AVS 46th International Symposium
    Surface Science Division Monday Sessions
       Session SS1+EM-MoM

Paper SS1+EM-MoM2
S Adsorption on TiO@sub 2@(110) Studied with STM, XPS and LEED

Monday, October 25, 1999, 8:40 am, Room 606

Session: Chemistry on Oxides
Presenter: E.L.D. Hebenstreit, Tulane University
Authors: E.L.D. Hebenstreit, Tulane University
W. Hebenstreit, Tulane University
U. Diebold, Tulane University
Correspondent: Click to Email
TiO@sub 2@ surfaces are well-known for their catalytic properties. Since sulfur is known as a catalyst inhibitor, its adsorption behavior on TiO@sub 2@ single crystal surfaces are of great interest. Measurements with a scanning tunneling microscope reveal the existence of two different adsorption sites, depending on the sample temperature during adsorption. Adsorption at room temperature leads to very mobile sulfur atoms sitting on titanium sites of TiO@sub 2@(110). Adsorption at 300°C causes the formation of more stable sulfur chains running along the [1-10] direction with an ordered (3x1) structure at saturation. In the latter case the sulfur atoms are located at the positions of oxygen surface atoms. X-ray-photoelectron-spectroscopy confirms the existence of two chemically different S species.