Polyaniline nanoparticle -nPANI- was successfully synthesized through ultrasonic-assisted reverse microemulsion polymerization method. The effect of four parameters including concentration of aniline -ANI- as monomer, molar ratio of dodecybenzene sulfonic acid -DBSA- as surfactant to ANI, molar ratio of ammonium peroxydisulfate -APS- as oxidant to ANI and polymerization temperaturewere systematically studied in terms of the structural characterizations of nPANI by applying the Taguchi method of experimental design. Data analysis indicated that there is a dependency between conductivity and particle size in the nanoscale; the maximum conductivity of nPANI was obtained when the diameter of the particles was 30 nm.

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