Chemiresistive sensor for ammonia using inkjet printing of G/PEDOT:PSS composite at room temperature

This study reveals the fabrication of a gas sensor with a PEDOT:PSS/graphene ink composite as an active layer on glossy paper. The glossy paper was chosen as the substrate material due to its low cost and easy availability. PEDOT:PSS/graphene ink was synthesized by simple mixing of PEDOT:PSS and graphene solution in the presence of distilled water, ethanol, glycerol, and diethylene glycol and was then sonicated and stirred at room temperature and characterized by FTIR, UV, XRD, AFM, and SEM. The sensitivity of the gas sensors towards acetonitrile, propanol, butanol, benzene, methanol, and ammonia analytes was investigated by measuring the change in resistance using a conventional multimeter at room temperature. The results exhibited that the composite's response to ammonia change is stable and can measure concentration were the results also indicate that the sensors show promising responses with +/- 1% reading error with a high response percentage.