Surface enhanced infrared spectroscopy—Au(1 1 1-20nm)/sulphuric acid—new aspects and challenges

Wandlowski, Th.; Ataka, Kenichi; Pronkin, Sergey; Diesing, Detlef

doi:10.1016/j.electacta.2003.06.002

Cited by 158 publications

(279 citation statements)

References 67 publications

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“…Surface-enhanced infrared absorption spectroscopy (SEIRAS) with attenuated-total reflection (ATR) configuration is also an attractive analytical tool for probing electrochemical interfaces because of its high signal sensitivity and a simple surface selection rule [21][22][23]. A key issue for successfully implementing this technique is to fabricate appropriate nanoparticle metal films that can produce strong SEIRA effect while maintain essentially the same electrochemical properties as their bulk counterparts.…”

Section: Introductionmentioning

confidence: 99%

Seeded growth fabrication of Cu-on-Si electrodes for in situ ATR-SEIRAS applications

Wang

Yan

Huo

et al. 2007

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Seeded growth fabrication of Cu-on-Si electrodes for in situ ATR-SEIRAS applications

Wang

Yan

Huo

et al. 2007

Electrochimica Acta

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“…58,59 The spikes observed at 1.03 V versus RHE are associated with an ordered-disordered phase transition of the sulfate adlayer. 60,61 Of the techniques shown above, only in situ STM showed reconstructed rows on terraces at lower potentials than the potential of zero charge; a phase transition of the topmost atomic layer, due to the adsorption of sulfate ions; and an ordered (√3 © √7) structure of sulfate on Au(111), obtained by changing the electrode potential.…”

Section: Sulfate/bisulfate Adlayersmentioning

confidence: 99%

Recent Progresses of Electrochemical Surface Science &sim;Importance of Surface Imaging with Atomic Scale&sim;

Itaya

2015

Electrochemistry

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In the electrochemical surface science during the past 20 years, in-situ electrochemical scanning tunneling microscopy (EC-STM) and atomic force microscopy (AFM) have made significant contribution to understand various electrochemical processes with atomic scale. For examples, the underpotential deposition of copper, silver, and other metal ions; the specific adsorption of anions such as iodine and sulfate/bisulfate ions; electrochemical etching processes of metals and semiconductors and the molecular assembly of many organic molecules, such as metalloporphyrins, and metallophthalocyanines. Furthermore, we have recently developed a high resolution laser confocal microscope, combined with a differential interference contrast microscope, which enables to follows fast dynamic electrochemical processes at atomic height resolution in relatively large areas. It has been shown for the first time that single atomic steps of metals can be successfully seen by the newly developed optical microscope. Surface imaging techniques provide local pictures of electrode processes on the atomic scale, not averaged information in large areas.

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“…Finally, the presence in the spectra collected in D 2 O solutions of a band at 1380 cm -1 characteristic of deuterated TU, at potentials as high as 0.90 V indicates the presence of significant amounts of coadsorbed TU coexisting with thioureate at this potential. concentrations for which solution or surface dissolution processes are not significant) as well as the study of interactions between adsorbed species and interfacial water molecules [38,39]. In order to better support the assignment of experimental vibrational frequencies, DFT calculations will be used for obtaining optimized adsorbate geometries and theoretical harmonic vibrational frequencies of adsorbed FDS, TU and thioureate species.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

On the electrochemical behavior of formamidine disulfide on gold electrodes in acid media

Cheuquepán

Orts

Rodes

2016

Journal of Electroanalytical Chemistry

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Please cite this article as: William Cheuquepán, José Manuel Orts, Antonio Rodes, On the electrochemical behavior of formamidine disulfide on gold electrodes in acid media, Journal of Electroanalytical Chemistry (2016Chemistry ( ), doi: 10.1016Chemistry ( /j.jelechem.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT ABSTRACTThe adsorption and reactivity of formamidine disulfide (FDS) was studied at gold single crystal and thin film electrodes in perchloric acid solutions and the results of cyclic voltammetry and in situ infrared spectroscopy (SNIFTIR and ATR-SEIRAS) experiments compared with those previously obtained with thiourea (TU). In addition, optimized geometries and theoretical harmonic vibrational frequencies were obtained for adsorbed FDS, TU and thioureate from plane-wave DFT calculations using periodic surface models. These results were compared in the case of TU and thioureate to those previously obtained with a model Au cluster surface with (111) orientation. In the case of FDS, weak adsorption takes place with the S-S bond essentially parallel to the metal surface. No specific bands for adsorbed FDS can be identified in the experimental ATR-SEIRA spectra. These latter spectra suggest that adsorbed thioureate species are spontaneously formed upon dissociative adsorption of FDS when dosing this molecule at open circuit. Some of the adsorbed thioureate species undergo reductive protonation giving rise to a mixed adlayer formed by adsorbed thioureate and thiourea in a surface process which is faster when a controlled potential of 0.70 V is applied. In agreement with the observations reported when dosing TU, the ratio between TU and thioureate adsorbates is found to depend on the electrode potential, being higher for potentials close to the hydrogen evolution limit and decreasing for higher potential values. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 Graphical AbstractHighlights -FDS adsorbs weakly on Au with Au-S distances longer than those for TU and thioureate.-Physisorbed FDS dissociates homolitically to yield adsorbed thioureate.-Some adsorbed thioureate species are reduced to adsorbed thiourea.-Dosing conditions influence the rate of formation of adsorbed thiourea.-The thiourea/thioureate adsorbate ratio depends on the applied potential.

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Surface enhanced infrared spectroscopy—Au(1 1 1-20nm)/sulphuric acid—new aspects and challenges

Cited by 158 publications

References 67 publications

Seeded growth fabrication of Cu-on-Si electrodes for in situ ATR-SEIRAS applications

Seeded growth fabrication of Cu-on-Si electrodes for in situ ATR-SEIRAS applications

Recent Progresses of Electrochemical Surface Science &sim;Importance of Surface Imaging with Atomic Scale&sim;

On the electrochemical behavior of formamidine disulfide on gold electrodes in acid media

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