Figure 8
Sensitivity of ZnO/CuO-H (5 mM) sensor to various H2S gas concentrations at optimal working temperature of 200 °C (a) and its summary in sensing H2S concentration (b). Reproducibility checked for ZnO/CuO-H (5 mM) sensor upon exposure to 5 ppm H2S at optimal working temperature of 200 °C (c). Selectivity histogram of ZnO/CuO-H (5 mM) structure sensors towards different gases: H2S (5 ppm), CH4 (250 ppm), CO (250 ppm), H2 (250 ppm), and NH3 (140 ppm) at a working temperature of 200 °C. (d) Inset in (b) shows uniform sensitivity (to 5 ppm H2S) of four ZnO/CuO-H (5 mM) sensors that are selected randomly in fabricated process.
