Structural studies of adsorbed alkanethiols on Cu(111) by use of S and C K-edge X-ray absorption fine structures

Imanishi, Akihito; Isawa, K.; Matsui, Fumihiko; Tsuduki, T.; Yokoyama, Toshihiko; Kondoh, Hiroshi; Kitajima, Yoshinori; Ohta, Toshiaki

doi:10.1016/s0039-6028(98)00217-9

Cited by 60 publications

(52 citation statements)

References 26 publications

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“…The second peak at 2473.7 eV in C4 ad spectra becomes more visible at grazing incidence condition and is assigned to S 1s to σ * (S-C) transition. In comparison, for physisorbed 1-butanethiol, there exists an intense peak at 2472.6 eV, which is attributed to the transition from S 1s to both σ * (S-C) and σ * (S-H) transitions (Rieley et al, 1997;Imanishi et al, 1998). The spectra for physisorbed butanethiol are shown in Fig.…”

Section: Figurementioning

confidence: 97%

“…2. For the chemisorbed butanethiol, the shift of the peak toward higher photon energy indicates that S-H bond scission occurs and the thiolate is formed (Imanishi et al, 1998). The broad resonance at ~2484 eV, insensitive to the x-ray incidence angle, is attributed to the substrate scattering effect (Rieley et al, 1997).…”

Section: Figurementioning

confidence: 99%

“…Ultrathin organic thin films of self-assembled monolayers have been the subject of intense research due to their potential applications in areas of lubrication, corrosion inhibitors, gas sensors (Ulman, 1991). In contrast with the extensively studied system of alkanethiols adsorbed on Au surfaces, there have been only a few reports of alkanethiols adsorption on Cu surfaces (Laibinis et al, 1991;Rieley et al, 1997;Hutt et al, 1998;Imanishi et al, 1998;Loepp et al, 1999;Floriano et al, 2000), presumably due to the difficulty of maintaining a clean Cu surface in the solution phase. In anticipation of the wider adoption of Cu-based interconnecting technology in the future generation of IC circuitry, an enhanced understanding of Culiquid interface and the corrosion protection of Cu metal becomes much more necessary.…”

Section: Introductionmentioning

confidence: 99%

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NEXAFS study of 1-butanethiol adsorbed on Cu(111) and \sqrt 7 × \sqrt 7 R19.1° S/Cu(111)

Yang¹,

Venkatesh²,

Fan³

et al. 2001

J Synchrotron Radiat

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The adsorption of 1-butanethiol on Cu(111) and square root of 7 x square root of 7 R19.1 degrees S/Cu(111) surfaces has been studied by S K-edge near edge X-ray absorption fine structure (NEXAFS) spectroscopy and thermal desorption spectroscopy. Upon adsorption on clean Cu(111) surface at room temperature, butanethiolate as well as atomic sulfur is formed. For the butanethiolate, the S-C bond is found predominately perpendicular to the surface as revealed by polarization analysis. In contrast, on square root of 7 x square root of 7 R19.1 degrees S/Cu(111) surface, the S-H and S-C bonds of the butanethiol stay intact, resulting in a weakly chemisorbed butanethiol.

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Section: Figurementioning

confidence: 97%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NEXAFS study of 1-butanethiol adsorbed on Cu(111) and \sqrt 7 × \sqrt 7 R19.1° S/Cu(111)

Yang¹,

Venkatesh²,

Fan³

et al. 2001

J Synchrotron Radiat

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“…For this method, thiol groups are used as an anchor to immobilize organic molecules on noble metal surfaces [1,2], because sulfur atoms form strong chemical bond with noble metals. Some studies have been reported for the formation of organic SAMs on metal sur-faces such as gold [3,4], silver [5] and copper [6,7].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Alkyl Chain Molecules on Oxide Surface Using Phosphonic Acid as an Anchor

Narita

Baba

Sekiguchi

et al. 2012

e-J. Surf. Sci. Nanotechnol.

