The effect of concentration on the oxidative deposition of a monolayer of alkylthiolate on gold: from island formation to random adsorption

Qu, Deyu; Morin, Mario

doi:10.1016/j.jelechem.2003.10.017

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…Simultaneously, m s (CH 3 ) at 2880 cm À1 and m as (CH 3 ) at 2965 cm À1 , together with m as (CH 2 ) at 2855 cm À1 grew, showing that the alkyl chain part is gradually standing up to form tightly packed DDeT-rich domains. The change in the orientation is in agreement with the process of forming single-component alkanethiol SAMs [38,[42][43][44]. Fig.…”

Section: Formation Of Ddet-rich Domainssupporting

confidence: 84%

Concentration-dependent switching of the mode of phase separation in ternary self-assembled monolayers of 2-mercaptoethane sulfonic acid, 2-aminoethanethiol and 1-dodecanethiol on Au(1 1 1)

Phong¹,

Соколов²,

Nishi³

et al. 2007

Journal of Electroanalytical Chemistry

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Section: Formation Of Ddet-rich Domainssupporting

confidence: 84%

Concentration-dependent switching of the mode of phase separation in ternary self-assembled monolayers of 2-mercaptoethane sulfonic acid, 2-aminoethanethiol and 1-dodecanethiol on Au(1 1 1)

Phong¹,

Соколов²,

Nishi³

et al. 2007

Journal of Electroanalytical Chemistry

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“…The lack of a diffusion-controlled response in Figure a eliminates the possibility that alkanethiols are simply oxidized to disulfides (a). This assertion is further supported by the fact that the oxidation wave decreases with increasing concentration, contrary to what would be expected for (a) . The oxidative adsorption of thiols under these conditions (b) does not appear to be responsible for the irreversible oxidation wave observed in Figure a.…”

Section: Resultsmentioning

confidence: 56%

Electrochemically Assisted Self-Assembly of Alkylthiosulfates and Alkanethiols on Gold: The Role of Gold Oxide Formation and Corrosion

Pillai¹,

Braun²,

Freund³

2009

Langmuir

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Electrochemically directed self-assembly of alkylthiosulfates enables the selective formation of monolayers on gold surfaces. These monolayers are identical to those formed from the corresponding alkanethiols. However, the mechanistic details of monolayer formation under electrochemical conditions as well as the role of other variables and residual water in the solvent have not been extensively studied. A systematic investigation shows that self-assembly is not a result of an outer-sphere one-electron oxidation of alkylthiosulfate. Voltammetry and electrochemical quartz crystal microbalance techniques reveal that self-assembly involving alkylthiosulfates as well as alkanethiols under oxidative conditions proceed through direct reaction with gold oxide and in some cases is accompanied by corrosion. X-ray photoelectron spectroscopy indicates that monolayers can undergo rapid exchange with molecules in solution under electrochemically directed self-assembly conditions.

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“…Of those, the bands at 1297 and 1179 cm -1 more rapidly raise. This is due to the fact that, initially, when PET SAM is immersed in solution of AET, molecules transfer to the electrode surface and adsorb on vacant sites on Au-NPs, followed by a change their orientation from lying-down phase to standing-up phase for stabilization [34][35][36]. This process makes the surface of alkyl chain become more perpendicular to the surface.…”

mentioning

confidence: 99%

Effects of Introducing 2-aminoethanethiol into 4-pyridineethanethiol Self-assembled Monolayer Applicable to Enhance Sensitivity of Hg(II) Electrochemical Analysis

Phong

Huyen

Anh

et al. 2015

J. New Mat. Electrochem. Sys.

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In our work, enhancement of sensitivity of Hg(II) determination by introducing 2-aminoethanethiol (AET) from solutions into the self-assembled monolayers (SAMs) of 4-pyridineethanethiol (PET) on gold nanoparticles (Au-NPs) capped on glassy carbon electrode was studied. The formation of binary SAMs was indicated by the shift of reductive desorption peak to negative potentials in voltammograms recorded in 0.5 M KOH solution. Effects of introduction AET were monitored by FTIR that there was a rapid increase of intensities at bands of 1296 and 1189 cm-1 ascribed to (C-H) ring deformation and (C-N) ring stretching, respectively, with increasing immersion time. However, these bands became lower with prolonging more time as well as increasing the concentration of AET in solution. These effects were interpreted due to the conformation of pyridine ring and formation of intermolecular hydrogen bonding between PET and AET. The differential pulse voltammetry for reoxidation of Hg(0) showed the increase of peak current induced by the first effect, whereas the later caused the decrease. Since the optimized conditions, the detection limit for the binary SAMs could approach to 3.85 × 10-12 M Hg(II), approximately three times lower than that of PET SAM.

show abstract

The effect of concentration on the oxidative deposition of a monolayer of alkylthiolate on gold: from island formation to random adsorption

Cited by 7 publications

References 30 publications

Concentration-dependent switching of the mode of phase separation in ternary self-assembled monolayers of 2-mercaptoethane sulfonic acid, 2-aminoethanethiol and 1-dodecanethiol on Au(1 1 1)

Concentration-dependent switching of the mode of phase separation in ternary self-assembled monolayers of 2-mercaptoethane sulfonic acid, 2-aminoethanethiol and 1-dodecanethiol on Au(1 1 1)

Electrochemically Assisted Self-Assembly of Alkylthiosulfates and Alkanethiols on Gold: The Role of Gold Oxide Formation and Corrosion

Effects of Introducing 2-aminoethanethiol into 4-pyridineethanethiol Self-assembled Monolayer Applicable to Enhance Sensitivity of Hg(II) Electrochemical Analysis

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