Speaker
Description
Understanding the mode of operation of metal-oxide gas sensors (e.g. SnO2, In2O3) is of great scientific and economic interest. Such a knowledge based approach requires the development and application of spectroscopic tools to monitor the relevant surface and bulk processes under working conditions (operando approach). In this contribution, we will present recent operando results on ethanol and CO detection using undoped and Ag doped In2O3 gas sensors, demonstrating the advantages of (i) operando Surface Enhanced Raman Spectroscopy (SERS) to monitor the metal oxidation state, and (ii) extending our operando Raman / gas phase FT-IR setup by UV-Vis spectroscopy to reveal the degree of In2O3 reduction.
Summary
Our studies highlight the potential of combined operando spectroscopic characterization of metal-oxide gas sensors for elucidating their mode of operation on a molecular level.
