High sensitivity gas sensors based on SnO2 nanowires

Abstract

Network structure of SnO2 nanowires were fabricated on the electrodes and its gas sensing propertires for NO2 were examined. The nanowires were synthesized by thermal evaporation process at low temperature of 600~700degC. The diameter of the nanowires ranged from 50 nm to 200 nm depending on the processing temperature and the mixed oxygen content with Ar. X-ray diffraction analysis and transmission electron microscopy analysis indicated that the SnO2 nanowires are single crystals. At the concentration of NO2 of 20 ppm, the value of the sensitivity attaining 300, response time of 100 s, and recovery time of 200 s were observed.