| AVS 57th International Symposium & Exhibition | |
| Surface Science | Tuesday Sessions |
| Session SS1-TuM |
| Session: | Catalysis on Metal and Alloy Surfaces |
| Presenter: | S.M. Russell, Iowa State University |
| Authors: | S.M. Russell, Iowa State University M. Shen, Iowa State University C.J. Jenks, Ames Laboratory, US-DOE D.-J. Liu, Ames Laboratory, US-DOE P.A. Thiel, Iowa State University & Ames Laboratory, US-DOE |
| Correspondent: | Click to Email |
Sulfur adsorption on Ag(100) is the object of this investigation because sulfur affects reshaping and decay of Ag nanostructures on this, and other, surfaces. We have studied sulfur on Ag(100) using STM. Consistent with prior LEED work [1-2], we find two structures that coexist at room temperature: a p(2x2) chemisorbed phase, and a (√17x√17)R14o reconstruction, the latter being the phase with higher sulfur coverage. As sulfur coverage increases, sulfur atoms replace Ag in the surface plane to form the √17, resulting in ejection of Ag and development of √17 islands on the terraces. DFT supports a model in which 5 Ag atoms are ejected per unit cell. In STM, the dominant local motif of the √17 reconstruction consists of rectangular groups of (primarily) four sulfur atoms, very similar to sulfur on Cu(100) in the √17 phase [3]. At room temperature, the √17 islands are dynamic, and can develop extensions of disordered material that link and island, transiently, to another √17 island or domain.
References
[1] G. Rovida and F. Pratesi, Surf. Sci. 104(2-3), 609 (1981).
[2] M. P. Sotto and J. C. Boulliard, Surf. Sci. 162(1-3), 285 (1985).
[3] M. L. Colaianni and I. Chorkendorff, Phys. Rev. B 50(12), 8798 (1994).