Surface-Enhanced Raman Scattering (SERS) Study of Mercaptoethanol Monolayer Assemblies on Silver Citrate Hydrosol. Preparation and Characterization of Modified Hydrosol as a SERS-Active Substrate

Tarabara, Vladimir V.; Nabiev, Igor; Feofanov, Alexei V.

doi:10.1021/la9709711

Cited by 51 publications

(44 citation statements)

References 25 publications

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“…Previous investigations demonstrated that thiol molecules can covalently adsorb on the surface of copper substrates [16] and selenium can be dissolved in thiolate to form selenothiolate, [17] which suggests that copper could react with selenothiolate to form copper selenides. The reaction between copper and selenothiolate (or thiosulfide) was thus theoretically calculated using hydroxyethylthioselenide (or hydroxyethylthiosulfide) and Cu NW as models through the DMol3 module in the Materials Studio software package.…”

Section: Resultsmentioning

confidence: 99%

Room‐Temperature Synthesis of Cu_2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

Chen

Bai

et al. 2014

Chemistry A European J

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Copper chalcogenide nanostructures (e.g. one-dimensional nanotubes) have been the focus of interest because of their unique properties and great potential in various applications. Their current fabrications mainly rely on high-temperature or complicated processes. Here, with the assistance of theoretical prediction, we prepared Cu(2-x)E (E = S, Se) micro-/nanotubes (NTs) with a hierarchical architecture by using copper nanowires (Cu NWs), stable sulfur and selenium powder as precursors at room temperature. The influence of reaction parameters (e.g. precursor ratio, ligands, ligand ratio, and reaction time) on the formation of nanotubes was comprehensively investigated. The resultant Cu(2-x)E (E = S, Se) NTs were used as counter electrodes (CE) of quantum-dot-sensitized solar cells (QDSSCs) to achieve a conversion efficiency (η) of 5.02 and 6.25%, respectively, much higher than that of QDSSCs made with Au CE (η = 2.94%).

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Section: Resultsmentioning

confidence: 99%

Room‐Temperature Synthesis of Cu_2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

Chen

Bai

et al. 2014

Chemistry A European J

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“…One of the simplest methods to determine the structure of alkanethiolate monolayers is analysis of their Raman spectra in the region around 700 cm 1 band at lower wavenumber is characteristic of a gauche conformer of the S-C-C chain, whereas the band at higher wavenumber is typical of a trans conformer 5,8,9 (structures of the S-C-C chain in trans and gauche conformations are presented in Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…17 -19 It is also well known that the actual structure of thiol layers is very important in many applications. 5,20 Therefore, our previous Raman spectroscopic studies have involved the structural characterization of monolayers formed from various short-chain ω-substituted alkanethiols HS-(CH 2 2 -X with X D NH 2 , 17,21 -23 OH, 24 COOH, 25 CH 3 24 and SO 3 Na 26 (when X D H, self-assembled monolayers are not formed) 24 and detailed determination of the influence of the surroundings on their structure. Usually, we have only investigated the monolayers formed on silver substrates.…”

Section: Introductionmentioning

confidence: 99%

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

100

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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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“…3, the intensity ratio of the C -S T and C -S G bands of MPA is ¾1. According to Tarabara et al, 24 for chemisorbed HS CH 2 2 OH the ratio of SERS cross sections of trans and gauche (C -S) bands is 0.36 š 0.06. Therefore, the relative surface concentration of the trans conformer should be significantly higher than the relative intensity of the C -S T band in comparison with C -S G .…”

Section: Resultsmentioning

confidence: 98%

Monolayers of sulfur‐containing molecules at metal surfaces as studied using SERS: 3, 3′‐thiodipropionic acid and 3‐mercaptopropionic acid adsorbed on silver and copper

Kudelski

Michota

Bukowska

2005

J Raman Spectroscopy

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The modification of metal surfaces with self-assembled thiol monolayers is the subject of intensive studies owing to both its fundamental interest in surface chemistry and its potential technological significance. In this work, the applicability of surface-enhanced Raman scattering (SERS) to determine the conformation and pK a values of !-terminated thiol molecules was investigated. 3, 3 -Thiodipropionic acid (TDPA) and 3-mercaptopropionic acid (MPA) monolayers were spontaneously formed on silver and copper surfaces by adsorption from TDPA and MPA solutions, respectively. The structure of the monolayers formed was determined from SERS measurements. The SERS investigations showed that molecules forming TDPA monolayers prefer to adopt a gauche conformation of the -S -C -C chains, whereas in MPA monolayers formed from 1 mM MPA aqueous solution a significant part of the adsorbed molecules adopts a trans conformation. Formation on the metal surface of an MPA monolayer with high surface coverage of MPA makes dissociation of the carboxylic groups of MPA significantly more difficult. Analogous changes in the strength of similar adsorbed compounds have been reported by other groups. In contrast to those results, we found that the formation of monolayers from TDPA increases its acidic strength even at high surface coverage when monolayers are formed from relatively concentrated TDPA solutions. Probably the interaction of carboxylic groups with the metal surface is easier for TDPA than for MPA for geometric reasons. We consider that ionization of carboxylic groups increases the strength of this interaction.

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Surface-Enhanced Raman Scattering (SERS) Study of Mercaptoethanol Monolayer Assemblies on Silver Citrate Hydrosol. Preparation and Characterization of Modified Hydrosol as a SERS-Active Substrate

Cited by 51 publications

References 25 publications

Room‐Temperature Synthesis of Cu_2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

Room‐Temperature Synthesis of Cu_2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

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

Monolayers of sulfur‐containing molecules at metal surfaces as studied using SERS: 3, 3′‐thiodipropionic acid and 3‐mercaptopropionic acid adsorbed on silver and copper

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Surface-Enhanced Raman Scattering (SERS) Study of Mercaptoethanol Monolayer Assemblies on Silver Citrate Hydrosol. Preparation and Characterization of Modified Hydrosol as a SERS-Active Substrate

Cited by 51 publications

References 25 publications

Room‐Temperature Synthesis of Cu2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

Room‐Temperature Synthesis of Cu2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

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

Monolayers of sulfur‐containing molecules at metal surfaces as studied using SERS: 3, 3′‐thiodipropionic acid and 3‐mercaptopropionic acid adsorbed on silver and copper

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Product

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Room‐Temperature Synthesis of Cu_2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

Room‐Temperature Synthesis of Cu_2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

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