IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Tuesday Sessions
       Session SS-TuA

Paper SS-TuA7
Characterization of Surface Defects on Flat and Porous MgO Surfaces

Tuesday, October 30, 2001, 4:00 pm, Room 121

Session: Metal Oxides: Structure and Photocatalysis
Presenter: Z. Dohnálek, Pacific Northwest National Laboratory
Authors: Z. Dohnálek, Pacific Northwest National Laboratory
D. McCready, Pacific Northwest National Laboratory
J.S. Young, Pacific Northwest National Laboratory
A. Dohnálková, Pacific Northwest National Laboratory
G.A. Kimmel, Pacific Northwest National Laboratory
R.S. Smith, Pacific Northwest National Laboratory
B.D. Kay, Pacific Northwest National Laboratory
Correspondent: Click to Email
We use the physisorption of gases such as N@sub 2@, Ar, and CO and standard surface analytical techniques to characterize the surface defects on thin films of dense and porous MgO. Different types of defects are prepared on the MgO films by careful adjustment of the deposition conditions. Significant changes are observed on the surfaces of films grown on the Mo(100) substrate at various substrate temperatures, O@sub 2@ pressures, deposition rates, and film thicknesses. Temperature programmed desorption (TPD) of physisorbed molecules reveals distinct desorption features associated with different binding sites on the defective films. The analysis of TPD spectra yields the binding energies and concentrations of these defect sites. The information from flat MgO(100) surfaces is utilized in the characterization of porous, crystalline MgO films. Details of the experimental techniques, results, and implications of the results will be presented. @FootnoteText@ Pacific Northwest National Laboratory is operated for the Department of Energy by Battelle under Contract DE-AC06-76RLO 1830.