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  Ultrathin silica films on Pd(111): Structure and adsorption properties

Tissot, H., Weng, X., Schlexer, P., Pacchioni, G., Shaikhutdinov, S. K., & Freund, H.-J. (2018). Ultrathin silica films on Pd(111): Structure and adsorption properties. Surface Science, 678, 118-123. doi:10.1016/j.susc.2018.02.016.

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Tissot SiO2 Pd(111) final.pdf (Any fulltext), 865KB
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Tissot SiO2 Pd(111) final.pdf
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2018
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Elsevier
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 Creators:
Tissot, Heloise1, Author           
Weng, Xuefei1, Author           
Schlexer, Philomena2, Author
Pacchioni, Gianfranco2, Author
Shaikhutdinov, Shamil K.1, Author           
Freund, Hans-Joachim1, Author           
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy, ou_persistent22              

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 Abstract: We studied the preparation of thin silica films on Pd(111) using low energy electron diffraction (LEED), infrared reflection-absorption spectroscopy (IRAS), and scanning tunneling microscopy (STM). The films grow from the onset as a double-layer (bilayer) silicate and show no long-range ordering as judged by LEED, thus bearing close similarities to the silicate films grown on a Pt(111) support. The results provide further evidence that the principal structure (monolayer vs bilayer) of ultrathin silica films on metal substrates is primarily governed by the affinity of a metal substrate to oxygen. Individual adsorption of CO and D2 on the prepared films showed that both molecules penetrate through the film and chemisorb on the Pd(111) surface. Density functional theory (DFT) calculations showed that CO bonding on Pd(111) underneath the silica film becomes weaker as compared to the bare Pd(111) surface, but the vibrational frequencies remain unaffected, that is in nice agreement with the experimental results.

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Language(s): eng - English
 Dates: 2018-02-282017-12-122018-02-282018-03-012018-12
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.susc.2018.02.016
 Degree: -

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Title: Surface Science
  Abbreviation : Surf. Sci.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: 6 Volume / Issue: 678 Sequence Number: - Start / End Page: 118 - 123 Identifier: Other: 0039-6028
CoNE: https://pure.mpg.de/cone/journals/resource/0039-6028