Solution-processed SnO2 nanowires for sensitive and fast-response H2S detection

Solution-processed nanocrystalline semiconductors possess ease of processing, physical flexibility and large area coverage, which are beneficial for developing high performance gas sensors with low cost. Here we reported low-temperature chemiresistive gas sensors based on SnO2 nanowires that were synthesized and dispersed in solution. The gas sensors were fabricated via a room-temperature spin-coating route and their sensing properties toward H2S at low temperatures were investigated. The sensors exhibited sensitive response upon H2S gas exposure at 70 °C with fast response (2 s at 50 ppm) and the response was fully recoverable upon H2S gas release. The highly sensitive response, combined with the benefit of room-temperature fabrication, make the solution-processed SnO2 nanowires attractive candidates for the construction of gas sensors.