AVS 49th International Symposium
    Surface Science Tuesday Sessions
       Session SS1-TuA

Invited Paper SS1-TuA6
Kinetics and Dynamics of CO Oxidation on Oxygen Precovered Gold Nanoclusters Supported on Titania

Tuesday, November 5, 2002, 3:40 pm, Room C-108

Session: Ultrafast Phenomena & Dynamics at Surfaces
Presenter: C.B. Mullins, University of Texas at Austin
Authors: C.B. Mullins, University of Texas at Austin
T.S. Kim, University of Texas at Austin
J. Stiehl, University of Texas at Austin
C.T. Reeves, University of Texas at Austin
R.J. Meyer, University of Texas at Austin
Correspondent: Click to Email
Studies of the kinetics and dynamics of carbon monoxide oxidation have been carried out on a titania single crystal surface with a (110) orientation and decorated with gold nanoclusters. The investigations employed molecular beam surface scattering techniques as well as thermal desorption mass spectrometry and Auger electron spectroscopy. An rf-powered plasma jet source was used to create a beam of atomic oxygen which was used to populate the surface with oxygen adatoms. After the surface was prepared a molecular beam of carbon monoxide was directed at the surface in order to study oxidation of CO as a function of oxygen coverage and surface temperature. There is a maximum in the reactivity as a function of oxygen coverage and surface temperature. Competing processes, such as adsorption and desorption, will be discussed as well as the effect of adsorbed oxygen upon the surface reactivity of the gold nanoclusters.