The stability of CuO and Cu2O surfaces during argon sputtering studied by XPS and AES

Panzner, G.; Egert, B.; Schmidt, Harald

doi:10.1016/0039-6028(85)90383-8

Cited by 211 publications

(101 citation statements)

References 11 publications

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“…Starting from the standard spectrum from the pristine CuO powder, both the binding and satellites were fitted to two peaks. The peak position at 933.4 eV is attributed to the covalent part of Cu 2+ binding in the CuO phase [38,42,44], and the other peak at 934.9 eV is due to the ionic Cu 2+ binding [45,46]. This is in excellent agreement with well-documented literature reports that there exist two kinds of Cu 2+ binding in pristine CuO.…”

Section: Xps Analysissupporting

confidence: 88%

“…It is noted that each spectrum is nearly the same as that of pristine CuO powder, which suggests that the monoclinic CuO phase dictates the microstructures of all of the thin films deposited with different levels of oxygen in the sputtering gas. The presence of a series of satellite peaks is characteristic of CuO which has a d 9 configuration in the ground state [42][43][44][45]. Furthermore, the energetic difference (DE) between the E Cu2p3/2 and E Cu2p1/2 peaks is 20 ± 0.1 eV, which is in good agreement with literature data.…”

Section: Xps Analysissupporting

confidence: 87%

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Role of materials chemistry on the electrical/electronic properties of CuO thin films

et al. 2015

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Section: Xps Analysissupporting

confidence: 88%

Section: Xps Analysissupporting

confidence: 87%

Role of materials chemistry on the electrical/electronic properties of CuO thin films

et al. 2015

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“…The surface spectra differ from those further down in the coating and agree well with references of CuO [33]. The spectra obtained from inside of the coating are less oxidized, but due to potential sputter damage on CuO [34] the oxidation state of the Cu cannot be determined. However, the presence of CuO is expected since Cu 2 O preferentially forms at relatively low temperatures [35].…”

Section: Heat Treatmentsupporting

confidence: 71%

Ni and Ti diffusion barrier layers between Ti–Si–C and Ti–Si–C–Ag nanocomposite coatings and Cu-based substrates

Sarius

Lauridsen

Lewin

et al. 2012

Surface and Coatings Technology

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Sputtered Ni and Ti layers were investigated as a diffusion barrier to substitute electroplated Ni between Ti-Si-C and Ti-Si-C-Ag nanocomposite coatings and Cu or CuSn substrates. Samples were subjected to thermal annealing studies by exposure to 400 ºC for 11 h. Dense diffusion barrier and coating hindered Cu from diffusing to the surface. This condition was achieved for electroplated Ni in combination with magnetron-sputtered TiSi-C and Ti-Si-C-Ag layers deposited at 230 ºC and 300 ºC, and sputtered Ti or Ni layers in combination with Ti-Si-C-Ag deposited at 300 ºC.

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“…Among them are oxygen adsorbed at the copper surface, which gives the rise to an O1s feature at 529.7 eV, copper(I) oxide (530.4 eV), copper(II) oxide (529.6 eV), methoxy-(530.2 ± 0.2 eV) and formate-groups (531.4 ± 0.2 eV) [22,[56][57][58][59]. Selection between these species requires analysis of a whole set of XPS spectra: not only O1s and Cu2p, but also C1s and CuLVV Auger spectra should be analyzed.…”

Section: Methanol Oxidation Over Coppermentioning

confidence: 99%

X-ray photoelectron spectroscopy as a tool for in-situ study of the mechanisms of heterogeneous catalytic reactions

2005

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An ESCALAB High Pressure photoelectron spectrometer specially designed by Vacuum Generators Co. (UK) for in-situ measurements at high pressures has been modified for adsorption and catalytic experiments. New construction of a gas cell, which serves to create a high-pressure zone, allows us to measure photoemission spectra in-situ at pressures up to 0.2-0.5 mbar and to use a sample holder with independent heating of a sample. This makes it possible to measure temperature programmed desorption and reaction spectra and, as a consequence, to characterize the catalytic properties simultaneously with the acquisition of X-ray photoelectron spectroscopy (XPS) data. Capabilities of the modified spectrometer are demonstrated by the examples of studies of CO and methanol adsorption on Pd(111) single crystal and methanol oxidation over Cu poly .The XPS study of high-pressure adsorption of CO on perfect and sputtered Pd (111) showed that raising the pressure has the same effect as decreasing the temperature. The CO coverage is increased due to adsorption of CO to weakly bound (on-top) state, which appears in addition to more strongly bound three-fold and bridged species. No indications of CO dissociation or carbonyl formation were found under the given experimental conditions (high pressure and sputtering-induced defects), provided that the CO gas was sufficiently clean.Two pathways of methanol decomposition to CH x,ads (x 3) and to CO ads was unambiguously identified, with their contribution being dependent on P and T. The decomposition to carbon-originated species had a small contribution in UHV conditions at room temperature, but became more significant at higher pressures and temperatures.Analysis of the distribution of the reaction products and surface species during methanol oxidation over copper in the submillibar pressure range showed that an increase in catalytic activity observed on heating the sample from 420 to 670 K is accompanied by transformation of the adlayer composition. At low temperatures, the surface is covered by methoxy-and, to a lesser extent, formate-groups. The active surface (T > 520 K) is metallic copper with two adsorbed oxygen species. The possible nature of these species is discussed.

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The stability of CuO and Cu2O surfaces during argon sputtering studied by XPS and AES

Cited by 211 publications

References 11 publications

Role of materials chemistry on the electrical/electronic properties of CuO thin films

Role of materials chemistry on the electrical/electronic properties of CuO thin films

Ni and Ti diffusion barrier layers between Ti–Si–C and Ti–Si–C–Ag nanocomposite coatings and Cu-based substrates

X-ray photoelectron spectroscopy as a tool for in-situ study of the mechanisms of heterogeneous catalytic reactions

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