Fig. 6. (a, b) Schematic illustrations and SEM images of single nanowire sensor devices for the (a) ZnO nanowire and (b) (Cu, Zn)O nanowire. The CuO thickness for the (Cu, Zn)O nanowire is 10 nm. (c, d) Successive five sensor responses and (e, f) typical single sensor response to 2.48 ppm nonanal for the (c, e) ZnO nanowire device and (d, f) (Cu, Zn)O nanowire device, respectively. All measurements were performed at 200 °C with a readout voltage of 1 V. (g) Recovery time and (h) sensitivity Ra/Rg for the ZnO nanowire device and (Cu, Zn)O nanowire device. ‘NWs’ and ‘NW’ represent ‘nanowires’ and ‘nanowire’, respectively.
