Gas sensing properties of SnO2 nanowires on micro-heater

Abstract The SnO 2 nanowires (NWs) network gas sensors were fabricated on a micro-electrode and heater suspended in a cavity. The sensors showed selective detection to C 2 H 5 OH at a heater power during sensor operation as low as 30–40 mW. The gas response and response speed of the SnO 2 NWs sensor to 100 ppm C 2 H 5 OH were 4.6- and 4.7-fold greater, respectively, than those of the SnO 2 nanoparticles (NPs) sensor with the same electrode geometry. The reasons for these enhanced gas sensing characteristics are discussed in relation to the sensing materials and sensor structures.