AVS 46th International Symposium
    Surface Science Division Tuesday Sessions
       Session SS-TuP

Paper SS-TuP2
Growth Mode of Au on SiO@sub 2@ Ultrathin Film

Tuesday, October 26, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: K. Luo, Texas A&M University
Authors: K. Luo, Texas A&M University
D.Y. Kim, Hallym University, Korea
D.W. Goodman, Texas A&M University
Correspondent: Click to Email
Au clusters supported on SiO@sub 2@/Mo(110) have been studied by x-ray photoemission spectroscopy(XPS), low energy ion scattering(LEIS), temperature programmed desorption(TPD) and low energy electron diffraction(LEED). At both 100 K and 300 K, the growth mode of Au at fractional monolayer coverages is quasi-two dimensional. With higher coverages, three dimensional growth of Au was found. No strong chemical interaction was observed between gold and silica. By annealing Au/SiO@sub 2@/Mo(110) to 1000 K, sintering of gold clusters was observed. The Au desorption activation energy was measured by temperature programmed desorption to be about 42 kcal/mol, lower than the sublimation energy of 90 kcal/mol for bulk gold.