Polyaniline (PANI)/Nylon-6 composite films were prepared by oxidative polymerization of aniline (ANT) inside host Nylon-6 film. Such a composite has the desired electro-active and mechanical properties to serve as a self-standing functional unit. Comparative studies on sorption of ANT by Nylon-6 matrix from various ANT containing media were conducted revealing superior ANT uptake from neutral ANI solution in water. ANT content was measured to be as high as 12%. Spectroscopic measurements showed that hydrogen bonding seemed to play important role in ANT sorption by Nylon-6 matrix. Polymerization was monitored using atomic force microscopy and conductivity measurements. The morphology studies showed the appearance of PANT nanodomains on Nylon-6 surface in the early stages of the polymerization. Eventually the domains coalesced during polymerization forming a continuous PANT layer. The conductivity measurements confirmed the change of the morphology from isolated islands to continuous conducting surface by drastic increase in conductivity. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 114: 1643-1647, 2009