Direct recoil spectroscopy of adsorbed atoms and self-assembled monolayers on Cu(001)

Alarcón, L. Salazar; Jia, Juanjuan; Carrera, A.; Esaulov, Vladimir A.; Ascolani, H.; Gayone, J. E.; Sánchez, Esteban; Grizzi, O.

doi:10.1016/j.vacuum.2014.01.017

Cited by 9 publications

(5 citation statements)

References 32 publications

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“…This technique is very sensitive to top surface atoms, produces negligible damage to the organic layer, and has been useful for detecting S atoms on S-terminated dithiol SAMs. 57,62 The Pd crystal was prepared by several cycles of Ar + sputtering and annealing at 600 °C. It was then exposed to BDMT vapors and analyzed by ion scattering.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

“…The TOF-DRS investigation of Pd sulfidation was performed in our own laboratory in Orsay. This technique is very sensitive to top surface atoms, produces negligible damage to the organic layer, and has been useful for detecting S atoms on S-terminated dithiol SAMs. , …”

Section: Experimental Methodsmentioning

confidence: 99%

“…It is also interesting to point out that in some early investigations of methanethiol adsorption on other transition metals (Rh, W and Ni − ) there are also observations of multicomponent S 2p spectra, which by analogy with the Pd case could be due to some type of interface sulfide layers. Similarly, some thiol and dithiol adsorption on Cu also involves initial dissociation and thereafter formation of the molecular layer on the surface with sulfur. Understanding the interfaces in these situations is thus very important.…”

Section: Introductionmentioning

confidence: 99%

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Chalcogen Atom Interaction with Palladium and the Complex Molecule–Metal Interface in Thiol Self Assembly

et al. 2014

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In the case of reactive metals, on adsorption of organic chalcogenide molecules like thiols, chalcogenide-C bond scission can occur. Thus, the high reactivity of Pd leads to initial thiol dissociation and formation of a complex PdS interface layer on which thereafter thiol self-assembled monolayers (SAM) can form. In this context we investigate in detail the adsorption of S, Se, alkanethiols, and aromatic dithiols on Pd by photoemission with synchrotron radiation. The nature of the PdS and PdSe layers formed is studied, and thiol adsorption on Pd(111), PdS, and PdSe surfaces is investigated, along with interface characteristics. After initial strong sulfidation (selenization) in Na2S(Se) solutions, a well-ordered surface PdS (PdSe) layer can be obtained by annealing. For S, annealing leads to formation of a PdS (root 7 x root 7)R19.1 degrees layer, whereas for Se, large domains of this structure are formed. Experiments suggest that in thiol adsorption the Pdsulfide interface is not simply similar to the (root 7 x root 7)R19.1 degrees PdS layer but that modifications in this surface sulfide layer are induced. A similar effect is observed on the selenide interface layer. In addition, 1,4-benzenedimethanethiol adsorption on Pd is investigated with the aim of creation of thiol-terminated dithiol molecular layers. Unlike the case of surfaces like Au, no clear indication of a standing-up, thiol-terminated SAM was found. X-ray radiation damage effects are reported

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Section: ■ Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chalcogen Atom Interaction with Palladium and the Complex Molecule–Metal Interface in Thiol Self Assembly

et al. 2014

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“…Characteristics of 1,4 benzenedimethanethiol (BDMT; HS‐CH 2 ‐(CH) 6 ‐CH 2 ‐SH) and C4DT 33a adsorption on Au(111), and BDMT adsorption on Ag(111), Cu(100), and Cu(111) 33b were investigated by ion scattering 30a and photoemission for progressive evaporation in high vacuum conditions and revealed several noteworthy points. XPS data were analyzed based on the S 2p spectrum characteristics and analysis of Au4f, C1s and S2p signals in terms of electron intensity attenuation due to scattering through the organic layer .…”

Section: Dithiol Self Assembled Monolayersmentioning

confidence: 99%

“…">5.The case of Cu surface illustrates another interesting point. In initial phases of BDMT adsorption spontaneous S‐C bond scission occurred , 33b, leading to appearance of atomic S on the surface. This was observed both in time of flight ion scattering spectra (Fig.…”

Section: Dithiol Self Assembled Monolayersmentioning

confidence: 99%

Selfassembly of α,ω‐dithiols on surfaces and metal dithiol heterostructures

Hamoudi

Esaulov

2016

Annalen der Physik

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α,ω-Dithiols present an interesting case of molecules with two reactive terminal -SH groups (HS-R-SH) that allow their use as binders between different metallic entities. They have thus been used in molecular electronics conduction measurements, in "nanogap" electrodes of interest in plasmonics, as building blocks of more complex structures such as metal intercalated superlattices and in the formation of metalized organic thin films, including doped graphene type films. There exist however many problems, because the molecules may end up in undesirable configurations with both thiol terminals bound to the same metal particle/substrate or link with other molecules to produce "multi-molecule" or "multilayer" structures. This report discusses various key questions on dithiol linking with metal surfaces and the quest of protocols of making problem free dithiol metal structures. It then describes the use of dithiols and their SAMs to produce various metal organic heterostructures useful for molecular electronics and formation of doped metalized organic thin films. We discuss the build up of these structures by self assembly and lithography, their chemical composition and functional properties.

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