Room-temperature and flexible PEDOT:PSS-WO3 gas sensor for nitrogen dioxide detection

In this paper, a resistance type gas sensor which consists of tungsten oxide (PEDOT:PSS), (WO3) particles and silver finger electrodes was prepared on glass as well as (PET) substrates. The structural and surface morphological properties of the sensors were studied using (XRD), UV-visible, (FTIR), (FE-SEM) and 3D optical microscopy. The influence of fabrication parameters on the sensibility for nitrogen dioxide (NO2) detection is discussed. Experimental results reveal that the sensor with WO3 content of 2 g/mL shows the highest response rate of 2.31 with increasing concentration up to 80 ppm of nitrogen dioxide gas. The response of the flexible gas sensor reveals improved sensing performance after 500 bending tests.