Fig. 8From: High Methanol Gas-Sensing Performance of Sm2O3/ZnO/SmFeO3 Microspheres Synthesized Via a Hydrothermal MethodSelectivity of microsphere at different hydrothermal time based on S1 (a), S2 (b), S3 (c), and S4 (d) to various gases with a concentration of 5 ppm at 195 °CBack to article page