Adsorption and surface structural chemistry of thiophenol, benzyl mercaptan, and alkyl mercaptans.  Comparative studies at silver(111) and platinum(111) electrodes by means of Auger spectroscopy, electron energy loss spectroscopy, low energy electron diffraction and electrochemistry

Gui, John Y.; Stern, Donald A.; Frank, Douglas G.; Lu, Frank K.; Zapien, Donald C.; Hubbard, Arthur T.

doi:10.1021/la00053a024

Cited by 128 publications

(130 citation statements)

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“…34 Large differences in the structures of thiolate monolayers on different substrates have already been observed by many groups. 9,14,16,23,30 -32,35 -40 Many previous measurements have shown that the chain of adsorbed long-chain alkanethiols is significantly more tilted for molecules adsorbed on Au than on Ag supports.…”

Section: Influence Of the Metal Substrate And The Terminal Groupmentioning

confidence: 85%

Structures of monolayers formed from different HS—(CH₂)₂—X thiols on gold, silver and copper: comparitive studies by surface‐enhanced Raman scattering

Kudelski

2003

J Raman Spectroscopy

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Molecules of 2-aminoethanethiol (cysteamine, CYS), 2-mercaptoethanol (MET), 3-mercaptopropionic acid (MPA), sodium 2-mercaptoethanesulphonate (MES) and 1-propanethiol (PTH) were spontaneously chemisorbed on electrochemically activated silver, copper and gold surfaces. The structure of monolayers formed was studied with surface-enhanced Raman scattering (SERS). In CYS and MPA monolayers the relative surface concentration of gauche conformers was higher than in MET, PTH and MES monolayers. This is probably due to double bonding to the metal surface by a fraction of adsorbed MPA and CYS molecules (via the sulphur moiety and the terminal carboxylic or amino group). In CYS, MET, MPA and PTH monolayers the surface concentration of trans conformers is significantly higher on Ag than on Au or Cu. The structures of MES monolayers on Ag, Au and Cu are similar, with very high surface concentrations of trans conformers. Statistically, the wavenumbers of n(C-S) bands of both gauche and trans conformers are the highest on Au, slightly lower on Ag and the lowest for Cu. However the positions of n(C-S) bands are also sensitive to the other parameters (e.g. C -C -S -metal torsion angle, the overall ordering of the monolayer). Therefore, the wavenumbers of n(C-S) bands are not good indicators of differences in the interaction between chemisorbed thiols and the metal substrates. Desorption measurements suggest that part of the adsorbed molecules is bonded significantly weaker than the rest. Thiolate monolayers on Cu decomposed relatively easily, forming a layer of copper sulphide. The strength of adsorbed MPA acid is similar on all substrates.

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Section: Influence Of the Metal Substrate And The Terminal Groupmentioning

confidence: 85%

Structures of monolayers formed from different HS—(CH₂)₂—X thiols on gold, silver and copper: comparitive studies by surface‐enhanced Raman scattering

Kudelski

2003

J Raman Spectroscopy

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“…While Au (111) is clearly the most commonly used substrate for SAMs, also various crystal faces of silver, [207][208][209][210] copper, [211][212][213][214] palladium, [215][216][217] and platinum [207,[218][219][220] have been experimentally investigated. Also (liquid) mercury has been used.…”

Section: Impact Of the Substrate Metalmentioning

confidence: 99%

Modeling the Electronic Properties of π‐Conjugated Self‐Assembled Monolayers

2010

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The modification of electrode surfaces by depositing self-assembled monolayers (SAMs) provides the possibility for controlled adjustment of various key parameters in organic and molecular electronic devices. Most important among them are the work function of the electrode and the relative alignment of its Fermi level with the conducting states in the SAM itself and with those in a subsequently deposited organic semiconductor. For the efficient application of such interface modifications it is crucial to reach a proper understanding of the relation between the chemical structure of a molecule, its molecular electronic characteristics, and the properties of the SAM formed by such molecules. Over the past years, quantum-mechanical calculations have proven to be a valuable tool for reaching a fundamental understanding of the relevant structure-property relations. Here, we provide a review over the field and report on recent progress in the modeling of the interfacial electronic properties of pi-conjugated SAMs. In addition to the insight that can be gained from simple electrostatic considerations, we focus on the quantum-mechanical description of the roles played by substituents, molecular backbones, chemical anchoring groups, and the packing density of molecules on the surface. Furthermore, we explicitly address the energy-level alignment at the interface between a prototypical organic semiconductor and a SAM-covered metal electrode and describe an approach suitable for extending the metallic character of the substrate onto the monolayer.

