A study of the O/Ag(111) system with scanning tunneling microscopy and x-ray photoelectron spectroscopy at ambient pressures

Christian Heine; Baran Eren; Barbara A. J. Lechner; Miquel Salmeron

doi:https://doi.org/10.1016/j.susc.2016.02.012

A study of the O/Ag(111) system with scanning tunneling microscopy and x-ray photoelectron spectroscopy at ambient pressures

Christian Heine, Baran Eren, Barbara A. J. Lechner, Miquel Salmeron

Research output: Contribution to journal › Article › peer-review

Abstract

The interaction of O₂ with the Ag(111) surface was studied with scanning tunneling microscopy (STM) in the pressure range from 10^− 9 Torr to 1 atm at room temperature and with X-ray photoelectron spectroscopy (XPS) up to 0.3 Torr O₂ in the temperature range from RT to 413 K. STM images show that the Ag(111) surface topography is little affected in regions with large flat terraces, except for the appearance of mobile features due to oxygen atoms at pressures above 0.01 Torr. In regions where the step density is high, the surface became rough under 0.01 Torr of O₂, due to the local oxidation of Ag. Various chemical states of oxygen due to chemisorbed, oxide and subsurface species were identified by XPS as a function of pressure and temperature. The findings from the STM images and XPS measurements indicate that formation of an oxide phase, the thermodynamically stable form at room temperature under ambient O₂ pressure, is kinetically hindered in the flat terrace areas but proceeds readily in regions with high-step density.

Original language	English
Pages (from-to)	51-57
Number of pages	7
Journal	Surface Science
Volume	652
DOIs	https://doi.org/10.1016/j.susc.2016.02.012
State	Published - 1 Oct 2016
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Materials Chemistry
Surfaces, Coatings and Films
Surfaces and Interfaces

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https://doi.org/10.1016/j.susc.2016.02.012

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title = "A study of the O/Ag(111) system with scanning tunneling microscopy and x-ray photoelectron spectroscopy at ambient pressures",

abstract = "The interaction of O2 with the Ag(111) surface was studied with scanning tunneling microscopy (STM) in the pressure range from 10− 9 Torr to 1 atm at room temperature and with X-ray photoelectron spectroscopy (XPS) up to 0.3 Torr O2 in the temperature range from RT to 413 K. STM images show that the Ag(111) surface topography is little affected in regions with large flat terraces, except for the appearance of mobile features due to oxygen atoms at pressures above 0.01 Torr. In regions where the step density is high, the surface became rough under 0.01 Torr of O2, due to the local oxidation of Ag. Various chemical states of oxygen due to chemisorbed, oxide and subsurface species were identified by XPS as a function of pressure and temperature. The findings from the STM images and XPS measurements indicate that formation of an oxide phase, the thermodynamically stable form at room temperature under ambient O2 pressure, is kinetically hindered in the flat terrace areas but proceeds readily in regions with high-step density.",

author = "Christian Heine and Baran Eren and Lechner, {Barbara A. J.} and Miquel Salmeron",

note = "Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC), an Energy Frontier Research Center - US Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0012573]; Chemical and Mechanical Properties of Surfaces, Interfaces and Nanostructures program, in the Division of Materials Sciences and Engineering, of the U.S. Department of Energy (DOE) [DE-AC02-05CH11231]; Office of Science of the U.S. DOE [DE-AC02-05CH11231]",

year = "2016",

month = oct,

day = "1",

doi = "https://doi.org/10.1016/j.susc.2016.02.012",

language = "الإنجليزيّة",

volume = "652",

pages = "51--57",

journal = "Surface Science",

issn = "0039-6028",

publisher = "American Association for the Advancement of Science",

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TY - JOUR

T1 - A study of the O/Ag(111) system with scanning tunneling microscopy and x-ray photoelectron spectroscopy at ambient pressures

AU - Heine, Christian

AU - Eren, Baran

AU - Lechner, Barbara A. J.

AU - Salmeron, Miquel

N1 - Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC), an Energy Frontier Research Center - US Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0012573]; Chemical and Mechanical Properties of Surfaces, Interfaces and Nanostructures program, in the Division of Materials Sciences and Engineering, of the U.S. Department of Energy (DOE) [DE-AC02-05CH11231]; Office of Science of the U.S. DOE [DE-AC02-05CH11231]

PY - 2016/10/1

Y1 - 2016/10/1

N2 - The interaction of O2 with the Ag(111) surface was studied with scanning tunneling microscopy (STM) in the pressure range from 10− 9 Torr to 1 atm at room temperature and with X-ray photoelectron spectroscopy (XPS) up to 0.3 Torr O2 in the temperature range from RT to 413 K. STM images show that the Ag(111) surface topography is little affected in regions with large flat terraces, except for the appearance of mobile features due to oxygen atoms at pressures above 0.01 Torr. In regions where the step density is high, the surface became rough under 0.01 Torr of O2, due to the local oxidation of Ag. Various chemical states of oxygen due to chemisorbed, oxide and subsurface species were identified by XPS as a function of pressure and temperature. The findings from the STM images and XPS measurements indicate that formation of an oxide phase, the thermodynamically stable form at room temperature under ambient O2 pressure, is kinetically hindered in the flat terrace areas but proceeds readily in regions with high-step density.

AB - The interaction of O2 with the Ag(111) surface was studied with scanning tunneling microscopy (STM) in the pressure range from 10− 9 Torr to 1 atm at room temperature and with X-ray photoelectron spectroscopy (XPS) up to 0.3 Torr O2 in the temperature range from RT to 413 K. STM images show that the Ag(111) surface topography is little affected in regions with large flat terraces, except for the appearance of mobile features due to oxygen atoms at pressures above 0.01 Torr. In regions where the step density is high, the surface became rough under 0.01 Torr of O2, due to the local oxidation of Ag. Various chemical states of oxygen due to chemisorbed, oxide and subsurface species were identified by XPS as a function of pressure and temperature. The findings from the STM images and XPS measurements indicate that formation of an oxide phase, the thermodynamically stable form at room temperature under ambient O2 pressure, is kinetically hindered in the flat terrace areas but proceeds readily in regions with high-step density.

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U2 - https://doi.org/10.1016/j.susc.2016.02.012

DO - https://doi.org/10.1016/j.susc.2016.02.012

M3 - مقالة

SN - 0039-6028

VL - 652

SP - 51

EP - 57

JO - Surface Science

JF - Surface Science

ER -

A study of the O/Ag(111) system with scanning tunneling microscopy and x-ray photoelectron spectroscopy at ambient pressures

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