P1.0.16 Sensing mechanism of hydrogen sensors based on Pd loaded tungsten oxide (Pd-WO3)
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- P1.0 Metal Oxide-based Sensors
- Author(s)
- A. Boudiba, C. Zhang, M. Olivier, M. Debliquy - Service de Science des Matériaux, Faculté Polytechnique, Université de Mons (Belgium), R. Snyders - Laboratoire de Chimie des Interactions PlasmaSurface, Université de Mons (Belgium), P. Roussel - Ecole Nationale Supérieure de Chimie de Lille, Unité de Catalyse et Chimie du Solide UMR CNRS (France).
- Pages
- 795 - 797
- DOI
- 10.5162/IMCS2012/P1.0.16
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
This paper presents a study on hydrogen sensing mechanism of Pd-loaded tungsten oxide nanocomposites (Pd-WO3). The Pd- WO3 nanocomposites were prepared and characterized by SEM, TEM, XRD and XPS analyses. The responses to 25-200 ppm hydrogen were measured at 50% relative humidity. The changes in the optical properties and crystal phases of Pd- WO3 in contact with hydrogen were investigated by UV-Vis-IR spectroscopy and XRD. In-situ characterization were carried out at different conditions, 3% H2 diluted in synthetic air/or nitrogen at temperatures ranging from 25 to 200°C. The changes in the crystal phases (formation of hydrogen tungsten bronze) in the surface or in bulk were correlated with the electrical responses. More experimental results and explanations will be presented and discussed.