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Title: Decomposition of NO[sub 2] on metal surfaces: Oxidation of Ag, Zn, and Cu films

Abstract

The dissociation probability of O[sub 2] on Cu(111), Ag(111), and Zn(001) surfaces is quite low ([lt]10[sup [minus]2]). The oxidation process using molecular oxygen is not practical for work under ultrahigh vacuum conditions. We have found that NO[sub 2] is a very good oxygen source for the oxidation of Ag, Zn, and Cu surfaces. At elevated temperatures (300--500 K), the dissociation probability of NO[sub 2] on thick Ag, Zn, and Cu films supported on Ru(001) is close to one. The decomposition of NO[sub 2] produces a large amount of adsorbed oxygen and gaseous NO and N[sub 2]. The thermal stability and electronic properties of the O/Ag, ZnO[sub [ital x]], and CuO[sub [ital x]] films were examined using temperature desorption spectroscopy, x-ray photoelectron spectroscopy (XPS), and x-ray Auger electron spectroscopy. Large amounts of oxygen can be adsorbed and dissolved in Ag films without oxidation of the noble metal. The zinc oxide films displayed the typical O 1[ital s] XPS and Zn [ital L][sub 3][ital M][sub 4,5][ital M][sub 4,5] Auger spectra of polycrystalline ZnO. In addition, the high-resolution electron energy-loss spectroscopy spectra of these films exhibited the characteristic phonon losses of bulk ZnO. In the case of Cu films the NO[sub 2]-oxidation leadsmore » to the formation of a mixture of CuO and Cu[sub 2]O. The CuO species is relatively unstable and can be reduced to Cu[sub 2]O by annealing at 700 K (2 CuO[r arrow]Cu[sub 2]O+1/2O[sub 2]) or by direct reaction with metallic Cu at 300 K (CuO+Cu[r arrow]Cu[sub 2]O).« less

Authors:
;  [1]
  1. Chemistry Department 555, Brookhaven National Laboratory, P. O. Box 5000, Upton, New York 11973-5000 (United States)
Publication Date:
OSTI Identifier:
7084654
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)
Additional Journal Information:
Journal Volume: 12:4; Journal ID: ISSN 0734-2101
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COPPER; OXIDATION; NITROGEN OXIDES; DECOMPOSITION; SILVER; ZINC; ELECTRONIC STRUCTURE; FILMS; STABILITY; SURFACES; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; CHALCOGENIDES; CHEMICAL REACTIONS; ELEMENTS; METALS; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENTS; 400201* - Chemical & Physicochemical Properties

Citation Formats

Rodriguez, J A, and Hrbek, J. Decomposition of NO[sub 2] on metal surfaces: Oxidation of Ag, Zn, and Cu films. United States: N. p., 1994. Web. doi:10.1116/1.579151.
Rodriguez, J A, & Hrbek, J. Decomposition of NO[sub 2] on metal surfaces: Oxidation of Ag, Zn, and Cu films. United States. https://doi.org/10.1116/1.579151
Rodriguez, J A, and Hrbek, J. 1994. "Decomposition of NO[sub 2] on metal surfaces: Oxidation of Ag, Zn, and Cu films". United States. https://doi.org/10.1116/1.579151.
@article{osti_7084654,
title = {Decomposition of NO[sub 2] on metal surfaces: Oxidation of Ag, Zn, and Cu films},
author = {Rodriguez, J A and Hrbek, J},
abstractNote = {The dissociation probability of O[sub 2] on Cu(111), Ag(111), and Zn(001) surfaces is quite low ([lt]10[sup [minus]2]). The oxidation process using molecular oxygen is not practical for work under ultrahigh vacuum conditions. We have found that NO[sub 2] is a very good oxygen source for the oxidation of Ag, Zn, and Cu surfaces. At elevated temperatures (300--500 K), the dissociation probability of NO[sub 2] on thick Ag, Zn, and Cu films supported on Ru(001) is close to one. The decomposition of NO[sub 2] produces a large amount of adsorbed oxygen and gaseous NO and N[sub 2]. The thermal stability and electronic properties of the O/Ag, ZnO[sub [ital x]], and CuO[sub [ital x]] films were examined using temperature desorption spectroscopy, x-ray photoelectron spectroscopy (XPS), and x-ray Auger electron spectroscopy. Large amounts of oxygen can be adsorbed and dissolved in Ag films without oxidation of the noble metal. The zinc oxide films displayed the typical O 1[ital s] XPS and Zn [ital L][sub 3][ital M][sub 4,5][ital M][sub 4,5] Auger spectra of polycrystalline ZnO. In addition, the high-resolution electron energy-loss spectroscopy spectra of these films exhibited the characteristic phonon losses of bulk ZnO. In the case of Cu films the NO[sub 2]-oxidation leads to the formation of a mixture of CuO and Cu[sub 2]O. The CuO species is relatively unstable and can be reduced to Cu[sub 2]O by annealing at 700 K (2 CuO[r arrow]Cu[sub 2]O+1/2O[sub 2]) or by direct reaction with metallic Cu at 300 K (CuO+Cu[r arrow]Cu[sub 2]O).},
doi = {10.1116/1.579151},
url = {https://www.osti.gov/biblio/7084654}, journal = {Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)},
issn = {0734-2101},
number = ,
volume = 12:4,
place = {United States},
year = {1994},
month = {7}
}