Surface chemistry of rare-earth oxide surfaces at ambient conditions: reactions with water and hydrocarbons

Külah, Elçin; Marot, L.; Steiner, Roland; Romanyuk, Andriy; Jung, Thomas A.; Wäckerlin, Aneliia; Meyer, Ernst

doi:10.1038/srep43369

Cited by 73 publications

(31 citation statements)

References 59 publications

(99 reference statements)

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“…1(c). Since the content of C in the surface decreases, the increase of adsorbed hydrocarbons is ruled out as the possible cause for the light-induced enhancement of the hydrophobicity [45][46][47]. Nevertheless, a decrease in carbon content can result in an increase of the intensity of the XPS contributions located at higher energies [48].…”

Section: A Hydrophobicity Control Through Light Illuminationmentioning

confidence: 99%

Light-induced breathing in photochromic yttrium oxyhydrides

Baba

Montero

Strugovshchikov

et al. 2020

Phys. Rev. Materials

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When exposed to air, metallic yttrium dihydride YH 2 films turn into insulating and transparent yttrium oxyhydride (YHO). The incorporation of oxygen causes the lattice expansion of YH 2 and the emergence of photochromic properties, i.e., YHO darkens reversibly when illuminated with light of adequate energy and intensity. However, the adequate bleaching of the photodarkened samples once the illumination has stopped is much faster in air than in inert atmosphere. According to this experimental evidence, the photochromic mechanism has to be related to an oxygen diffusion and exchange process. Since this process is accompanied by a lattice expansion/contraction, it can be said that YHO "breathes" when subjected to illumination/darkness cycling. Another interesting side effect of the breathing is the unexpected enhancement of the hydrophobicity of the YHO samples under illumination. A theoretical model able to explain the breathing in YHO is presented, together with the discussion of other alternative explanations.

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Section: A Hydrophobicity Control Through Light Illuminationmentioning

confidence: 99%

Light-induced breathing in photochromic yttrium oxyhydrides

Baba

Montero

Strugovshchikov

et al. 2020

Phys. Rev. Materials

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“…Finally, taking into account our XPS O 1s data, SEM and the results after Külah et al [39], we make assumptions about at least the two types of oxygen defects in Gd 2 O 3 -deficient and excess. This established oxygen heterogeneity is considered without accounting for the OHgroup technological signatures.…”

Section: Xps Core-level Spectroscopymentioning

confidence: 99%

Electronic structure, charge transfer, and intrinsic luminescence of gadolinium oxide nanoparticles: Experiment and theory

Zatsepin

Boukhvalov

Kuznetsova

et al. 2018

Applied Surface Science

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The cubic (c) and monoclinic (m) polymorphs of Gd 2 O 3 were studied using the combined analysis of several materials science techniques -X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) spectroscopy. Density functional theory (DFT) based calculations for the samples under study were performed as well. The cubic phase of gadolinium oxide (c-Gd 2 O 3 ) synthesized using a precipitation method exhibits spheroidal-like nanoclusters with well-defined edges assembled from primary nanoparticles with an average size of 50 nm, whereas the monoclinic phase of gadolinium oxide (m-Gd 2 O 3 ) deposited using explosive pyrolysis has a denser structure compared with natural gadolinia. This phase also has a structure composed of three-dimensional complex agglomerates without clear-edged boundaries that are ~21 nm in size plus a cubic phase admixture of only 2 at. % composed of primary edge-boundary nanoparticles ~15 nm in size. These atomic features appear in the electronic structure as different defects ([Gd…O-OH] and [Gd…O-O]) and have dissimilar contributions to the charge-transfer processes among the appropriate electronic states with ambiguous contributions in the Gd 5р -O 2s core-like levels in the valence band structures. The origin of [Gd…O-OH] defects found by XPS was wellsupported by PL analysis. The electronic and atomic structures of the synthesized gadolinias calculated using DFT were compared and discussed on the basis of the well-known joint OKTvan der Laan model, and good agreement was established.

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“…The number of surface metal ions depends on the metal ion valency and the lattice planes exposed. So, the surface hydroxyl group density for lanthanide metal oxide is varied and affects enrichment efficiency [34]. GO is preferred over graphene as intrinsic oxygen is needed to coordinate with lanthanides.…”

Section: Resultsmentioning

confidence: 99%

Graphene oxide–metal oxide nanocomposites for on‐target enrichment and analysis of phosphorylated biomolecules

Jabeen

Sajid

Fatima

et al. 2021

J of Separation Science

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The surface of matrix‐assisted laser desorption/ionization mass spectrometry target is modified for improved signal strength and detection of analytes. The developed method includes on‐target enrichment and detection of phosphopeptides/phospholipids using graphene oxide–lanthanide metal oxides (samarium, gadolinium, dysprosium, and erbium) nanocomposites. Enriched phosphopeptides are detected using material enhanced laser desorption/ionization mass spectrometry and phospholipids by laser desorption/ionization‐mass spectrometry. Nanocomposites are prepared using graphene oxide with respective metal salts at high pH. They are characterized for nano‐morphology, chemistry, porosity, composition, crystallinity, and thermal stability. Phosphopeptides enrichment protocol is developed and optimized for tryptic β‐casein digest and that of phospholipids by phosphatidylcholine standard. Statistical analyses of phosphopeptides and phospholipids from milk show overlapping results for gadolinium, dysprosium, and erbium oxide nanocomposites. GO‐Gd2O3 has better enrichment efficiency and application as LDI material. Selectivity for GO‐Dy2O3 is 1:2500, for GO‐Sm2O3 is 1:3500, and 1:4000 for GO‐Gd2O3. GO‐Er2O3 has a sensitivity of 25 fmol, whereas the highest sensitivity is down to 0.5 fmol for GO‐Gd2O3. On‐target enrichment is batch to batch reproducible with a standard deviation of <1, reduced time of enrichment to 10 min, and ease of operation compared to solid‐phase batch extraction. The developed method enriches serum phosphopeptides characteristic of cancer‐related phosphoproteins.

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Surface chemistry of rare-earth oxide surfaces at ambient conditions: reactions with water and hydrocarbons

Cited by 73 publications

References 59 publications

Light-induced breathing in photochromic yttrium oxyhydrides

Light-induced breathing in photochromic yttrium oxyhydrides

Electronic structure, charge transfer, and intrinsic luminescence of gadolinium oxide nanoparticles: Experiment and theory

Graphene oxide–metal oxide nanocomposites for on‐target enrichment and analysis of phosphorylated biomolecules

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