Polypyrrole active layers of gas sensors prepared by MAPLE technology

Thin layers of polypyrrole (PPY) were deposited by MAPLE (Matrix Assisted Pulse Laser Evaporation) technology. The deposition was carried out by KrF excimer laser from water and dimethylsulfoxide matrixes. Ablation thresholds (Fth) were determined to be Fth ~ 0.3 J.cm−2for dimethylsulfoxide matrix and Fth ~ 0.45 J.cm−2for water matrix. The roughness of deposited layers was measured by AFM and their chemical composition was characterized by FTIR spectroscopy. Finally, resistance of sensors with PPY active layer was measured in dependence on working temperature and relative humidity of surrounding atmosphere.