synthesized through interfacial polymerization

The present work describes the interfacial polymerization of aniline in the absence or presence of surfactants. Polyaniline was readily obtained in the semi-oxidized doped state and was cast from the aqueous phase. The structural and morphological characteristics of the polyanilines were deduced from X-ray Diffractometry and Scanning Electron Microscopy. Various morphologies were obtained depending on the surfactant addition. Conductivity measurements recorded for HCl doped polyaniline nanoneedles from 5 to 330 K showed a Tc value at 230 K, where their transport behaviour changes from metallic-like above Tc to semiconductive below Tc. Furthermore, extensive magnetic measurements have been performed as a function of applied field and temperature.