Angular-resolved XANES measurements of the polar and azimuthal orientation of alkanethiols on InP(110)

Angular Resolved X-Ray Absorption Near Edge Structure Investigation of Adsorbed Alkanethiol Monolayers on Iii–v(110) Surfaces

“…8 This conclusion has been drawn from the complete absence of oxygen-related features in the spectra even after contact with atmosphere and the existence of essentially only one distinct sulfur species in freshly prepared thiol layers, which has been attributed to In-S bonds at the interface. 8,17 Note that from the chemical point of view, based on the experience outlined above as well as from the steric limitations due to the large space requirements of the alkyl chains, which will be discussed below, P-S bonds are much less likely and will not be considered here.…”

“…17 In brief, the observed azimuthal dependence of the C-C(σ * ) intensity was strongly peaked along the two opposite [001] surface directions. The intensity nearly vanished far off these surface directions, in particular along [1][2][3][4][5][6][7][8][9][10].…”

“…Recently, we have demonstrated that adsorbed alkanethiols form self-assembling layers on (110) surfaces of III-V semiconductors like InP, as well. 8,17,18 Using core level photoelectron spectroscopy (XPS) we have shown that these SAMs may passivate the semiconductor surface from oxidation for some weeks, as judged from the XPS sensitivity scale. 8 Here we focus on structural properties of alkanethiols on III-V(110) surfaces, which have been studied via analysis of the X-ray absorption near edge structure (XANES) of the carbon atoms in the alkyl chains (C K edge).…”

Zinc dialkyl dithiophosphate antiwear tribofilm and its effect on the topography evolution of surfaces: A numerical and experimental study

“…The P 2p signal was detected at 133.4 eV while the Zn 3s at 140.0 eV. S 2p signal was found on the surface at 161.8 eV which is attributed to the oxidation state of -2 as found in sulphides (74) and thiolates (75) or when sulphur is substituting oxygen atoms in a phosphate (73). Figure 10 shows the XPS depth profile of the tribofilm formed on the surface of the ring in the boundary lubrication regime.…”

Long‐Range Molecular Organization of an Organic Monolayer Grafted on a Mineral Substrate

“…Angular-resolved X-ray absorption near-edge spectroscopy (XANES) measurements have been used for alkanethiol monolayers on InP(110) and have shown the existence of domains with single molecular orientation extended over dimensions limited by the cleavage steps and defects. [20] Infrared/visible sum frequency generation (SFG) spectroscopy was applied to an octadecyl monolayer on hydrogen-terminated Si(111) surfaces to characterize the conformation and orientation of the chains in the monolayer. [21] The tilt angle was estimated and the data suggested an epitaxial arrangement of the monolayer on the Si(111) substrate.…”