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Operando Investigations of Differently Prepared In2O3-Gas Sensors

Institute of Physical and Theoretical Chemistry, Eberhard Karls University Tübingen, Auf der Morgenstelle 15, D-72076 Tübingen, Germany
Author to whom correspondence should be addressed.
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
Proceedings 2017, 1(4), 432;
Published: 29 August 2017
(This article belongs to the Proceedings of Eurosensors)
PDF [286 KB, uploaded 29 August 2017]


In this study, the electrical characteristics and surface reactions of three different kinds of In2O3 based gas sensors were investigated under CO exposure in dry and humid air by using DC electrical resistance measurements and Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). For the first time one gains insight into the surface reactions during the exposure to CO and humidity. The sensors show different behavior on the baseline in humidity depending on the material which is due to different kinds of OH-groups. The resistance change under CO and humidity exposure are additive and the molecules compete for the same reaction partner confirmed by the spectroscopy results. Through isotopic exchange experiments, different adsorbates could be identified.
Keywords: In2O3; gas sensors; SMOX; DRIFTS; operando; surface chemistry In2O3; gas sensors; SMOX; DRIFTS; operando; surface chemistry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Can, I.; Weimar, U.; Barsan, N. Operando Investigations of Differently Prepared In2O3-Gas Sensors. Proceedings 2017, 1, 432.

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