The influence of defects on the Ni 2p and O 1s XPS of NiO

Abstract

AbslracL The Ni 2p and 0 Is XPS of NiO single crystals were measured using monochromatic Al K a radiation. Different treatmenu of the crystals allow us to give a description of the influence of defects on these spectra. The Ni 2p3p spectrum of in-sirucleaved NiO exibiu clearly visible features at 854.1 eV, 855.6 eV and 861 eV The intensity ratio changes after ion bombardment and an additional peak at 852.2 eV appears. ApaR from a slight increase in linewidth the 0 1s spectrum remains unchanged. The 0 Is spectrum from an in-sirueleaved NiO single crystal exhibits only a single peak at 529.4 eV which can be fitted by a Gaussian line profile. Further measurements allow us to attribute the well known 0 Is satellite at 531.2 eV to emission [ram oxygen-containing species adsorbed at defects.

Electronic and magnetic structure of epitaxialFe3O4(001)/NiOheterostructures grown on MgO(001) and Nb-doped<

“…At higher excitation energies the spectra are identical to that of Fe 3 O 4 , despite in particular for sample SN1 a weak Fe 3+ charge transfer satellite is also present at higher excitation energies indicating a small excess of trivalent ions at the interface between Fe 3 O 4 and NiO. 44 The corresponding Ni 2p spectra are overlapped by broad Fe 2s states (Figs. 2b and d).…”

The Impact of Different Si Surface Terminations in the (001) n-Si/NiOx Heterojunction on the Oxygen Evolution Reaction (OER) by XPS and Electrochemical Methods

“…Uhlenbrockt et al 26 investigated a pure NiO single crystal cleaved under UHV conditions and found that a perfect NiO surface exhibits the characteristic peak at 853.4 to 854.4 eV but also an additional shoulder at 855.6 eV which overlaps with the characteristic peak for Ni 2 O 3 and Ni(OH) 2 at 855.1 to 856.6 eV, 27-32 see gray areas in Figure 2. Therefore the Ni 2p spectra was fitted according to 33 with hydrogen terminated Figure 1.…”

Gold nanoparticles on metal oxide surfaces derived from n-alkanethiolate-stabilized gold nanoparticles; investigations of the adsorption mechanism and sulfate formation during subsequent thermolysis

“…Both the unthermolyzed and thermolyzed solids show peaks at about 529.5 and 531.5 eV. The low energy peak is assigned to surface lattice oxygen, and the higher energy peak to adsorbed oxygen and surface hydroxyl species at defect sites [53][54][55]. Any oxygen associated with Ni 3+ (NiO is non-stoichiometric) will also occur at about 531.5 eV [55].…”