Surface enrichment of Pt in Ga2O3 films grown on liquid Pt/Ga alloys

Journal article
(Original article)


Publication Details

Author(s): Grabau M, Krick Calderon S, Rietzler F, Niedermaier I, Taccardi N, Wasserscheid P, Maier F, Steinrück HP, Papp C
Journal: Surface Science
Publisher: Elsevier
Publication year: 2016
Volume: 651
Pages range: 16-21
ISSN: 0039-6028


Abstract


The formation of surface GaO films on liquid samples of Ga, and Pt-Ga alloys with 0.7 and 1.8 at.% Pt was examined using near-ambient pressure (NAP) X-ray photoelectron spectroscopy (XPS). Thickness, composition and growth of the oxide films were deduced as a function of temperature and Pt content of the alloys, in ultra-high vacuum and at oxygen pressures of 3 × 10, 3 × 10 and 1 mbar. We examined oxide layers up to a thickness of 37 Å. Different growth modes were found for oxidation at low and high pressures. The formed GaO oxide films showed an increased Pt content, while the pristine GaPt alloy showed a surface depletion of Pt at the examined temperatures. Upon growth of GaO on Pt/Ga alloys a linear increase of Pt content was observed, due to the incorporation of 3.6 at.% Pt in the GaO. The Pt content in GaO, at the examined temperatures and bulk Pt concentrations is found to be independent of pressure, temperature and the nominal Pt content of the metallic alloy.



FAU Authors / FAU Editors

Grabau, Mathias Dr.
Lehrstuhl für Physikalische Chemie II
Krick Calderon, Sandra
Lehrstuhl für Physikalische Chemie II
Maier, Florian Dr.
Lehrstuhl für Physikalische Chemie II
Niedermaier, Inga
Lehrstuhl für Physikalische Chemie II
Papp, Christian PD Dr.
Lehrstuhl für Physikalische Chemie II
Rietzler, Florian
Lehrstuhl für Physikalische Chemie II
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II
Taccardi, Nicola Dr.
Lehrstuhl für Chemische Reaktionstechnik
Wasserscheid, Peter Prof. Dr.
Lehrstuhl für Chemische Reaktionstechnik


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Grabau, M., Krick Calderon, S., Rietzler, F., Niedermaier, I., Taccardi, N., Wasserscheid, P.,... Papp, C. (2016). Surface enrichment of Pt in Ga2O3 films grown on liquid Pt/Ga alloys. Surface Science, 651, 16-21. https://dx.doi.org/10.1016/j.susc.2016.03.009

MLA:
Grabau, Mathias, et al. "Surface enrichment of Pt in Ga2O3 films grown on liquid Pt/Ga alloys." Surface Science 651 (2016): 16-21.

BibTeX: 

Last updated on 2018-05-10 at 21:50