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The magnetite Fe3O4(001) surface exhibits a (√2x√2)R45° reconstruction over a wide range of preparation parameters. Using a combination of STM, LEED-IV, and DFT, the structure was determined as being due to ordered subsurface cation vacancies. This surface renders preferred adsorption sites for metal adatoms up to a temperature where the surface reconstruction is lifted by an order-disorder transition, i.e., around 700 K . Vapor-deposition of metals results in ordered arrays of isolated adatoms that can serve as ideal model systems for single-atom catalysis. Originally observed for Au, Pd , and Ag, adatom arrays that are stable up to 700 K were recently confirmed for a wide range of other elements. Metals that form a stable ferrite structure such as Zr, Ni, Co, Mn, or Ti also adsorb at the special sites within the reconstruction, but diffuse into the selvedge upon annealing. The chemical reactivity of the clean surface, and of the surface modified with small clusters and adatoms will be discussed in the talk.
Who is she?
Ulrike Diebold received her PhD degree in engineering physics in 1990 from the University of Technology (TU Wien) in Vienna, Austria. After working as a post-doc with Prof. Ted Madey at Rutgers University in New Jersey, she joined the faculty at Tulane University, New Orleans, U.S.A. There she climbed through the academic ranks and ultimately held the Yahoo! Founder Chair in Science and Engineering until 2010, when she returnd to her alma mater in Vienna, where she holds a full professorship at the Institute of Applied Physics.
Diebold conducts research in experimental surface science with an emphasis on metal oxide surfaces. She has pioneered the use of atomically-resolved Scanning Tunneling Microscopy to study defects and defect-related surface chemistry. She has published close to 200 peer-reviewed articles, and has given over 250 invited talks including several named lectures. Her articles have been cited more than 13,000 times, and currently the ISI lists her with an h-index of 53.
Diebold serves on several editorial and other advisory boards and is currently a divisional associate editor of the journal Physical Review Letters. She has been elected Fellow of AVS, APS, and AAAS, and is a member of the Austrian, the German, and the European Academy of Sciences. She is a recipient of several international awards, most recently an Advanced Research Grant from the European Research Council, the Adamson Award of the American Chemical Society, the Blaise Pascal Medal in Materials Science, and the Wittgenstein Prize, the highest science award in Austria.
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