Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7143709 | Sensors and Actuators B: Chemical | 2016 | 20 Pages |
Abstract
SnO2 NWs networks on heated micromembranes have been characterized as ammonia sensors. The approach allows achieving reproducible growth and stable and long-lasting ammonia sensors with site-specific grown SnO2 NWs. The devices have been tested both in dry and humid conditions showing response time down to two minutes. Sensors have been tested up to 1 month, only presenting variation of the base resistance with full retention of the response towards the gaseous analytes. Different concurrent sensing mechanisms have been identified relating the determined sensing kinetics with previous theoretical calculations. Specifically, oxygen dissociation seems to play a key role in the overall ammonia sensing sequence. In humid conditions, moisture reduces the response to ammonia but also lowers the activation energy of the reaction process.
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Authors
Jordi Samà , Sven Barth, Guillem Domènech-Gil, Joan-Daniel Prades, Núria López, Olga Casals, Isabel Grà cia, Carles Cané, Albert Romano-RodrÃguez,