Electrochemical and structure studies of ethanethiol self-assembled monolayers on Ag single crystal electrodes

Schweizer, Markus; Kolb, Dieter M.

doi:10.1016/j.jelechem.2003.10.037

Cited by 13 publications

(5 citation statements)

References 44 publications

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“…By contrast, an in situ STM investigation of the ethylthiolate layer at an electrochemical interface under an applied potential finds rather clear evidence for a commensurate ( 7× 7) phase. 20 Interestingly, all of these studies show the same domain orientations relative to the substrate as are found for a commensurate ( 7× 7)R19°phase.…”

Section: Introductionsupporting

confidence: 57%

Structure of the Pentylthiolate Self-Assembled Monolayer on Ag(111)

Wang¹,

Woodruff²,

Satterley³

et al. 2007

J. Phys. Chem. C

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A combination of scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and normal incidence X-ray standing waves (NIXSW) has been used to investigate the structure of the self-assembled monolayer (SAM) formed by pentylthiolate on Ag(111) in ultrahigh vacuum through interaction with pentanethiol. NIXSW data are closely similar to those for methythiolate on Ag(111) in the commensurate ( 7× 7)R19°phase and consistent with a similar adsorbate-induced reconstruction of the outermost Ag layer comprising only 3/7 ML of Ag atoms. However, both STM and LEED show that the local lateral periodicity is ∼5% larger in the pentylthiolate phase and that the resulting SAM is not commensurate with the substrate. The results are discussed in the context of previously published results for other alkylthiolate SAMs on Ag(111).

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Section: Introductionsupporting

confidence: 57%

Structure of the Pentylthiolate Self-Assembled Monolayer on Ag(111)

Wang¹,

Woodruff²,

Satterley³

et al. 2007

J. Phys. Chem. C

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“…In literature, besides the electrochemical measurements made by White group, there are few works concerning STM measurements on Ag(100) and on Ag(110) surfaces. It is worthwhile mentioning the measurements conducted in Kolb laboratories that succeed in determining the structure of sulphate and ethanethiol on Ag(111) and Ag(100) 8,9 An incommensurate (1.3x3) superstructure of sulfate or bisulfate was observed on Ag(100), whereas an unusual c(3x3√3) superstructure with four ions per unit cell was found on Ag(111), unlike other (111) metal surfaces studied. No ordered aldlayer has been found on Ag(110).…”

Section: Introductionmentioning

confidence: 92%

In-situ Monitoring of Electrochemical Oxidative Adsorption of Sulfur on Silver Single Crystals by Scanning Tunneling Microscopy

et al. 2010

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Underpotential deposition of sulfur was studied on Ag(100) and Ag(110) from Na2S solution in 0.1M NaOH using in-situ STM. The cyclic voltammogram on Ag(100) presents two broad peaks, whereas three partial overlapping peaks and a more acute one are present for Ag(110). The STM investigation on Ag(100) proves the presence of a first square lattice adsorbed layer after the first peak that undergoes a phase transition towards a more compact structure constituted by couples of atoms after the second peak. On the other hand the process on Ag(110) starts with cluster deposition at the step edges and continues with aggregations of atoms in lines starting from the steps. Only after the acute peak a compact structure can be observed, of which a structure in register with the substrate is hypothesized.

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“…Apart from the electrochemical measurements reported by White and co-workers, , there are few papers concerning STM measurements on Ag(100) and on Ag(110) surfaces. It is worthwhile to mention the structures of sulfate and ethanethiol on Ag(111) and Ag(100). , An incommensurate (1.3 × 3) superstructure of sulfate or bisulfate was observed on Ag(100), whereas, unlike other (111) metal surfaces studied, an unusual c(3×3√3) superstructure with four ions per unit cell was found on Ag(111) and nonordered adlayers were found on Ag(110). Ethanethiol self-assembled monolayers form ordered structures: a square arrangement of an incommensurate structure with a nearest neighbor distance of 0.44 nm was found on Ag(100), whereas a (√7×√7)R19.1° structure with two different adsorption sites and with three molecules per cell was found on Ag(111).…”

Section: Introductionmentioning

confidence: 93%

In Situ Scanning Tunneling Microscopy Investigation of Sulfur Oxidative Underpotential Deposition on Ag(100) and Ag(110)

et al. 2010

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Underpotential (UPD) deposition of sulfur from Na(2)S solution in 0.1 M NaOH was studied on Ag(100) and Ag(110) using in situ scanning tunneling microscopy (STM). The cyclic voltammogram on Ag(100) presents two broad peaks, whereas three partial overlapping peaks and a sharper one are observed on Ag(110). STM measurements carried out during the whole UPD process show that progressively more compact structures are formed as the applied potential is scanned toward more positive potentials. More precisely, p(2×2), c(2×6), and c(2×2) were found on Ag(100) at E = -1.25, -1.0, and -0.9 V, respectively. Less definite conclusions can be drawn for the structures of S overlayers on Ag(110). However, the experimental findings are consistent with an incomplete p(2×1) at potentials preceding the sharp peak, and with a c(2×2) structure at E = -0.9 V vs Ag/AgCl, KCl(sat). The coverage values calculated on the basis of the hypothesized structures have been compared with the values obtained from chronocoulometric measurements at the most positive potentials investigated. Thus, the experimental coverage θ = 0.5 coincides with the coverage calculated for the c(2×2) structure found on Ag(110) at E = -0.9 V by STM, whereas the experimental coverage θ = 0.42 suggests that a mixture of structures c(2×6) and c(2×2) is formed on Ag(100).

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Electrochemical and structure studies of ethanethiol self-assembled monolayers on Ag single crystal electrodes

Cited by 13 publications

References 44 publications

Structure of the Pentylthiolate Self-Assembled Monolayer on Ag(111)

Structure of the Pentylthiolate Self-Assembled Monolayer on Ag(111)

In-situ Monitoring of Electrochemical Oxidative Adsorption of Sulfur on Silver Single Crystals by Scanning Tunneling Microscopy

In Situ Scanning Tunneling Microscopy Investigation of Sulfur Oxidative Underpotential Deposition on Ag(100) and Ag(110)

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