A study of kinetics of adsorption of alkanethiols on gold using electrochemical impedance spectroscopy

Subramanian, Raman; Lakshminarayanan, V.

doi:10.1016/s0013-4686(00)00512-0

Cited by 101 publications

(138 citation statements)

References 18 publications

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“…Table 2 gives values of capacitance per unit area from analysis of 1-dodecanethiol monolayers formed at different potentials. Most of the resulting values fall in the range 1.1 ± 1.6 mF cm À2 as found in other work [16,32]. Interestingly, within the range of potential and assembly time investigated, the monolayer capacitance seems not to depend either on the value of applied potential or on the assembly time.…”

Section: Electrochemical Impedance Spectroscopysupporting

confidence: 80%

“…Previous recent studies in the literature using electrochemical impedance have concentrated on monitoring adsorption kinetics [16,18], characterization of defects and possibility of any electron transfer through the monolayer film [29,30]. Our results to be described below show that, under the formation conditions employed, there is no evidence of defects in the monolayer or electron transfer through it.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 54%

“…Evidence is that adsorption occurs quickly followed by a slow reorganization of the adsorbed layer over a period of many hours [16,17]. Applying a positive potential can alter the characteristics of the monolayers formed and increase the kinetics of formation [18 ± 21].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2003

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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.

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Section: Electrochemical Impedance Spectroscopysupporting

confidence: 80%

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 54%

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

et al. 2003

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“…The oxidative adsorption of alkanethiolates on a gold surface can be used to form the thiol SAM and has been also studied electrochemically [37,38] as well as with EQCM [31,32,39] but much less compared with the reductive desorption.…”

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

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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

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“…Considering that the electrode behavior is described by a capacitor [25,26] (representing the clean part of the electrode) in a branch parallel to a serial capacitors assembly [27] (representing the covered part of the electrode), the coverage ratio is estimated to be 0.71 for DC1, and the decane-thiol layer capacitance is estimated to be about 0.8 µF/cm 2 , in agreement with reported values [28]. The current flowing through the electrode is recorded during cyclic voltammetry scans.…”

Section: Electrochemical Response Of the Microcantilevers Arraymentioning

confidence: 99%

Charge redistribution in electrochemically actuated mechanical sensors

Amiot

Kanoufi

Hild

et al. 2009

Sensors and Actuators A: Physical

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to real-life applications also requires the monitored mechanical effect to be highly specific. Moving towards more specificity in cantilever-based sensing, monitoring the mechanical response of electrochemically actuated microcantilevers is then thought to provide a fast, reliable and complementary experimental information to the longtime cantilever bending measurement for the detection of target molecules. Full-field measurements are therefore used to investigate the way the electro-elastic coupling is altered when a microcantilever undergoes decane-thiol adsorption. The proposed technique reveals that the latter results in a charge density redistribution along the cantilever in addition to the local surface passivation. Focusing on the cantilever tip displacement under electrochemical actuation, this redistribution partially compensates the electro-elastic coupling alteration due to the surface passivation, therefore possibly yielding an ambiguous detection result. This effect should be taken into account for the optimal design of specific electrochemically actuated mechanical sensors.

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A study of kinetics of adsorption of alkanethiols on gold using electrochemical impedance spectroscopy

Cited by 101 publications

References 18 publications

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

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

Charge redistribution in electrochemically actuated mechanical sensors

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