Fig. 7From: Effect of Surfactants on the Microstructures of Hierarchical SnO2 Blooming Nanoflowers and their Gas-Sensing Propertiesa Response of SPVP sensor to 100 ppm ethanol, acetone, methanol, and formaldehyde at different operating temperatures. b Response of SPVP sensor to 100 ppm H2S at different operating temperatures. c Response versus time curves of the sensors to 10–200 ppm H2S consecutively at180 °C. d Dynamic sensing transient of the sensors to 100 ppm H2S at 180 °CBack to article page