Untitled

Carley, Albert Frederick; Davies, Philip R.; Harikumar, K. R.; Jones, Rhys Vaughan; Kulkarni, G. U.; Roberts, M. W.

doi:10.1023/a:1009015318393

Cited by 36 publications

(61 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We conclude that heating results in the decomposition of the surface adsorbed L-Cys and forms an ordered sulphur adlayer at the Ag(110) surface. This result is similar to the results of Carley et al [22,23] for the system methanethiol (CH 3 SH) on Cu(110), where heating to ∼450 K results in the thermal decomposition of methanethiol, leaving an ordered chemisorbed S adlayer with c(8 × 2) and p(3 × 2) symmetry. A c(8 × 2) S adlayer structure has also been observed by Stensgaard et al [24] following exposure of Cu(110) to H 2 S.…”

Section: The Clean Ag(110) Surface Stm Resultssupporting

confidence: 90%

“…On the Cu(110) surface, S adsorption occurs at the two-fold hollow sites with a compression of the top Cu/S adlayer along the [110] direction that results in surface buckling [22]. The RA response of clean Ag(110) in the region of 3.85 eV and 4.1 eV is thought to involve surface-modified bulk band transitions [11] and these RAS transitions are highly sensitive to the atomic structure of the surface.…”

Section: Discussionmentioning

confidence: 99%

“…The c(8 × 2) structure, as observed in the LEED results, could not be resolved with STM, which may be the result of unfavorable experimental conditions or the mobility of S adatoms -for S concentrations up to about half a monolayer, the S adatoms are mobile and cannot be imaged [23]. Surface restructuring of Cu(110) has been observed upon decomposition of methanethiol by heating [22,23] and upon exposure to H 2 S at room temperature [24]. The latter of these studies observed etching of steps and the formation of islands on terraces [24].…”

Section: Heating the L-cys Saturated Surfacementioning

confidence: 92%

See 2 more Smart Citations

Investigating the adsorption of the amino acid L‐cysteine onto Ag(110)

Martin

Isted

Cole

et al. 2005

phys. stat. sol. (c)

View full text Add to dashboard Cite

The adsorption of the amino acid L-cysteine (L-Cys) onto the Ag(110) surface at room temperature is investigated using reflection anisotropy spectroscopy (RAS). The adsorption of L-Cys at metal surfaces offers a route to the immobilisation of proteins with potential applications in the nanoscale fabrication of biomaterial surfaces. L-Cys binds strongly to Ag(110) by the formation of a thiolate linkage. Heating the L-Cys saturated surface to 580 K results in the decomposition of the adsorbate, leaving a chemisorbed S adlayer with a c(8 × 2) structure.1 Introduction The self-assembly of organic molecules into thin films at material surfaces is a process that offers a flexible route to the nanoscale engineering of chemically functionalised surfaces with applications in molecular electronics, corrosion inhibition, sensors and biomaterials. The surface-sensitive linear optical technique of reflection anisotropy spectroscopy (RAS) [1][2][3], in combination with electron-based probes, has been used to monitor the growth of ultra-high vacuum (UHV) deposited molecular films and RAS has shown sensitivity to molecular orientation and assembly [4][5][6][7]. These previous RAS studies have focused on the Cu(110) substrate to induce ordered anisotropy in the growing film and have exploited molecular adsorbates that interact via the Cu-carboxylate interaction.Another molecule-substrate interaction of technological importance is the metal-thiolate bond. This interaction is exploited in the routine preparation of self assembled monolayers of alkane-thiol molecules at Au surfaces [8,9]. While the Au-thiol interaction has been well studied, relatively little is currently known about the self-assembly and bonding of thiols on other metal surfaces.In the work presented here, we investigate the adsorption of the amino acid L-cysteine (L-Cys) [HS-CH 2 -CH(NH 2 )-COOH] on Ag(110). L-Cys contains a thiol (-SH) group and is known to adsorb onto Au surfaces via a thiolate (Au-S) linkage [10]. The adsorption of L-Cys at metal surfaces offers a route to the immobilisation of proteins with potential applications in the nanoscale fabrication of biomaterial surfaces. We find evidence for L-Cys binding to the Ag(110) surface through an Ag-thiolate linkage. Heating the L-Cys saturated surface results in the decomposition of the adsorbed L-Cys and leaves behind an ordered S adlayer.

show abstract

Section: The Clean Ag(110) Surface Stm Resultssupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Heating the L-cys Saturated Surfacementioning

confidence: 92%

See 1 more Smart Citation

Investigating the adsorption of the amino acid L‐cysteine onto Ag(110)

Martin

Isted

Cole

et al. 2005

phys. stat. sol. (c)

