Self-assembled monolayers in electroanalytical chemistry: Application of .omega.-mercaptocarboxylic acid monolayers for electrochemical determination of ultralow levels of cadmium(II)

Turyan, Iva; Mandler, Daniel

doi:10.1021/ac00073a012

Cited by 152 publications

(89 citation statements)

References 53 publications

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“…Short chain alkyl thiols with charged or bulky end groups like mercaptoethane sulfonate (MES), mercaptopropane sulfonate (MPS), mercaptoacetic acid (MAA), mercaptopropionic acid (MPA) or aminoethane thiol (AET) lead to disorganized and porous monolayers on the electrode surface [8]. Longer chains lead to more ordered structures, but self-assembled mono-layers (SAMs) of the less ordered shorter alkyl chain compounds are more useful for analytical applications [8,9]. The disorder in the film allows the analyte to diffuse through the film [10].…”

Section: Introductionmentioning

confidence: 99%

Mercury Detection in Seawater Using a Mercaptoacetic Acid Modified Gold Microwire Electrode

Widmann¹,

Berg²

2005

Electroanalysis

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It is demonstrated here that it is possible to determine mercury in chloride containing media like seawater by anodic stripping voltammetry using a modified electrode. A gold microwire electrode is modified using mercaptoacetic acid (MAA) to eliminate the problem of calomel formation, allowing the mercury to become fully removed from the electrode surface after each scan. In a synthetic salt solution of KNO 3 the sensitivity for mercury was found to be improved by the surface modification. In seawater the sensitivity was not significantly improved possibly because of complexation of the mercury by the abundant chloride; however, the MAA coating prevented the formation of calomel causing the background scan to be free of mercury. Measurements in seawater at various pH values demonstrated that mercury detection is possible at natural pH (around 8); however, best sensitivity was attained at pH 4.8 with a deposition time of 3 min. A peak for copper occurred at more negative potential but did not interfere at this pH. The calibration was linear between 0 and 37 nM mercury with a limit of detection of 1 nM mercury.

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Section: Introductionmentioning

confidence: 99%

Mercury Detection in Seawater Using a Mercaptoacetic Acid Modified Gold Microwire Electrode

Widmann¹,

Berg²

2005

Electroanalysis

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“…For example, Rubinstein and coworkers [7~9] demonstrated that mixed functionalized SAMs could recognize copper ions selectively in the presence of other ions. Mandler and co-workers [10,11] have reported a highly sensitive electrode for cadmium ions and chromium(VI) ions using self-assembled monolayers-based electrodes. S.Berchmans et al [12] studied the formation of nickel hydroxide monolayers on Au through a SAMs, J.Y.Mo [13] presented a method for the determination of dopamine and epinephrine by SAMs.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Electrochemical Behaviour of Hydroquinone at L-cysteine Self-Assembled Monolayers Modified Gold Electrode

Wang

2002

Sensors

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L-Cysteine is combined onto gold electrode to form a self-assembled monolayers modified electrode (L-Cys/Au SAMs) by taking advantage of strong sulfur-gold interaction. ATR-FTIR, SEM, cyclic voltammetry (CV) and impedance were used for the characterization of the film. It shows excellent stability upon voltametric scanning and a good voltametric response towards hydroquinone with the potential ranged from 0.8 to -0.2 V (vs.SCE) in 0.5M HAc-NaAc buffer solution (pH 4.8). The oxidation potential of hydroquinone on the modified electrode shifted negatively about 330 mV as compared with the bare gold electrode. The plot of catalytic current vs.its concentration has a good linear relation in the range of 2.0×10 -6~2.0×10-4 M with the correlation coefficient of 0.9986 and the detection limit of 4.0×10 -7 M by different pulse voltammetry (DPV). Mechanism for the electrocatalytical process has been studied.

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“…One more method for improvement of the voltammetric selectivity is the use of electrodes with monolayers of organic molecules self-organized on the electrode surface [72,[193][194]. For example, ω-carboxylic acids with hydrocarbon chains of different lengths can arrange themselves to the Langmuir palisade on gold or mercury surfaces.…”

Section: Glassy-carbon Electrodesmentioning

confidence: 99%

Modified carbon-containing electrodes in stripping voltammetry of metals

Stozhko

Малахова

Fyodorov

et al. 2008

J Solid State Electrochem

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Papers dealing with modified electrodes made of carbon materials and composites for use in stripping voltammetry of metals have been reviewed. The review consists of two parts, of which the first considers applications of modified glassy carbon and carbon paste electrodes, while the second describes diverse modified carbon-containing composite and microscopic electrodes. Information about modifiers, electrode modification methods, conditions, and limits of detection of elements in different materials has been tabulated. The review covers 550 papers published in Russia and abroad between 1990 and the first half of 2007.

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Self-assembled monolayers in electroanalytical chemistry: Application of .omega.-mercaptocarboxylic acid monolayers for electrochemical determination of ultralow levels of cadmium(II)

Cited by 152 publications

References 53 publications

Mercury Detection in Seawater Using a Mercaptoacetic Acid Modified Gold Microwire Electrode

Mercury Detection in Seawater Using a Mercaptoacetic Acid Modified Gold Microwire Electrode

Studies on the Electrochemical Behaviour of Hydroquinone at L-cysteine Self-Assembled Monolayers Modified Gold Electrode

Modified carbon-containing electrodes in stripping voltammetry of metals

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