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  Exploring the binding mechanisms and physical properties of Pd and Au atoms over thin-film SiO2/Ru(0001) supports

Kaden, W., Büchner, C., Lichtenstein, L., Stuckenholz, S., Ringleb, F., Heyde, M., et al. (2014). Exploring the binding mechanisms and physical properties of Pd and Au atoms over thin-film SiO2/Ru(0001) supports. Abstracts of Papers of the American Chemical Society, 247: Phys 413. Retrieved from http://acselb-529643017.us-west-2.elb.amazonaws.com/chem/247nm/program/lookup_view.php?word=Kaden&where=authors&return=%2Fchem%2F247nm%2Fprogram%2Fauthorindex.php%3Fnum%3D10.

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 Creators:
Kaden, William1, Author              
Büchner, Christin1, Author              
Lichtenstein, Leonid1, Author              
Stuckenholz, Stefanie1, Author              
Ringleb, Franziska1, Author              
Heyde, Markus1, Author              
Sterrer, Martin1, Author              
Freund, Hans-Joachim1, Author              
Giordano, Livia2, Author
Pacchioni, Gianfranco2, Author
Nelin, Connie J.3, Author
Bagus, Paul S.3, Author
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Department of Science and Material, University of Milan-Bicocca, Milan, Italy, ou_persistent22              
3Department of Chemistry, University of North Texas, Denton, Texas 76203, United States , ou_persistent22              

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 Abstract: Adsorption of Au and Pd over bilayer SiO2/Ru(0001) has been investigated using scanning-probe microscopy, x-ray photoemission spectroscopy (XPS), and theory. Low-temperature (∼5K) atomic-force (AFM) and scanning-tunneling microscopy (STM) measurements reveal small adsorption features after exposing the samples to small doses of either metal. For Pd, we note a homogeneous distribution of adsorbates across the surface, which consists of both amorphous and crystalline SiO2 phases. By contrast, Au only adsorbs over amorphous areas and domain boundaries, which posses larger pores than can be found in the ordered portions of the film. Density functional theory (DFT) calculations reveal that this discrepancy is rooted in the pore-size-dependent barriers for diffusion of the two metals into the openings within the film, where they can then bind stably at the Ru interface. Auger parameter analysis of the Pd 3d and Au 4f orbitals from atoms binding in this manner show upward core-level-shifts, which theoretical calculations suggest originate from effects similar to those causing surface core-level-shifts for such metals. Further analysis of the computational results shows that such atoms actually donate electron density to the support, which is consistent with XPS results that show decreases in the work-function of the sample after adsorbing either metal. Additional features in the XPS studies suggest that a secondary binding mechanism, mediated by cluster formation over the SiO2 film, becomes increasingly favorable as temperature and loading increases.

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Language(s): eng - English
 Dates: 2014-03-162014
 Publication Status: Published in print
 Pages: 1
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Title: Abstracts of Papers of the American Chemical Society
  Abbreviation : Abstr. Pap. Am. Chem. S.
Source Genre: Journal
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Pages: - Volume / Issue: 247 Sequence Number: Phys 413 Start / End Page: - Identifier: Other: 0065-7727
CoNE: https://pure.mpg.de/cone/journals/resource/954928522856