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In this paper, we demonstrate a novel flexible gas sensor based on polypyrrole (PPy) coated SnO2 nanoparticles that can be employed to detect low concentrations of NO2 (0.5 – 5 ppm) at room temperature. This low-cost, easy-fabrication and wearable gas sensor was fabricated on PET substrate. The sensitive film was formed by first drop casting the solution of SnO2 nanoparticles and FeCl3 on the as patterned...