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“…The three analytes adsorb to the surface (chemisorbed for TP and physisorbed for MGO & R6G) of the negatively charged AgNPs as R6G and MGO are positively charged dyes, while TP has a thiol group which has a great affinity towards silver [34][35][36]. The two dyes have been extensively studied in SERS experiments as they have reliable photostability [35,37,38].…”

Section: Surface Enhanced Raman Scatteringmentioning

confidence: 99%

“…G is calculated as: [36]. To ensure monolayer coverage around the nanoparticles a concentration of 1.6x10 -6 M of analyte was used (see figure S4 in the supporting information).…”

Section: Surface Enhanced Raman Scatteringmentioning

confidence: 99%

Synthesis of size tunable monodispersed silver nanoparticles and the effect of size on SERS enhancement

Cassar

Graham

Larmour

et al. 2014

Vibrational Spectroscopy

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This version is available at https://strathprints.strath.ac.uk/47444/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractSpherical and monodispersed silver nanoparticles (AgNPs) are ideal for fundamental research as the contribution from size and shape can be accounted for in the experimental design. In this paper a seeded growth method is presented, whereby varying the concentration of sodium borohydride reduced silver nanoparticle seeds different sizes of stable spherical nanoparticles with a low polydispersity nanoparticles are produced using hydroquinone as a selective reducing agent. The surface-enhanced Raman scattering (SERS) enhancement factor for each nanoparticle size produced (17, 26, 50, & 65 nm) was then assessed using three different analytes, rhodamine 6G (R6G), malachite green oxalate (MGO) and thiophenol (TP). The enhancement factor gives an indication of the Raman enhancement effect by the nanoparticle. Using non-aggregated conditions and two different laser excitation wavelength (633 nm and 785 nm) it is shown that an increase in particle size results in an increased enhancement for each analyte used.

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Adsorption and surface structural chemistry of thiophenol, benzyl mercaptan, and alkyl mercaptans. Comparative studies at silver(111) and platinum(111) electrodes by means of Auger spectroscopy, electron energy loss spectroscopy, low energy electron diffraction and electrochemistry

Cited by 128 publications

References 1 publication

Structures of monolayers formed from different HS—(CH₂)₂—X thiols on gold, silver and copper: comparitive studies by surface‐enhanced Raman scattering

Structures of monolayers formed from different HS—(CH₂)₂—X thiols on gold, silver and copper: comparitive studies by surface‐enhanced Raman scattering

Modeling the Electronic Properties of π‐Conjugated Self‐Assembled Monolayers

Synthesis of size tunable monodispersed silver nanoparticles and the effect of size on SERS enhancement

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Adsorption and surface structural chemistry of thiophenol, benzyl mercaptan, and alkyl mercaptans. Comparative studies at silver(111) and platinum(111) electrodes by means of Auger spectroscopy, electron energy loss spectroscopy, low energy electron diffraction and electrochemistry

Cited by 128 publications

References 1 publication

Structures of monolayers formed from different HS—(CH2)2—X thiols on gold, silver and copper: comparitive studies by surface‐enhanced Raman scattering

Structures of monolayers formed from different HS—(CH2)2—X thiols on gold, silver and copper: comparitive studies by surface‐enhanced Raman scattering

Modeling the Electronic Properties of π‐Conjugated Self‐Assembled Monolayers

Synthesis of size tunable monodispersed silver nanoparticles and the effect of size on SERS enhancement

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Product

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Structures of monolayers formed from different HS—(CH₂)₂—X thiols on gold, silver and copper: comparitive studies by surface‐enhanced Raman scattering

Structures of monolayers formed from different HS—(CH₂)₂—X thiols on gold, silver and copper: comparitive studies by surface‐enhanced Raman scattering