View full text Add to dashboard Cite

show abstract

“…The LEED, STM, SEXAFS, and XPS spectra [50][51][52][53] of various sulfur phases on Cu(110) identified the tendency of the S atom to occupy a hollow site. In reasonable agreement with the experimental observations, our results indicate that the elemental sulfur at 1/9 monolayer coverage is adsorbed preferentially at the HL site showing a substantial adsorption energy of À2.42 eV.…”

Section: Resultsmentioning

confidence: 99%

“…It is thus inferred that (1) H 2 S decomposes facilely to give S* and H 2 on the Cu surfaces by virtue of its advantage of both thermodynamics and kinetics, and (2) the atomic sulfur product makes up a predominant proportion of the surface sulfur-containing species at steady state. In fact, it is clear from Tables 3 and 4 [53,[58][59][60] in which exposure of low-index Cu surfaces to trace amounts of H 2 S can lead to sulfur deposition even at low temperature.…”

Section: Full Papermentioning

confidence: 99%

H₂S splitting on Cu(110): Insight from combined periodic density functional theory calculations and microkinetic simulation

Tang

2013

Int J of Quantum Chemistry

View full text Add to dashboard Cite

Practical copper (Cu)‐based catalysts for the water–gas shift (WGS) reaction was long believed to expose a large proportion of Cu(110) planes. In this work, as an important first step toward addressing sulfur poisoning of these catalysts, the detailed mechanism for the splitting of hydrogen sulfide (H2S) on the open Cu(110) facet has been investigated in the framework of periodic, self‐consistent density functional theory (DFT‐GGA). The microkinetic model based on the first‐principles calculations has also been developed to quantitatively evaluate the two considered decomposition routes for yielding surface atomic sulfur (S*): (1) H2S → H2S* → SH* → S* and (2) 2H2S → 2H2S* → 2SH* → S* + H2S* → S* + H2S. The first pathway proceeding through unimolecular SH* dissociation was identified to be feasible, whereas the second pathway involving bimolecular SH* disproportionation made no contribution to S* formation. The molecular adsorption of H2S is the slowest elementary step of its full decomposition, being related with the large entropy term of the gas‐phase reactant under realistic reaction conditions. A comparison of thermodynamic and kinetic reactivity between the substrate and the close‐packed Cu(111) surface further shows that a loosely packed facet can promote the S* formation from H2S on Cu, thus revealing that the reaction process is structure sensitive. The present DFT and microkinetic modeling results provide a reasonably complete picture for the chemistry of H2S on the Cu(110) surface, which is a necessary basis for the design of new sulfur‐tolerant WGS catalysts. © 2013 Wiley Periodicals, Inc.

show abstract

Electroless Deposition of Gold on a Glassy Carbon Electrode (GCE) Surface for Selective Detection of Hydrogen Peroxide

Imran Hossain,

Dutta,

Ahmed

et al. 2024

ChemistrySelect

View full text Add to dashboard Cite

Electroless deposition technique was employed to coat the surface of a glassy carbon electrode (GCE) with nanoparticles of gold (AuNPs). Afterward, sulfur (S) components were immobilized onto this AuNPs/GC electrode via an in‐situ chemisorption approach that considerably enhanced the catalytic activity, conductivity, and persistent durability of the electrode. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X‐ray photoelectron spectroscopy (XPS) were used to characterize the modified electrode surface. The experimental results indicated that the S−AuNPs/GC electrode exhibits outstanding catalytic activity for the selective detection of H2O2 (HP). SWV measurements showed that the electrochemical sensor has a wide linear range of 10 to 2500 μM and a heightened sensitivity of 50.08 μA mM−1 cm−2. The proposed HP sensor demonstrated adequate repeatability and durability, as well as interference‐free quantitative analysis capability.

show abstract

Untitled

Cited by 36 publications

References 20 publications

Investigating the adsorption of the amino acid L‐cysteine onto Ag(110)

Investigating the adsorption of the amino acid L‐cysteine onto Ag(110)

H₂S splitting on Cu(110): Insight from combined periodic density functional theory calculations and microkinetic simulation

Electroless Deposition of Gold on a Glassy Carbon Electrode (GCE) Surface for Selective Detection of Hydrogen Peroxide

Contact Info

Product

Resources

About

Untitled

Cited by 36 publications

References 20 publications

Investigating the adsorption of the amino acid L‐cysteine onto Ag(110)

Investigating the adsorption of the amino acid L‐cysteine onto Ag(110)

H2S splitting on Cu(110): Insight from combined periodic density functional theory calculations and microkinetic simulation

Electroless Deposition of Gold on a Glassy Carbon Electrode (GCE) Surface for Selective Detection of Hydrogen Peroxide

Contact Info

Product

Resources

About

H₂S splitting on Cu(110): Insight from combined periodic density functional theory calculations and microkinetic simulation