Contribution á l'étude de l'adsorption chimique réversible du soufre sur l'argent

Bénard, J.; Oudar, J.; Cabane-Brouty, F.

doi:10.1016/0039-6028(65)90005-1

Cited by 81 publications

(8 citation statements)

References 6 publications

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“…Figure shows the XP spectra of Ag 3d and S 2p core level regions for complete SiC/Ag/SiO 2 stacks before (0 h) and after accelerated aging in H 2 S for 24, 48, and 96 h. For all samples, the recorded XP C 1s spectra could be fitted with one major component peak set at 285 eV and assigned to −CH 2 –CH 2 – bonded carbon, and one minor component peak at 287.4 ± 0.1 eV assigned to CO and/or O–CO bonded carbon. This is typical of surface organic contamination on oxide thin films exposed to ambient air. ,, Both the XP Si 2p and O 1s spectra (not shown) could be fitted with one single component peak at 103.2 ± 0.1 and 533.1 ± 0.1 eV, respectively, as typical for silicon dioxide. , The O/Si atomic ratio calculated from the intensity ratio of these component peaks was 1.9 ± 0.2, in agreement with the SiO 2 stoichiometry. This ratio was unchanged after sulfidation of the stacks.…”

Section: Resultssupporting

confidence: 59%

“…Accelerated atmospheric aging was performed in gaseous H 2 S selected as most corrosive indoor atmospheric agent for silver. The as-received stacks were installed into a quartz tube mounted into a setup dedicated to thermal treatments under reactive gases. − The tube was first pumped to secondary vacuum in the 10 –5 mbar range, and then filled with H 2 S gas (5N purity, Air Liquide) at pressures from high 10 –5 mbar range to 1000 mbar. The results reported hereafter are for accelerated aging tests performed at 1000 mbar and 75 °C.…”

Section: Experimental Sectionmentioning

confidence: 99%

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Local Degradation Mechanisms by Tarnishing of Protected Silver Mirror Layers Studied by Combined Surface Analysis

et al. 2017

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In this work, we addressed the local degradation mechanisms limiting the prelaunch environmental durability of thin-layered silver stacks for demanding space mirror applications. Local initiation and propagation of tarnishing were studied by combined surface and interface analysis on model stack samples consisting of thin silver layers supported on lightweight SiC substrates and protected by thin SiO overcoats, deposited by cathodic magnetron sputtering and submitted to accelerated aging in gaseous HS. The results show that tarnishing is locally initiated by the formation of AgS columns erupting above the stack surface. AgS growth is promoted at high aspect ratio defects (surface pores) of the SiC substrate as a result of an imperfect protection by the SiO overcoat. Channels most likely connect the silver layer to its environment through the protection layer, which enables local HS entry and AgS growth. The silver sulfide columns grow in number and size eventually leading to coalescence with increasing HS exposure. In more advanced stages, tarnishing slows down owing to saturation of all pre-existing imperfectly protected sites of preferential sulfidation. However, it progresses radially at the basis of the AgS columns underneath the protection layer, consuming the metallic silver layer and deteriorating the protecting overcoat.

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Section: Resultssupporting

confidence: 59%

Section: Experimental Sectionmentioning

confidence: 99%

Local Degradation Mechanisms by Tarnishing of Protected Silver Mirror Layers Studied by Combined Surface Analysis

et al. 2017

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“…Concerning the specific interaction of H 2 S with Ag͑111͒, almost all previous studies have focused on using H 2 S as a source of adsorbed S. In those studies, dissociative adsorption was achieved using high pressure and/or elevated surface temperature when H 2 S was in the gas phase, [1][2][3][4][5][6][7] or using electrochemical methods when H 2 S was in liquid solution. 7,8 In contrast, the present paper deals with the state of the molecule that is obtained by adsorption at low pressure and at temperatures ͑T͒ of 5-30 K.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature adsorption of H2S on Ag(111)

