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Title: Site-selectively grown SnO2 NWs networks on micromembranes for efficient ammonia sensing in humid conditions
Author: Samà Monsonís, Jordi
Barth, Sven
Domènech Gil, Guillem
Prades García, Juan Daniel
López, Núria (López Alonso)
Casals Guillén, Olga
Gràcia Tortadés, Isabel
Cané i Ballart, Carles
Romano Rodríguez, Albert
Keywords: Amoníac
Detectors de gasos
Gas detectors
Issue Date: 22-Mar-2016
Publisher: Elsevier B.V.
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.
Note: Versió postprint del document publicat a:
It is part of: Sensors and Actuators B-Chemical, 2016, vol. 232, p. 402-409
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ISSN: 0925-4005
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Publicacions de projectes de recerca finançats per la UE

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