Manipulation and patterning of surface hydrogen concentration on Pd(111) by electric fields

COLL 66

Toshiyuki Mitsui1, Evgueni Fomin1, D. Frank Ogletree, ogletree@lbl.gov1, Anand U. Nilekar2, Manos Mavrikakis, manos@engr.wisc.edu2, and Miguel Salmeron1. (1) Materials Sciences Division, Lawrence Berkeley National Laboratory, MS 66-200, One Cyclotron Road, Berkeley, CA 94720, (2) Department of Chemical & Biological Engineering, University of Wisconsin, Madison, WI 53706-1691
We show how the concentration and spatial distribution of hydrogen atoms on Pd(111) can be controllably manipulated with nanometer resolution. Using the electric field of a Scanning Tunneling Microscope tip, we can write and erase concentration patterns of hydrogen, and force hydrogen atoms into subsurface sites. First-Principles DFT calculations explain the phenomena on the basis of field-dependent changes in the binding energy of H in both surface and subsurface layers. The ability to locally modify the surface concentration of adsorbates opens the possibility of patterning surface reactivity on a nanometer scale
 

Dynamics of Single Atoms, Molecules and Clusters on Surfaces
2:00 PM-5:00 PM, Sunday, 10 September 2006 Sir Francis Drake -- Renaissance Room, Oral

Division of Colloid & Surface Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006