Monatomic Co, CoO2, and CoO3 nanowires on Ir(100) and Pt(100) surfaces: Formation, structure, and energetics

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Ferstl P, Mittendorfer F, Redinger J, Schneider MA, Hammer L
Zeitschrift: Physical Review B
Verlag: AMER PHYSICAL SOC
Jahr der Veröffentlichung: 2017
Band: 96
Heftnummer: 8
ISSN: 2469-9950


Abstract

In this study, we investigate the structural and chemical changes of monatomic CoO2 chains grown self-organized on the Ir(100) surface [P. Ferstl et al., Phys. Rev. Lett. 117, 046101 (2016)] and on Pt(100) under reducing and oxidizing conditions. By a combination of quantitative low-energy electron diffraction, scanning tunneling microscopy, and density functional theory we show that the cobalt oxide wires are completely reduced by H-2 at temperatures above 320 K and a 3 x 1 ordered Ir2Co or Pt2Co surface alloy is formed. Depending on temperature, the surface alloy on Ir(100) is either hydrogen covered (T < 400 K) or clean and eventually undergoes an irreversible order-disorder transition at about 570 K. The Pt2Co surface alloy disorders with the desorption of hydrogen, whereby Co submerges into subsurface sites. Vice versa, applying stronger oxidants than O-2 such as NO2 leads to the formation of CoO3 chains on Ir(100) in a 3 x 1 superstructure. On Pt(100), such a CoO3 phase could not be prepared so far, which, however, is due to the ultrahigh vacuum conditions of our experiments. As revealed by theory, this phase will become stable in a regime of higher pressure. In general, the structures can be reversibly switched on both surfaces using the respective agents O-2, NO2, and H-2.


FAU-Autoren / FAU-Herausgeber

Ferstl, Pascal
Lehrstuhl für Festkörperphysik
Hammer, Lutz Dr.
Lehrstuhl für Festkörperphysik
Schneider, M. Alexander Prof. Dr.
Professur für Experimentalphysik


Autor(en) der externen Einrichtung(en)
Vienna University of Technology


Zitierweisen

APA:
Ferstl, P., Mittendorfer, F., Redinger, J., Schneider, M.A., & Hammer, L. (2017). Monatomic Co, CoO2, and CoO3 nanowires on Ir(100) and Pt(100) surfaces: Formation, structure, and energetics. Physical Review B, 96(8). https://dx.doi.org/10.1103/PhysRevB.96.085407

MLA:
Ferstl, Pascal, et al. "Monatomic Co, CoO2, and CoO3 nanowires on Ir(100) and Pt(100) surfaces: Formation, structure, and energetics." Physical Review B 96.8 (2017).

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Zuletzt aktualisiert 2018-14-08 um 17:08