GS1.4 - Sensing with Noble Metal Oxide Loaded WO3

Event
17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
Chapter
Gas Sensors 1 - Fundamentals
Author(s)
A. Staerz, U. Geyik, H. Brinkmann, U. Weimar, N. Barsan - Institute of Physical and Theoretical Chemistry and the Centre for Light-Matter Interaction, Sensors & Analytics, Eberhard Karls University of Tuebingen (Germany)
Pages
68 - 69
DOI
10.5162/IMCS2018/GS1.4
ISBN
978-3-9816876-9-9
Price
free

Abstract

WO3 is one of the most commonly used materials for commercially available semiconducting metal oxide based gas sensors. In most cases, noble metals are added to WO3 to increase stability and tune its sensing characteristics. In order to deliberately tune SMOX based sensors, understanding how the presence of the noble additives affects sensing would be helpful. Here using, DC resistance measurements and operando diffuse reflectance infrared Fourier spectroscopy (DRIFTS) the previously suggested sensing mechanism for Rh2O3 loading has been verified and expanded to platinum oxide-loaded WO3. It is proven that the reactions between the noble metal oxide and the analyte gases are responsible for the reception. In turn the resulting changes in the heterojunction characteristics control the transduction

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