[Zurück]

J. Sama, S. Barth, G. Domènech-Gil, J. Prades, N. Lopez, O. Casals, I. Gracia, C. Cane, A. Romano-Rodriquez:
"Site-selectively grown SnO2NWs networks on micromembranes forefficient ammonia sensing in humid conditions";
Sensors and Actuators B: Chemical, 232 (2016), S. 402 - 409.

SnO2NWs networks on heated micromembranes have been characterized as ammonia sensors. Theapproach allows achieving reproducible growth and stable and long-lasting ammonia sensors with site-specific grown SnO2NWs. The devices have been tested both in dry and humid conditions showingresponse time down to two minutes. Sensors have been tested up to 1 month, only presenting variationof the base resistance with full retention of the response towards the gaseous analytes. Different concur-rent sensing mechanisms have been identified relating the determined sensing kinetics with previoustheoretical calculations. Specifically, oxygen dissociation seems to play a key role in the overall ammoniasensing sequence. In humid conditions, moisture reduces the response to ammonia but also lowers theactivation energy of the reaction process.

http://dx.doi.org/10.1016/j.snb.2016.03.091

http://publik.tuwien.ac.at/files/publik_254546.pdf