NH3 sensing with self-assembled ZnO-nanowire μHP sensors in isothermal and temperature-pulsed mode

Dielectrophoretic alignment is found to be a simple and efficient method to deposit the solution prepared ZnO nanowires onto micro hot plate substrates. Due to the strong surface effects, positive temperature coefficient for resistance was encountered with ZnO nanowires in the high temperature range...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2016-04, Vol.226, p.110-117
Main Authors: Shao, F., Fan, J.D., Hernández-Ramírez, F., Fàbrega, C., Andreu, T., Cabot, A., Prades, J.D., López, N., Udrea, F., De Luca, A., Ali, S.Z., Morante, J.R.
Format: Article
Language:English
Subjects:
Ammonia
Amoníac
Gas sensor
Micro hot plate
Nanowire
Semiconductors
Silici
Silicon
Temperature-pulsed
Zinc oxide
ZnO
Òxid de zinc
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Summary:Dielectrophoretic alignment is found to be a simple and efficient method to deposit the solution prepared ZnO nanowires onto micro hot plate substrates. Due to the strong surface effects, positive temperature coefficient for resistance was encountered with ZnO nanowires in the high temperature range (>250°C). The response to ammonia (NH3) was evaluated in isothermal and temperature-pulsed operation mode; the relative higher response observed in the latter case demonstrates that the use of this methodology is a good strategy to improve the performance of metal oxide sensors based on nanomaterials. Here, we evaluate the response to NH3 and qualitatively describe the sensing mechanism in temperature-pulsed mode, highlighting the main differences compared to the standard isothermal methodology.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2015.11.109