Conformation of polyaniline: Effect of mechanical shaking and spin casting

We find from diffuse reflectance Vis/UV spectral studies of polyaniline (emeraldine base; EB) powder doped with camphorsulfonic acid (HCSA) that the free carrier tail characteristic of an extended coil conformation appears and increases gradually on mechanical shaking with KBr powder. We also find that the forces present during spin-casting of EB films have a signifigant effect on the value of the absorption maximum of the exciton peak.