Thin polymer films containing polyaniline doped with several organic dopants were manufactured and their conductivity was measured. The effect of chloroform vapour on the composite film conductivity was examined. The possibility of fabricating polyaniline-based chemiresistors working as gas detectors was taken into consideration. Resistivity of polymeric films patterned by Solvent Assisted Micro-molding was also studied. Furthermore, impedance spectroscopy measurements were performed of thin films of pure doped polyaniline and of its blend with an insulating polymer.