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For the purpose of formation of stable and uniform organic films on oxide surface, the alkyl chain molecules were immobilized on oxide surfaces using phosphoric acid as an anchor. The molecule investigated was decylphosphonic acid (DPA), which is composed of C10-alkane chain and one of the ends is terminated by phosphonic acid (PO3H2). DPA films are formed on sapphire surfaces by solution methods; immersing the substrate in DPA ethanol solution. The chemical-states of the interface between DPA molecules and the sapphire were investigated by X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) using synchrotron soft X-rays. As to the P K-edge NEXAFS spectra of the DPA film on the sapphire C-plane, the resonance energy of the main peak was the same as that of the molecular DPA. This result indicates that the DPA molecules keep the molecular state. XPS spectra measured under total reflection condition shows that the phosphonic acid group in DPA molecules is located at the lower side, while the alkyl chain is oriented at the upper side on the surface. In order to confirm the thermal stability of the DPA film, the film was heated at 250• C. The peak intensity of the P K-edge NEXAFS spectra decreased, while the intensities of P 1s and C 1s in XPS spectra increased by heating. This discrepancy was explained by the difference of the detection depths between NEXAFS and XPS. Based on the simulation using a simple model, it was found that the DPA molecules form island structures at room temperature, while they become the uniform film after heating. As a result, it was concluded that the uniform and thermally stable films of alkyl chain molecules was formed on the sapphire surface, and phosphonic acid is an excellent anchor that combines alkyl molecules on oxide surface.

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“…Our previous studies 8 -10 show that orientation of the intermolecular S-C bond on metal surfaces varies for the functional groups -CH 3 and -C 2 H 5 . Surface extended x-ray adsorption fine structure (EXAFS) data at the S K-edge of adsorbed alkanethiols on Ag(111) 11 and Cu(111) 12 have been reported where sulfur-metal bond distances were calculated. The orientation of alkane chains on the surface depends on the nature of the sulfurmetal interface.…”

Section: Introductionmentioning

confidence: 99%

Adsorption behaviour of C₂H₅SCH₃ on Ag(111) and Ag(UFP) surfaces

Sardar

Syed

Yagi

et al. 2003

Surface & Interface Analysis

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The adsorption behaviour of ethylmethylsulfide .C 2 H 5 SCH 3 / on Ag(111) and ultrafine particle Ag, Ag(UFP), surfaces has been studied by near-edge x-ray absorption fine structure and x-ray photoelectron spectroscopy techniques. It is found that C 2 H 5 SCH 3 adsorbs molecularly on the Ag(111) surface but dissociates on Ag(UFP). On the Ag(111) surface the molecule shows polarization dependence. The S-C 2 H 5 and S-CH 3 bonds are found to be tilted at angles of 31 ± 5• and 21 ± 5• from the surface, respectively.

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Structural studies of adsorbed alkanethiols on Cu(111) by use of S and C K-edge X-ray absorption fine structures

Cited by 60 publications

References 26 publications

NEXAFS study of 1-butanethiol adsorbed on Cu(111) and \sqrt 7 × \sqrt 7 R19.1° S/Cu(111)

NEXAFS study of 1-butanethiol adsorbed on Cu(111) and \sqrt 7 × \sqrt 7 R19.1° S/Cu(111)

Immobilization of Alkyl Chain Molecules on Oxide Surface Using Phosphonic Acid as an Anchor

Adsorption behaviour of C₂H₅SCH₃ on Ag(111) and Ag(UFP) surfaces

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Structural studies of adsorbed alkanethiols on Cu(111) by use of S and C K-edge X-ray absorption fine structures

Cited by 60 publications

References 26 publications

NEXAFS study of 1-butanethiol adsorbed on Cu(111) and \sqrt 7 × \sqrt 7 R19.1° S/Cu(111)

NEXAFS study of 1-butanethiol adsorbed on Cu(111) and \sqrt 7 × \sqrt 7 R19.1° S/Cu(111)

Immobilization of Alkyl Chain Molecules on Oxide Surface Using Phosphonic Acid as an Anchor

Adsorption behaviour of C2H5SCH3 on Ag(111) and Ag(UFP) surfaces

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Adsorption behaviour of C₂H₅SCH₃ on Ag(111) and Ag(UFP) surfaces