Abstract
Polyaniline (PAN) films were cast from a solution in N-methyl-2-pyrrolidone (NMP) and characterised by atomic force microscopy (AFM), FTIR, X-ray, TGA and DSC. Ion selectivity of the films as free-standing membranes in the electrolyte/membrane/electrolyte system was characterised by transmembrane electric potential. It was demonstrated that PAN membrane has completely different permeability and ion selectivity in the undoped and HCl-doped states. In the undoped state, the membrane is hardly permeable to inorganic ions, but still it is selective to H +. After HCl-doping transmembrane resistance decreases by a few orders of value, and the membrane becomes anion/H +-selective.
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