Cluster based materials: Novel nanomaterials with distinct size dependent chemical and physical properties

PHYS 127

Stefan Vajda, vajda@anl.gov1, Sungsik Lee1, Yu Lei2, Larry A. Curtiss3, Jeffrey P. Greeley, jgreeley@anl.gov4, Paul C. Redfern1, Michael J. Pellin5, Byeongdu Lee, blee@aps.anl.gov6, Sönke Seifert6, Randall E. Winans, rewinans@anl.gov6, Jeffrey W. Elam7, Armin Kleibert8, Kristian Sell8, Viola von Oeynhausen8, Karl-Heinz Meiwes-Broer8, Arantxa Fraile-Rodríguez9, Bjork Hammer10, Luis M. Molina11, Maria J. López11, and Julio M. Alonso11. (1) Chemical Sciences and Engineering Division & Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Bldg 200, Argonne, IL 60439, (2) Chemical Sciences and Engineering Division, Argonne National Laboratory and University of Illinois at Chicago, 9700 South Cass Avenue, Argonne, IL 60439, (3) Materials Science, Chemical Sciences and Engineering Divisions and Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439, (4) Center for Nanoscale Materials, Argonne National Laboratory, 9700 S Cass Ave, Argonne, IL 60439, (5) Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439, (6) X-ray Science Division, Argonne National Laboratory, Building 433E006, 9700 South Cass Avenue, Argonne, IL 60439, (7) Material Science Division, Argonne National Laboratory, Argonne, IL 60439, (8) Fachbereich Physik, Universität Rostock, Universitätsplatz 3, Rostock, D-18051, Germany, (9) Swiss Light Source, Paul Scherrer Institut, Villigen PSI, CH-5232, Switzerland, (10) INano and Department of Physics and Astronomy, University of Aarhus, Ny Munkegade 1520, Aarhus, DK-8000, Denmark, (11) Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, Facultad de Ciencias, Valladolid, E-47011, Spain
The chemical and physical properties of cluster-based nanomaterials are studied. Size-selected gold and silver clusters supported on technologically relevant oxide surfaces and covering the sub-nanometer to several tens of nanometer particle size range exhibit strongly size- and temperature dependent catalytic properties when tested under realistic reaction conditions in epoxidation reactions. The presented results address, by employing in situ experimental techniques, the size/composition/structure & function relationship at the nanoscale. A molecular level understanding of the underlying processes is provided by high level computations and modeling. The size-and shape dependent UV-VIS properties of 1-3 nm size gold particles will be discussed in terms of coupling size-dependent chemical and optical properties with a potential use in photochemistry.
 

Spectroscopy, Chemistry, and Imaging through Nanophotonics
8:20 AM-12:00 PM, Monday, April 7, 2008 Morial Convention Center -- Rm. 340/341, Oral

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008