Zahra Hasanzadeh - Chemical Engineering Department, Faculty of Engineering, University of Isfahan, Isfahan, I.R. Iran
Amir H. Navarchian - Chemical Engineering Department, Faculty of Engineering, University of Isfahan, Isfahan, I.R. Iran
Mahdi Niroomand - Eelectrical Engineering Department, Faculty of Engineering, University of Isfahan, Isfahan, I. R. Iran.

Detection of Ammonia is of great importance in petrochemical industries. Polyaniline (PANI) is one of the most interesting conductive polymers used as ammonia gas sensor. This is dueto its wide range of conductivity from insulating to metallic regime, low cost and ease of synthesis. The reactionparameters during the polymerization of aniline may affects the sensing properties of resulted PANI [1-4]. In this article we have studied the effects of synthetic parameters on thesensing properties of PANI films. The optimum condition for to attain the highest sensitivity for PANI as an ammonia gas sensor is then determined using Taguchi experimental design