Influence of oxygen backgrounds on hydrogen sensing with SnO₂ nanomaterials

The influence of different oxygen backgrounds on the sensing of hydrogen with SnO₂ nanomaterials was investigated and a model was proposed. It is based on two hydrogen reaction mechanisms at the surface of tin oxide that can take place simultaneously; the weight of each mechanism depends on the conc...

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Bibliographic Details
Published in:	Sensors and actuators. B, Chemical Chemical, 2011-06, Vol.154 (2), p.264-269
Main Authors:	Hübner, M, Pavelko, R.G, Barsan, N, Weimar, U
Format:	Article
Language:	eng
Subjects:	Actuators Construction Detection hydrogen ions Mathematical models Nanomaterials oxygen Oxygen ions reaction mechanisms tin Tin dioxide Tin oxides
Online Access:	Get full text
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Summary:	The influence of different oxygen backgrounds on the sensing of hydrogen with SnO₂ nanomaterials was investigated and a model was proposed. It is based on two hydrogen reaction mechanisms at the surface of tin oxide that can take place simultaneously; the weight of each mechanism depends on the concentration of oxygen in the ambient atmosphere. In the absence of oxygen the adsorbed hydrogen builds surface donors (rooted hydroxyl groups). In the presence of oxygen the reaction between hydrogen and pre-adsorbed oxygen ions dominates. Due to the fact that this behavior is present for very different nanomaterials, the model probably describes a SnO₂ specific feature.
ISSN:	0925-4005 1873-3077