Russell

Liu

Kawai

et al. 2010

The Journal of Chemical Physics

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H 2 S forms a rich variety of structures on Ag(111) at low temperature and submonolayer coverage. The molecules decorate step edges, exist as isolated entities on terraces, and aggregate into clusters and islands, under various conditions. One type of island exhibits a (×)R25.3° unit cell. Typically, molecules in the clusters and islands are separated by about 0.4 nm, the same as the S-S separation in crystalline H 2 S. Density functional theory indicates that hydrogen-bonded clusters contain two types of molecules. One is very similar to an isolated adsorbed H 2 S molecule, with both S-H bonds nearly parallel to the surface. The other has a S-H bond pointed toward the surface. The potential energy surface for adsorption and diffusion is very smooth. KeywordsAmes Laboratory, adsorption, density functional theory, diffusion, hydrogen bonds, intermolecular forces, island structure, molecular clusters, potential energy surfaces, silver, sulphur compounds H 2 S forms a rich variety of structures on Ag͑111͒ at low temperature and submonolayer coverage. The molecules decorate step edges, exist as isolated entities on terraces, and aggregate into clusters and islands, under various conditions. One type of island exhibits a ͑ ͱ 37ϫ ͱ 37͒R25.3°unit cell.Typically, molecules in the clusters and islands are separated by about 0.4 nm, the same as the S-S separation in crystalline H 2 S. Density functional theory indicates that hydrogen-bonded clusters contain two types of molecules. One is very similar to an isolated adsorbed H 2 S molecule, with both S-H bonds nearly parallel to the surface. The other has a S-H bond pointed toward the surface. The potential energy surface for adsorption and diffusion is very smooth.

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“…Besides, orderly arranged disulfide monomolecular coatings could be obtained using a simple and technologically easy treatment of the corresponding metal surfaces in the hydrogen sulfide atmosphere. Comprehensive investigations of interaction between hydrogen sulfide and variously oriented surfaces of metal single crystals have been performed in wide pressure (10 -2 10 Pa) and temperature (100-350 °C) ranges for Cu-S [27], Ni-S [28], Ag-S [29], Fe-S [30] and Au-S [31] systems in the hydrogen sulfide-hydrogen atmosphere. Reversible chemisorption, low-energy electron diffraction and Auger electron spectroscopy have been used in combination with sulfur S 35 isotope.…”

Section: Chemical Modification Of the Metal Surface Of An Optoelectromentioning

confidence: 99%

Biochemical passivation of metal surfaces for sensor application: reactive annealing of polycrystalline gold films in hydrogen sulfide atmosphere

Snopok¹

2000

Semicond. Phys. Quantum Electron. Optoelectron.

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The formation of Au x S y interfacial layer by reactive annealing of gold films in H 2 S atmosphere is investigated. This seems to be a technologically favorable technique for the large-scale and low-cost fabrication of nondestructive immobilization support for biological molecules. Formation of phases with different chemical functionality and surface topography as a function of reaction time was studied using Atomic Force Microscopy (AFM), Surface Plasmon Resonance (SPR) measurements and biomolecular interaction analysis (trypsin-Soybean Trypsin Inhibitor (STI) reaction). The results obtained confirm the classical two-step model for the sulfide phase formation during reactive annealing. This includes an intermediate formation of a dispersed phase of sulfur followed by its reconstruction to a close-packed sulfide layer. Adsorption of proteins onto a certain sulfide layer passes with retention of a native state of adsorbed molecules. The proposed strategy for formation of biochemical structures (gold/sulfide/proteins) on the surface of physical transducers opens a new way for design and development of novel artificial smart sensing systems. They not only maintain optimal functioning of bioreceptors but also are responsive to their environment.

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Contribution á l'étude de l'adsorption chimique réversible du soufre sur l'argent

Cited by 81 publications

References 6 publications

Local Degradation Mechanisms by Tarnishing of Protected Silver Mirror Layers Studied by Combined Surface Analysis

Local Degradation Mechanisms by Tarnishing of Protected Silver Mirror Layers Studied by Combined Surface Analysis

Low-temperature adsorption of H2S on Ag(111)

Biochemical passivation of metal surfaces for sensor application: reactive annealing of polycrystalline gold films in hydrogen sulfide atmosphere

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