X-ray photoelectron spectra of defective nickel oxide

Tomellini, M.

doi:10.1039/f19888403501

Cited by 75 publications

(56 citation statements)

References 5 publications

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“…Finally, it may be concluded that even after surface cleaning and high temperature dehydration the intensity of the peak at ∼531 eV remains comparable with the O 2− -anion peak intensity. This lateral peak may be attributed to low coordinated oxygen [13] and/or to oxygen-deficient regions [22] in the LNO matrix. Unfortunately, the (1), after subsequent Ar + polishing (2), after subsequent super high vacuum annealing (550 • C; 30 h) (3), after subsequent exposure to ambient air for 2 hours (4).…”

Section: Resultsmentioning

confidence: 99%

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Surface stability of epitaxial LaNiO_3-δthin films

Mickevičius¹,

Grebinskij²,

Bondarenka³

et al. 2010

Lithuanian J. Phys.

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Thin LaNiO 3−δ films with pseudocubic (100) preferred orientation were prepared by reactive DC magnetron sputtering and in situ annealed in O2 and vacuum. X-ray photoelectron spectroscopy (XPS) was used to determine the variation in composition of the films under high temperature annealing. The experimental O 1s and La 3d -Ni 2p 3/2 spectra of LaNiO 3−δ films was analysed in terms of O 2− , O − /(OH) − , and weakly adsorbed oxygen species. It was shown that the change in the type of conductivity from metallic to semiconducting one is accompanied by a marked increase in the intensity of the lateral (∼531 eV) peak of oxygen. The quantitative analyses of La 3d -Ni 2p 3/2 spectra show that the Ni/La concentration ratio significantly decreases after heating above the dehydration temperature. These variations in conductivity and surface composition were attributed to the loss of lattice oxygen with subsequent adsorption of O − and (OH) − anions and weakly adsorbed oxygen species from ambient air.

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Section: Resultsmentioning

confidence: 99%

“…The assumption of different valence states for the metal [12] or several final states [13] has been made, but in most cases this structure has been assigned to contamination surface species. The adsorption of (OH) − or CO Jimenez et al [14] attribute the lateral peak to low coordinated oxygen ions at the surface of the samples.…”

Section: Resultsmentioning

confidence: 99%

Surface stability of epitaxial LaNiO_3-δthin films

Mickevičius¹,

Grebinskij²,

Bondarenka³

et al. 2010

Lithuanian J. Phys.

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“…Conventionally P 3 Ni is considered to arise from contribution of trivalent nickel species ͑Ni 3+ , excited 3d states 34,35 having 3d 7 electron configuration͒ due to the deficient nickel oxide. 31,[36][37][38] But it can be assigned to Ni͑OH͒ 2 as well as in Refs. 39 and 40.…”

Section: Pure Nickelmentioning

confidence: 99%

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

et al. 2010

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We report on the ability to modify the structure and composition of ultrathin oxides grown on Ni and Ni-Al alloy surfaces at room temperature utilizing photon illumination. We find that the nickel-oxide formation is enhanced in the case of oxidation under photo-excitation. The enhanced oxidation kinetics of nickel in 5% Ni-Al alloy is corroborated by experimental and simulation studies of natural and photon-assisted oxide growth on pure Ni͑100͒ surfaces. In case of pure Ni substrates, combined x-ray photoelectron spectroscopy analysis, and atomic force microscope current mapping support the deterministic role of the structure of nickel passiveoxide films on their nanoscale corrosion resistance. Atomistic simulations involving dynamic charge transfer predict that the applied electric field overcomes the activation-energy barrier for ionic migration, leading to enhanced oxygen incorporation into the oxide, enabling us to tune the mixed-oxide composition at atomic length scales. Atomic scale control of ultrathin oxide structure and morphology in the case of pure substrates as well as compositional tuning of complex oxide in the case of alloys leads to excellent passivity as verified from potentiodynamic polarization experiments.

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“…These high-binding-energy peaks are frequently attributed to Ni 3C species. 36,37 The assignments for the Ni 2p 3/2 feature in bulk Ni 2 O 3 in the literature vary and are reported at 855.1, 855.8 eV, 856.5 and 857.3 eV. 38 -41 The assignment for the bulk Ni 2p 3/2 feature in -NiOOH in the literature is at 855.3 eV.…”

Section: Resultsmentioning

confidence: 97%