English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  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.

Item is

Files

show Files

Locators

show

Creators

show
hide
 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              

Content

show
hide
Free keywords: -
 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.

Details

show
hide
Language(s): eng - English
 Dates: 2014-03-162014
 Publication Status: Issued
 Pages: 1
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Abstracts of Papers of the American Chemical Society
  Abbreviation : Abstr. Pap. Am. Chem. S.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 247 Sequence Number: Phys 413 Start / End Page: - Identifier: Other: 0065-7727
CoNE: https://pure.mpg.de/cone/journals/resource/954928522856