fig5

Figure 5. Gas sensitivity test results of Au@Co-ZnO nanostructure and its contrast samples in ethanol gas. A: temperature dependence curves of Au@Co-ZnO and its comparison samples on 100 ppm ethanol; B: response-recovery curves of pure ZnO to 100 ppm ethanol at 180 °C; C: response-recovery curves of pure Co-ZnO to 100 ppm ethanol at 140 °C; D: response-recovery curves of pure Au@Co-ZnO to 100 ppm ethanol at 140 °C; E: the continuous response-recovery curves of Au@Co-ZnO and its comparison samples to different concentrations of ethanol gas, illustrated is a local amplification of the continuous response-recovery curves of ethanol concentration from 0.2ppm to 10ppm; F: response value-concentration curves of Au@Co-ZnO and its comparison samples; G: response value-concentration linear fitting curves of Au@Co-ZnO and its comparison samples.