Electrochemical quartz crystal microbalance studies of adsorption and desorption of self-assembled monolayers of alkyl thiols on gold

Schneider, T.; Buttry, Daniel A.

doi:10.1021/ja00079a021

Cited by 282 publications

(282 citation statements)

References 2 publications

Supporting

Mentioning

261

Contrasting

Unclassified

Order By: Relevance

“…Solubility of the thiol molecule in a given solvent plays a key role in the formation of SAMs. [52][53][54] Based on our combined observations of thiol solubility, our CV measurements, and fluorescence microscopy data we can infer the composition and extent of SAM formation on Au substrates in our aqueous solutions.…”

Section: Effect Of Adsorption Solvent On Sam Formationmentioning

confidence: 99%

Formation and removal of alkylthiolate self-assembled monolayers on gold in aqueous solutions

Canaria

Maloney

et al. 2006

Lab Chip

View full text Add to dashboard Cite

We report the development of novel reagents and approaches for generating recyclable biosensors. The use of aqueous media for the formation of protein binding alkylthiolate monolayers on Au surfaces results in accelerated alkylthiolate monolayer formation and improvement in monolayer integrity as visualized by fluorescence microscopy and CV techniques. We have also developed an electrocleaning protocol that is compatible with microfluidics devices, and this technique serves as an on-chip method for cleaning Au substrates both before and after monolayer formation. The techniques for the formation and dissociation of biotinylated SAMs from aqueous solvents reported here may be applied towards the development of Au-based sensor devices and microfluidics chips in the future. A potential use of these devices includes the specific capture and triggered release of target cells, proteins, or small molecules from liquid samples.

show abstract

Section: Effect Of Adsorption Solvent On Sam Formationmentioning

confidence: 99%

Formation and removal of alkylthiolate self-assembled monolayers on gold in aqueous solutions

Canaria

Maloney

et al. 2006

Lab Chip

View full text Add to dashboard Cite

show abstract

“…Therefore, control experiments during which the complete procedure of 1-dodecanethiol assembly was simulated in the absence of 1-dodecanethiol were performed and the ferro/ferricyanide redox couple was used to probe the surface activity of gold electrodes. Figure 4a shows cyclic voltammograms in phosphate buffer 1 mM K 4 [Fe(CN) 6 ] of two clean gold electrodes both of which were immersed in the ethanolic sodium perchlorate solution (supporting electrolyte used for all 1-dodecanethiol assembly experiments) for 300 s, one at open circuit and the other at an applied potential of 0.6 V. The voltammograms are essentially equal, so that it can be assumed that the nature of the surface after both treatments is identical. Similar blank treatments at different potentials yielded equivalent voltammetric characteristics as depicted in the figure.…”

Section: Voltammetric Characterization Of Sams Compared To Clean Goldmentioning

confidence: 99%

“…The self-assembly method does not require anaerobic or anhydrous conditions. SAMs also provide a means of attaching to the electrode a diverse set of structures ranging from modified monolayers to multilayers, e.g., [6,7].…”

Section: Introductionmentioning

confidence: 99%

Studies on Self‐Assembled Alkanethiol Monolayers Formed at Applied Potential on Polycrystalline Gold Electrodes

et al. 2003

View full text Add to dashboard Cite

1-Dodecanethiol assembly on polycrystalline gold electrodes at fixed positive potentials has been investigated by chronoamperometry and electrochemical quartz crystal microbalance and the films formed characterized by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that 1-dodecanethiol adsorption on gold is enhanced by application of positive potentials to the electrode surface and that adsorption proceeds faster than in the case of open circuit deposition. Compact defect-free monolayers of capacitance values of 1.1 ± 1.6 mF cm À2 are produced in time intervals as short as 100 s, with no roughness, as demonstrated for the first time by electrochemical impedance analysis. Control of surface potential during alkanethiol assembly appears to improve monolayer quality and to allow for shorter assembly periods. Monolayers can be removed by cycling in alkaline solution or in dilute sulfuric acid. These results are important for the fast construction of defect-free bilayers.

show abstract

“…Au -SR + e -=> Au + RS - (1) many electrochemical studies of the reaction (1) have been carried out because the peak area and the shape of the cathodic peak for the reductive desorption and its peak potential provide useful information of the SAM such as the adsorbed amount, stability, adsorption energy, orientation, and substrate morphology [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. For example, it was found that the longer the alkylchain, the more negative the reductive peak potential, reflecting the stronger van der Waals attractive interaction among alkylchains [17].…”

Section: Introductionmentioning

confidence: 99%

“…For example, it was found that the longer the alkylchain, the more negative the reductive peak potential, reflecting the stronger van der Waals attractive interaction among alkylchains [17]. The reductive desorption process has been investigated by many techniques including electrochemistry [17][18][19][20][21][22][23][24][25][26], FT-IR [27][28][29], electrochemical QCM [30][31][32], and in situ STM [33][34][35][36]. Several groups suggested the formation of an "aggregate" or "micelle" near or on the electrode surface after the reductive desorption of the SAM [28,33,35].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical oxidative adsorption and reductive desorption of a self-assembled monolayer of decanethiol on the Au(111) surface in KOH+ethanol solution

Sumi

Wano

Uosaki

2003

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

The electrochemical characteristics of an Au(111) electrode were investigated in 0.1 M KOH ethanol solutions containing various concentrations of decanethiol. Anodic and cathodic peaks corresponding to the oxidative adsorption and reductive desorption, respectively, of a self-assembled monolayer (SAM) of decanethiol were observed. Both peaks negatively shifted with the increase in the thiol concentration by ca. 57 mV/decade, showing that the redox process is a one-electron process. The adsorbed amount determined from the charge corresponding to the reductive desorption increased with an increase in the decanethiol concentration but never reached the saturated amount as long as the cyclic voltammograms were continuously recorded with the sweep rate of 10 -200 mV s-1. It increased with the holding time at +0.1 V, which was much more positive than the anodic peak potential, and reached the saturated amount in ca. 10 min in the 10 μM thiol solution. The reductive peak potential also negatively shifted with the holding time but for a longer period. It kept shifting for ca. 60 min in the 10 μM thiol solution, which is much longer than the time when the adsorbed amount reached the saturated value. These results suggest that the formation of a highly ordered SAM requires a much longer time than the adsorption of the thiol.2

show abstract

Electrochemical quartz crystal microbalance studies of adsorption and desorption of self-assembled monolayers of alkyl thiols on gold

Cited by 282 publications

References 2 publications

Formation and removal of alkylthiolate self-assembled monolayers on gold in aqueous solutions

Formation and removal of alkylthiolate self-assembled monolayers on gold in aqueous solutions

Studies on Self‐Assembled Alkanethiol Monolayers Formed at Applied Potential on Polycrystalline Gold Electrodes

Electrochemical oxidative adsorption and reductive desorption of a self-assembled monolayer of decanethiol on the Au(111) surface in KOH+ethanol solution

Contact Info

Product

Resources

About