Low Energy Ion Scattering and Recoiling Spectroscopy in Surface Science

Esaulov, Vladimir A.

doi:10.1007/978-3-642-34243-1_15

Cited by 12 publications

(6 citation statements)

References 143 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…BDMT evaporative adsorption was studied on Au(111), Cu(100) and Cu(111) surfaces by Alarcón et al [ 25 , 79 ] using time-of-flight ion scattering [ 80 ], which allows the study of the surface composition without inducing noticeable damage. It was observed that in the case of the copper surfaces, at the onset of adsorption, a substantial amount of sulfur on the surface appeared, while the carbon concentration remained small and increased only after addition of a much larger amount of BDMT.…”

Section: Resultsmentioning

confidence: 99%

Case studies on the formation of chalcogenide self-assembled monolayers on surfaces and dissociative processes

Tong¹,

Jiang²,

Bendounan³

et al. 2016

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

SummaryThis report examines the assembly of chalcogenide organic molecules on various surfaces, focusing on cases when chemisorption is accompanied by carbon–chalcogen atom-bond scission. In the case of alkane and benzyl chalcogenides, this induces formation of a chalcogenized interface layer. This process can occur during the initial stages of adsorption and then, after passivation of the surface, molecular adsorption can proceed. The characteristics of the chalcogenized interface layer can be significantly different from the metal layer and can affect various properties such as electron conduction. For chalcogenophenes, the carbon–chalcogen atom-bond breaking can lead to opening of the ring and adsorption of an alkene chalcogenide. Such a disruption of the π-electron system affects charge transport along the chains. Awareness about these effects is of importance from the point of view of molecular electronics. We discuss some recent studies based on X-ray photoelectron spectroscopy that shed light on these aspects for a series of such organic molecules.

show abstract

Section: Resultsmentioning

confidence: 99%

Case studies on the formation of chalcogenide self-assembled monolayers on surfaces and dissociative processes

Tong¹,

Jiang²,

Bendounan³

et al. 2016

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…Interaction of thiols with more reactive substrates such as Ag and Cu has been investigated by several groups. − In a number of cases, well-ordered SAMs were found to be formed. For dithiols, it has been suggested that this may be less obvious, but for BDMT, time-of-flight direct recoil spectroscopy (TOF DRS) ion scattering measurements also indicate formation of a standing up SAM. , These measurements revealed some differences with respect to Au, and in particular for Cu, BDMT uptake was much faster; i.e., lower exposures were necessary. For the Cu(100) surface, a curious observation was the appearance of sulfur at very low exposures, which was attributed to either segregation from the bulk or initial S–C bond scission.…”

Section: Introductionmentioning

confidence: 99%

1,4-Benzenedimethanethiol Interaction with Au(110), Ag(111), Cu(100), and Cu(111) Surfaces: Self-Assembly and Dissociation Processes

et al. 2014

Self Cite

View full text Add to dashboard Cite

In this work, we study systematically the evaporative adsorption under high vacuum conditions of 1,4-benzenedimethanethiol (BDMT) onto different metal surfaces: Ag(111), Au(110), Cu(100), and Cu(111). The study is carried out by photoemission using synchrotron radiation. In the case of Ag(111) and Au(110), at low exposures, a lying down BDMT phase is formed, with both S atoms attached to Ag and Au. A standing up phase is attained after a large exposure, above several hundred thousand Langmuir. However, also a mixed complex over layer appears to be formed, attributable to molecules sticking on top of the SAM. In the case of Au(110), heating leads to BDMT desorption with some degree of SC bond scission, and some S atoms are left in different adsorption sites with mainly two different core level binding energies. On Ag(111), after heating the sample, BDMT desorbs and also sulfidation of Ag occurs. In the case of Cu(100) and Cu(111), SC bond cleavage occurs already after initial adsorption. Lost S from BDMT molecules is adsorbed on Cu. Surface passivation occurs and only then BDMT adsorption takes place, with an interface with Cu enriched with sulfur

show abstract

“…Note that there is also some energy lost to inelastic processes, but the amount is small compared to the elastic energy loss. 38 The bottom spectrum in Fig. 2 was collected following exposure of clean SiO2 to Br2.…”

Section: Resultsmentioning

confidence: 99%

“…Note that there is also some energy lost to inelastic processes, but the amount is small compared to the elastic energy loss. 38 The bottom spectrum in Figure 2 was collected following exposure of clean SiO 2 to Br 2 . The absence of Si and O SSPs is expected because their masses are too small to produce singly scattered 23 Na at a 150°angle with a large enough energy to be detected.…”

Section: Resultsmentioning

confidence: 99%

“…Single scattering occurs when a projectile undergoes a hard binary collision with a surface target atom and scatters directly into the detector, and is the primary means for determining surface composition via LEIS. , The energy of the scattered projectile can be calculated classically considering only conservation of energy and momentum in an elastic collision with an unbound target atom, which predicts that Na will scatter from the heavier Au atoms with a higher energy than when scattered from Br. Note that there is also some energy lost to inelastic processes, but the amount is small compared to the elastic energy loss …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption of Br₂ onto Small Au Nanoclusters

2018

View full text Add to dashboard Cite

Au nanoclusters grown on SiO2 by physical vapor deposition are exposed to Br2 and then measured with 1.5 keV Na + low energy ion scattering. It is found that the clusters are able to dissociate the molecules which then adsorb as individual Br atoms, but Br2 does not stick to the bare substrate nor to bulk Au. Adsorption is the first step in any surface chemical reaction, and this result shows how nanoclusters can induce adsorption of species that otherwise do not stick. Results from the literature indicate that catalysis involving nanoclusters occurs at the edges and that the edge atoms are positively charged. This information in conjunction with the ion scattering results lead to the conclusion that the Br adatoms are negatively charged and ionically bonded at the edges of the clusters. Br2 is also a known catalytic poison and this work shows how its adsorption blocks sites that would otherwise be involved in nanocatalysis.

show abstract

Low Energy Ion Scattering and Recoiling Spectroscopy in Surface Science

Cited by 12 publications

References 143 publications

Case studies on the formation of chalcogenide self-assembled monolayers on surfaces and dissociative processes

Case studies on the formation of chalcogenide self-assembled monolayers on surfaces and dissociative processes

1,4-Benzenedimethanethiol Interaction with Au(110), Ag(111), Cu(100), and Cu(111) Surfaces: Self-Assembly and Dissociation Processes

Adsorption of Br₂ onto Small Au Nanoclusters

Contact Info

Product

Resources

About

Low Energy Ion Scattering and Recoiling Spectroscopy in Surface Science

Cited by 12 publications

References 143 publications

Case studies on the formation of chalcogenide self-assembled monolayers on surfaces and dissociative processes

Case studies on the formation of chalcogenide self-assembled monolayers on surfaces and dissociative processes

1,4-Benzenedimethanethiol Interaction with Au(110), Ag(111), Cu(100), and Cu(111) Surfaces: Self-Assembly and Dissociation Processes

Adsorption of Br2 onto Small Au Nanoclusters

Contact Info

Product

Resources

About

Adsorption of Br₂ onto Small Au Nanoclusters