PT5.45 - Transient IR Spectroscopy as a Novel Approach to Unravel the Active Surface Species of Chemoresistive Gas Sensors
- Event
- EUROSENSORS XXXVI
2024-09-01 - 2024-09-04
Debrecen (Hungary) - Band
- Poster
- Chapter
- PT5 - Chemical Sensors
- Author(s)
- M. Pfeiffer, C. Hess - Technical University of Darmstadt (EZI), Darmstadt (Germany)
- Pages
- 339 - 340
- DOI
- 10.5162/EUROSENSORSXXXVI/PT5.45
- ISBN
- 978-3-910600-03-4
- Price
- free
Abstract
Transient IR spectroscopy was used as a novel method for the mechanistic investigation of sensor materials for chemoresistive metal oxide gas sensors. Taking unloaded and gold-loaded tin oxide as an example, it was shown that in situ modulation-excitation spectroscopy (MES) combined with phase sen-sitive detection (PSD) allows the identification of the active species of the sensor reactions towards ethanol and CO, as well as the observation of new surface adsorbates such as CO adsorbed on partially negatively charged gold nanoparticles (CO-Auδ-) not accessible under steady state conditions.