Carbon contamination and oxidation of Au surfaces under extreme ultraviolet radiation: An x-ray photoelectron spectroscopy study

Al-Ajlony, Al-Montaser Bellah A.; Kanjilal, A.; Harilal, S. S.; Hassanein, A.

doi:10.1116/1.4737160

Cited by 20 publications

(13 citation statements)

References 33 publications

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“…4(a). This minor oxygen presence in the surface is most likely due to some water adsorption on the target surface occurred after the irradiation process [47]. High resolution XPS of the W-4f region (Fig.…”

Section: Results and Discussion A Effect Of He + Ion Fluencementioning

confidence: 99%

Low energy helium ion irradiation induced nanostructure formation on tungsten surface

Al-Ajlony

Tripathi

Hassanein

2017

Journal of Nuclear Materials

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We report on the low energy helium ion irradiation induced surface morphology changes on tungsten (W) surfaces under extreme conditions. Surface morphology changes on W surfaces were monitored as a function of helium ion energy (140-300 eV), fluence (2.3 × 10 24-1.6 × 10 25 ions m-2), and flux (2.0 × 10 20-5.5 × 10 20 ion m-2 s-1). All the experiments were performed at 900 o C. Our study shows significant effect of all the three ion irradiation parameters (ion flux, fluence, and energy) on the surface morphology. However, the effect of ion flux is more pronounced. Variation of helium ion fluence allows to capture the very early stages of fuzz growth. The observed fuzz growth and morphology changes were understood in the realm of various possible phenomena. The study has relevance and important impact in the current and future nuclear fusion applications.

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Section: Results and Discussion A Effect Of He + Ion Fluencementioning

confidence: 99%

Low energy helium ion irradiation induced nanostructure formation on tungsten surface

Al-Ajlony

Tripathi

Hassanein

2017

Journal of Nuclear Materials

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“…The appearance of the carbon species in the XPS sample obtained with the gold film is consistent with the early literature that the ambient chemicals can rapidly be adsorbed onto the gold surfaces. 48,49 Ag + Adsorption onto the BuT-Functionalized Gold. Direct evidence showing the Ag + binding to the BuTfunctionalized gold are shown with the XPS measurements (Figure 3).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Reactive Ag⁺ Adsorption onto Gold

et al. 2017

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Proposed mechanisms of monolayer silver formation on gold nanoparticle (AuNP) include AuNP-facilitated under-potential reduction and antigalvanic reduction in which the gold reduces Ag+ into metallic atoms Ag(0). Reported herein is the spontaneous reactive Ag+ adsorption onto gold substrates that include both as-obtained and butanethiol-functionalized citrate- and NaBH4-reduced gold nanoparticles (AuNPs), commercial high-purity gold foil, and gold film sputter-coated onto silicon. The silver adsorption invariably leads to proton releasing to the solution. The nominal saturation packing density of silver on AuNPs varies from 2.8 ± 0.3 nmol/cm2 for the AuNPs preaggregated with KNO3 to 4.3 ± 0.2 nmol/cm2 for the AuNPs prefunctionalized with butanethiol (BuT). The apparent Langmuir binding constant of the Ag+ with the preaggregated AuNPs and BuT-functionalized AuNPs are 4.0 × 103 M–1 and 2.1 × 105 M–1, respectively. The silver adsorption has drastic effects on the structure, conformation, and stability of the organothiols on the AuNPs. It converts disordered BuT on AuNPs into highly ordered trans conformers, but induces near complete desorption of sodium 2-mercaptoethanesulfonate and sodium 3-mercapto-1-propyl sulfonate from AuNPs. Mechanically, the Ag+ adsorption on AuNPs most likely proceeds by reacting with molecules preadsorbed on the AuNP surfaces or chemical species in the solutions, and the silver remains as silver ion in these reaction products. This insight and methodology presented in this work are important for studying interfacial interactions of metallic species with gold and for postpreparation modulation of the organothiol structure and conformation on AuNP surfaces.

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“…19 Additionally, the XPS peak indicating adsorbed atomic oxygen, which should appear at lower binding energy, was not observed. 25,26 We also observed that the oxygen network is stable at room temperature.…”

Section: ■ Results and Discussionmentioning

confidence: 59%

Trellises of Molecular Oxygen on Anatase TiO₂(101)

et al. 2019

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The adsorption of molecular oxygen has important implications for the catalytic activity of oxide surfaces, especially for oxidative TiO 2 catalysts. In the case of anatase TiO 2 (101), several studies have noted the importance of surface defects which stabilize the adsorption of oxygen molecules because of charge transfer. Further oxygen adsorption via this mechanism is precluded once a stoichiometric TiO 2 surface is attained. Here, the adsorption of oxygen molecules was reenabled through a simple modification of sample cleaning procedures, resulting in the formation of a well-ordered trellis arrangement of oxygen molecules. The trellis is strongly passivating and does not affect the band gap of the pristine anatase substrate. Furthermore, they induce the extension of anatase terraces up to 100 Å wide. The atomic and electronic structures of the trellis were investigated using scanning tunneling microscopy experimentation and density functional theory calculations.

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Carbon contamination and oxidation of Au surfaces under extreme ultraviolet radiation: An x-ray photoelectron spectroscopy study

Cited by 20 publications

References 33 publications

Low energy helium ion irradiation induced nanostructure formation on tungsten surface

Low energy helium ion irradiation induced nanostructure formation on tungsten surface

Reactive Ag⁺ Adsorption onto Gold

Trellises of Molecular Oxygen on Anatase TiO₂(101)

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Carbon contamination and oxidation of Au surfaces under extreme ultraviolet radiation: An x-ray photoelectron spectroscopy study

Cited by 20 publications

References 33 publications

Low energy helium ion irradiation induced nanostructure formation on tungsten surface

Low energy helium ion irradiation induced nanostructure formation on tungsten surface

Reactive Ag+ Adsorption onto Gold

Trellises of Molecular Oxygen on Anatase TiO2(101)

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Product

Resources

About

Reactive Ag⁺ Adsorption onto Gold

Trellises of Molecular Oxygen on Anatase TiO₂(101)