AVS 49th International Symposium
    Surface Science Tuesday Sessions
       Session SS3-TuM

Invited Paper SS3-TuM1
Effects of Cluster Size and Deposition Energy on Adsorption and Sintering Behavior of Metal Nanoclusters on Oxide Supports

Tuesday, November 5, 2002, 8:20 am, Room C-112C

Session: Metals, Adsorbates, and Defects on TiO@sub 2@
Presenter: S.L. Anderson, University of Utah
Authors: M. Aizawa, University of Utah
S. Lee, University of Utah
J. Lee, Seoul National University, Korea
S.L. Anderson, University of Utah
Correspondent: Click to Email
Size-selected metal nanoclusters on oxide supports are prepared by deposition of pre-formed, mass-selected cluster ions, allowing impact energy to be varied over a wide range. The samples thus prepared, are probed by a combination of XPS, AES, ISS, and TPD, providing insight into changes in oxidation state, morphology, and chemical behavior, induced by varying deposition conditions, thermal processing, and exposure to adsorbates. Results will be presented for Ni@sub n@ and Ir@sub n@ on TiO@sub 2@. In both cases, the clusters appear to be stable with respect to breakup or sintering for a range of deposition energies on room temperature substrates. Significant morphology changes are observed following exposure to adsorbates. Both the adsorbate interation strengths and morphology changes are strongly size dependent.