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Grain shape influence on semiconducting metal oxide based gas sensor performance: modeling versus experiment

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Abstract

A model for sensing with semiconducting metal oxide (SMOX)-based gas sensors was developed which takes the effect of the shape of the grains in the sensing layers into account. Its validity is limited to materials in which the grains of the SMOX sensing layer are large enough to have an undepleted bulk region (large grains). This means that in all experimental conditions, the SMOX properties ensure that the influence of surface phenomena is not extended to the whole grain. The model takes the surface chemistry and its impact on the electrical properties of the sensing material into consideration. In this way, it relates the sensor signal—defined as the relative change of the sensor’s conductance—directly to the concentration of the target gas and also exhibits meaningful chemical parameters, such as the type of reactive oxygen species, the reaction constants, and the concentration of adsorption sites. The validity of the model is confirmed experimentally by applying it to data gathered by measuring homemade sensors in relevant conditions.

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Authors and Affiliations

  1. University of Tübingen, Auf der Morgenstelle 15, 72076, Tübingen, Germany

    Julia Rebholz, Peter Bonanati, Udo Weimar & Nicolae Barsan

Authors
  1. Julia Rebholz
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  2. Peter Bonanati
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  3. Udo Weimar
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  4. Nicolae Barsan
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Corresponding author

Correspondence to Nicolae Barsan.

Additional information

Published in the topical collection Chemosensors and Chemoreception with guest editors Jong-Heun Lee and Hyung-Gi Byun.

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Rebholz, J., Bonanati, P., Weimar, U. et al. Grain shape influence on semiconducting metal oxide based gas sensor performance: modeling versus experiment. Anal Bioanal Chem 406, 3977–3983 (2014). https://doi.org/10.1007/s00216-013-7502-0

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  • DOI: https://doi.org/10.1007/s00216-013-7502-0

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