Novel flexible room temperature NO2 gas sensor based on polypyrrole coated SnO2 nanoparticles

摘要

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 interdigital electrodes on PET substrate; then the substrate was exposed to saturated pyrrole vapor for 3h to obtain PPy coated SnO2 sensitive film. Our sensor shows good performance in detecting low concentration NO2 and the estimated detection limit is about 100 ppb at room temperature.