Highly selective Sn2O3-based sensors for NO detection

Abstract Sn 2 O 3 -based NO gas sensors were fabricated and investigated in this study. The sensor doped by 1.0 at.% antimony had a maximal response to NO gas at 473 K. The NO gas with a concentration down to 10 ppm can be detected by the sensor without any cross sensitivity to the interfering species such as NO 2 and CO. The response speed was shortened about 5.7 times after mixing the 10.0 wt.% SnO 2 nanoparticles into the 1.0 at.% Sn 2 O 3 :Sb gas sensor, which was resulted from the formation of Sn 2 O 3 –SnO 2 hetero-junction. This kind of mixed-oxides gas sensor showed good response to NO gas, weak response to NO 2 gas and unstable response to CO gas.