Interactions of the Polyaniline and Nafion bilayer sensor structure with ammonia in a dry and wet air atmosphere

Presented here are the preliminary results concerning an interactions of a novel bilayer sensor structure of polyaniline and Nafion as an ammonia gas sensors in a Surface Acoustic Wave and electric planar systems. The investigations were performed with a 50 and 100 ppm concentrations of the ammonia (NH3) in a synthetic dry (relative humidity RH∼4–5%) and wet air (RH∼50–54%) atmosphere. The prototype polyaniline and nafion bilayer structure has been manufactured by two deposition technologies: 72 nm of PANI by PVD technology and Nafion film ($\sim\kern-3pt 300$ nm) by spin coating technology and specific process of annealing. A good interactions with ammonia for the bilayer structure (PANI film with Nafion) has been observed especially at higher relative humidity of the atmosphere