| AVS 63rd International Symposium & Exhibition | |
| Surface Science | Monday Sessions |
| Session SS+AS+HC-MoA |
| Session: | Metals, Alloys, and Oxides: Reactivity and Catalysis |
| Presenter: | Anthony Babore, University of California Irvine |
| Authors: | A. Babore, University of California Irvine J.C. Hemminger, University of California Irvine |
| Correspondent: | Click to Email |
Recent first principle calculations by Pacchioni and coworkers1 suggest that sulfur dopants incorporated into the WO3 lattice could favorably shift the band gap for enhanced visible light absorption. The present study aims to gain fundamental insight into the reactivity of a simple sulfur doped tungsten oxide system by using temperature programmed desorption (TPD) and water (D2O) as a probe molecule. Furthermore, water desorption spectra were also obtained for pure oxide and pure sulfide films on W (100) for comparison. Auger electron spectroscopy (AES) was used to confirm the presence and relative amounts of sulfur and oxygen on the surface. TPD was then used to monitor the m/z 20, 19, and 18 signal intensity as a function of the temperature. To quantify the reactivity of water on the surface, activation energies of desorption were obtained. The results indicate distinct differences in the desorption spectra and desorption energies that exemplify the reactivity of each of the surfaces.
1. Wang F, Di Valentin C, Pacchioni G (2012) J Phys Chem C 116:8901–8909