The influence of surfactants on the electron-transfer reaction at self-assembled thiol monolayers modifying a gold electrode

Wang, Jun; Zeng, Baizhao; Fang, Cheng; Zhou, Xingyao

doi:10.1016/s0022-0728(00)00045-0

Cited by 74 publications

(37 citation statements)

References 18 publications

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“…When necessary, gold electrode on the QCM or mercury drop electrode were also used as the working electrode, as in Figures 1, 2 , respectively, which were measured with the corresponding method [9,11,19]. Saturated calomel electrode (SCE) the reference electrode and all the potentials were listed versus it in this article.…”

Section: Apparatusmentioning

confidence: 99%

“…The polar terminate head of the filmforming molecule is the key to bring about the ion-gate response of the film, which can be activated by proton or by metallic ions in the solution [7,8]. Sometimes, it can also be activated by some surfactants, as reported by us [9]. Moreover, the polar head can be employed to preconcentrate some kinds of metallic ions for detection.…”

Section: Introductionmentioning

confidence: 96%

“…Glutathione (g-l-glutamyl-l-cysteinyl-glycine, GSH) SAM was studied in our previous works [9,11]. The investigation on the redox process occurred on the GSH monolayer is considered to be necessary to understand the trans-membrane electron and ion exchange process at the biologically active membranes.…”

Section: Introductionmentioning

confidence: 99%

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Voltammetry and EQCM Investigation of Glutathione Monolayer and Its Complexation with Cu²⁺

Fang¹,

Zhou²

2003

Electroanalysis

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The glutathione (GSH) self-assembled monolayer and its compexlation with Cu 2 were studied by using voltammetry and EQCM. It was found that the monolayer could rearrange during the redox process of Cu 2 /Cu . The protonating, or not, of the carboxyl terminates of the adsorpted GSH molecules influence the compexlation interaction significantly for they are the key binding sites. The GSH monolayer had the capacity to accumulate Cu 2 and the monolayer modified gold electrode was employed to detect the low levels of Cu 2 with a limit of 1.0 Â 10 À10 mol L À1.

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Section: Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Voltammetry and EQCM Investigation of Glutathione Monolayer and Its Complexation with Cu²⁺

Fang¹,

Zhou²

2003

Electroanalysis

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“…This indicates that there exist diffusion and convection in the monolayer at higher temperature. Carboxyl group of GSH is deprotonized in neutral solution and this monolayer has net negative charge [9]. Although there exists electrostatic repulsion between the Fe(CN) 6 3À/4À and the negatively charged monolayer, Fe(CN) 6 3À/4À easily diffuse in the monolayer due to less density and the worse order of the monolayer than those of MUA monolayer on gold surface.…”

Section: Cvs Of Fe(cn)mentioning

confidence: 99%

Electrochemical Studies of Thiol Self‐Assembled Monolayers at a Heated Gold‐Wire Microelectrode

Wang

Gründler

2003

Electroanalysis

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Mercaptoundecanoic acid (MUA) and glutathione (GSH) self-assembled monolayers were prepared on gold-wire microelectrode. Cyclic voltammetry was used to investigate the influence of temperature on electrochemical behaviors of Fe(CN) 6 3À/4À and Ru(NH 3 ) 6 3/2 at these SAMs modified electrodes in aqueous solution. It is found that temperature shows great influence on electron transfer (ET) and mass transport (MT) for the two SAMs modified electrodes and the influence of temperature depends on the charge properties of the redox couples and terminal groups of SAMs and the structure of the monolayer on gold surface. The temperature can greatly increase MT rate of Fe(CN) 6 3À/4À at both MUA and GSH modified electrodes. However, the increased MT rate doesn×t have any effect on the CV×s for Fe(CN) 6 3À/4À /MUA system. For Ru(NH 3 ) 6 3/2 , temperature can greatly improve the electrochemical reaction in both MUA and GSH modified electrodes, which is ascribed to temperature-induced diffusion and convection and the electrostatic interaction between Ru(NH 3 ) 6 3/2 and negatively charged carboxyl groups on the electrode surface.

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“…However, the electron transfer at a thiol derivatives modified electrode with coexisting surfactants has not received much attention, and results concerning this matter are somewhat inconclusive. 32 Electrochemical impedance spectroscopy (EIS) has proved to be a valuable technique in extensive application areas, such as electrode kinetics, membranes, conducting polymers, semiconductors, surface treatment, batteries and fuel cells. Especially, in the research of interface phenomena, even using a simple electrolyte, EIS can provide much more prolific information about the stability of SAMs, their barrier properties and the degree of perfection than traditional electrochemical techniques.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Studies of Derivatized Thiol Self-Assembled Monolayers on Gold Electrode in the Presence of Surfactants

et al. 2005

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Electrochemical impendence spectroscopy (EIS), cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were performed to investigate the barrier properties and electron transfer of derivatized thiol self-assembled monolayers (SAMs) on gold in the presence of surfactants. The thiol derivatives used included 2-mercaptoethanesulfonic acid (MES), 2-mercaptoacetic acid (MAA), and N-acetyl-L-cysteine (NAC). A simple equivalent circuit was derived to fit the impedance spectra very well. The negative redox probe [Fe(CN)6] 3-/4-was selected to indicate the electron-transfer efficiency on the interface of the studied electrodes. It was found that by changing the surface structure of SAMs, different surfactants could regulate the barrier properties and electron-transfer efficiency in different ways. A positively charged surfactant lowered the electrostatic repulsion between the negative redox probe and negatively charged surface groups of a monolayer, while enhancing the reversibility of electron transfer by virtue of increasing the redox probe concentration within the electric double-layer region. A neutral surfactant showed no significant effect, while a negative surfactant hindered the access and reaction of redox probe by electrostatic repulsion of same-sign charges.

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The influence of surfactants on the electron-transfer reaction at self-assembled thiol monolayers modifying a gold electrode

Cited by 74 publications

References 18 publications

Voltammetry and EQCM Investigation of Glutathione Monolayer and Its Complexation with Cu²⁺

Voltammetry and EQCM Investigation of Glutathione Monolayer and Its Complexation with Cu²⁺

Electrochemical Studies of Thiol Self‐Assembled Monolayers at a Heated Gold‐Wire Microelectrode

Electrochemical Studies of Derivatized Thiol Self-Assembled Monolayers on Gold Electrode in the Presence of Surfactants

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The influence of surfactants on the electron-transfer reaction at self-assembled thiol monolayers modifying a gold electrode

Cited by 74 publications

References 18 publications

Voltammetry and EQCM Investigation of Glutathione Monolayer and Its Complexation with Cu2+

Voltammetry and EQCM Investigation of Glutathione Monolayer and Its Complexation with Cu2+

Electrochemical Studies of Thiol Self‐Assembled Monolayers at a Heated Gold‐Wire Microelectrode

Electrochemical Studies of Derivatized Thiol Self-Assembled Monolayers on Gold Electrode in the Presence of Surfactants

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Voltammetry and EQCM Investigation of Glutathione Monolayer and Its Complexation with Cu²⁺

Voltammetry and EQCM Investigation of Glutathione Monolayer and Its Complexation with Cu²⁺