Room Temperature UV-Activated NO2 and NO Detection by ZnO/rGO Composites

Nanocomposites, including nanoparticles of semiconductor metal oxide (MO) and reduced graphene (rGO), are exceptional interest for light-activated gas sensors functioning without thermal heating. In this paper, we discuss the sensor properties electrospun ZnO nanofibers ZnO/rGO composites. The materials were characterized by transmission scanning electron microscopy (TEM, SEM), X-ray diffraction (XRD), photoelectron spectroscopy (XPS), IR (FTIR). characteristics studied when detecting reducing gases CO, H2, NH3 oxidizing NO NO2 at 25–150 °C in dark conditions under UV illumination. composites have no sensitivity NH3, H2 either or At T = 25 °C, illumination is a necessary condition appearance response both NO2. increased nitrogen oxides discussed terms heterojunction formation. Observed 150 opposite trends influence on toward due to participation chemisorbed oxygen processes responsible formation NO.