This work focuses on the comparison between the morphological, chemical, and electrical properties of polyaniline doped with fluoridric and polyaniline, and doped with sulfuric acid. The FT-IR, XRD, and SEM/EDS results indicate that the use of hydro-fluoric acid as doping agent does not provide meaningful changes in the crystalline and morphological structure of polyaniline. Although, the inclusion of F- type counter-ions from the doping process with HF provide more compact, denser, and with higher electrical conductivity polymeric matrices. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 128: 430-435, 2013