Electrospun ZnSnO 3 /ZnO Composite Nanofibers and Its Ethanol-Sensitive Properties.

In this work, a novel heterojunction based on ZnSnO₃/ZnO nanofibers was prepared by a simple electrospinning method. The crystal, structural, and surface compositional properties of ZnSnO₃ and ZnSnO₃/ZnO composite nanofibers were investigated by X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS), and Brunauer–Emmett–Teller (BET). Compared to pure ZnSnO₃ nanofibers, the ZnSnO₃/ZnO heterostructure nanofibers had high sensitivity and selectivity response with the fast response toward ethanol gas at low operational temperature. The sensing response of the sensor based on ZnSnO₃/ZnO composite nanofibers was 19.6 toward 50 ppm ethanol gas at 225 °C, which was about 1.5 times superior to that of pure ZnSnO₃ nanofibers. It can be owed mainly to the oxygen vacancies and the synergistic effect between ZnSnO₃ and ZnO. [ABSTRACT FROM AUTHOR]