Investigation of carboxylic-functionalized and n-alkanethiol self-assembled monolayers on gold and their application as pH-sensitive probes using scanning electrochemical microscopy

Boldt, Frank-Mario; Baltes, Norman; Borgwarth, K.; Heınze, Jürgen

doi:10.1016/j.susc.2004.04.062

Cited by 31 publications

(38 citation statements)

References 47 publications

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“…[260] Die SECM erwies sich weiterhin als geeignet, die durch Kettenlänge, Protonierungs-oder Komplexbildungsgleichgewichte veränderten Eigenschaften von terminal funktionalisierten SAMs zu differenzieren. [261,262] Ebenfalls untersucht wurde die ¾nderung des Passivierungsverhaltens von DNA-haltigen SAMs bei der Bindung von zweiwertigen Kationen. [263] Zu erwähnen ist auch der Ansatz von Abbou et al zur Charakterisierung von Polymerketten, die an einem Ende an einer Oberfläche verankert und am anderen Ende mit einer Ferroceneinheit markiert sind.…”

Section: Untersuchung Selbstorganisierter Monolagenunclassified

Elektrochemische Rastermikroskopie zur direkten Abbildung von Reaktionsgeschwindigkeiten

Wittstock¹,

Burchardt²,

Pust³

et al. 2007

Angewandte Chemie

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Eine entscheidende Rolle in der Elektrochemie, aber auch in biologischen Systemen oder beim Transport durch Membranen, spielen lokale Prozesse an Fest‐flüssig‐Grenzflächen oder Flüssig‐flüssig‐Grenzflächen, die z. B. an Defektstellen, an Poren oder an einzelnen Zellen ablaufen und sich durch integrale Untersuchungsverfahren nur schwer erfassen lassen. Mit der elektrochemischen Rastermikroskopie steht eine Untersuchungsmethode für lokale Grenzflächenreaktionen zur Verfügung, die nach zwei Jahrzehnten Entwicklung eine solide theoretische Basis und eine große Zahl von Anwendungen aufweist. Sie bietet die Möglichkeit, Geschwindigkeiten heterogener Reaktionen direkt abzubilden und Oberflächen durch elektrochemisch erzeugte Reaktanten lokal zu modifizieren. Die Vielfalt der Anwendungen reicht von klassischen elektrochemischen Fragestellungen bei der Untersuchung lokaler Korrosionsphänomene und elektrokatalytischer Reaktionen in Brennstoffzellen, von Sensoroberflächen, Biochips und mikrostrukturierten Analysesystemen bis hin zum Massentransport durch synthetische Membranen, Haut und Gewebe sowie interzellulären Kommunikationsprozessen. Außerdem können Prozesse an Flüssigkeitsoberflächen oder an Flüssig‐flüssig‐Grenzflächen untersucht werden.

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Section: Untersuchung Selbstorganisierter Monolagenunclassified

Elektrochemische Rastermikroskopie zur direkten Abbildung von Reaktionsgeschwindigkeiten

Wittstock¹,

Burchardt²,

Pust³

et al. 2007

Angewandte Chemie

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“…[14][15][16][17][18] The procedure was as follows: The Au/mica electrode was annealed using a hydrogen flame and immersed for 5 min without potential control into 20 mM 4, 4 0 -dithiodipyridine aqueous solution, which was deaerated to prevent the oxidation of thiol. The electrode was thoroughly rinsed with water, and then used as a 4, 4 0 -dithiodipyridine-modified self-assembled-monolayer (4-PyS-SAM) working electrode.…”

Section: Experimental Procedures 1 Materials and Solutionsmentioning

confidence: 99%

“…The electrode potential sweep was set for the 4-PyS-SAM from +0.2 to À0:2 V vs. Ag/AgCl in order to avoid the reductive desorption of 4-PyS-SAM, 16) and was regulated for Alk-SAM from +0.2 V to À0:4 V vs. Ag/AgCl. 18) We measured the reductive elimination of each SAM by the reduction of thiol in the SAMs and found that the surface coverage of these SAMs were 4:75 Â 10 À10 , 7:21 Â 10 À10 , 7:52 Â 10 À10 , and 7:83 Â 10 À10 mol cm À2 for 4-PyS-SAM, COOH-, OH-, and NH 2 -Alk-SAM, respectively. The surface coverage obtained for the SAMs was nearly the same as that shown in the literature.…”

Section: Electrochemical Measurement Systemmentioning

confidence: 99%

See 1 more Smart Citation

Sorption of U(VI) on the 4-Mercaptopyridine Self-Assembled Monolayer

Nankawa

Ozaki

Francis

et al. 2008

J. Nucl. Sci. Technol.

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The sorption of U(VI) on the 4-mercaptopyridine self-assembled monolayer (4-PyS-SAM) on Au(111) was studied by cyclic voltammetry. Cyclic voltammograms (CVs) of the 4-PyS-SAM working electrode were obtained by contact with 1 mM UO 2 (NO 3 ) 2 solution, 1 mM UO 2 (NO 3 ) 2 and 50 mM acetic acid solution, or 1 mM UO 2 (NO 3 ) 2 and 50 mM oxalic acid solution for 6 h at pH 4. The reduction current of U(VI) to U(V) was detected in the CV. The CV of the U(VI) associated 4-PyS-SAM after transport to U(VI)-free 0.1 M NaClO 4 solution showed that the reduction current was detected in the cases of UO 2 (NO 3 ) 2 and U(VI)-acetate, but not in the case of U(VI)-oxalate solution, indicating that U(VI) was adsorbed on the 4-PyS-SAM from the UO 2 (NO 3 ) 2 and U(VI)-acetate solutions, but not from U(VI)-oxalate solution. These results suggest that stability of U(VI)-4-PyS-SAM is not so high that U(VI)-4-PyS-SAM cannot be formed in the presence of 50 mM oxalate.

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“…Depending on the potential applied to the electrode, the feedback current can be attributed to direct electron tunneling or ET through pinholes. SECM approach curves with use of different redox mediators show that the insulating properties increase with increasing chain length of the SAM-forming molecule [260]. By use of nanometersized electrodes it was shown that direct electron transfer through the layer, rather than electron transfer at the defects, was dominant and that the size of the defects was 1-100 nm [261].…”

Section: Self Assembled Monolayersmentioning

confidence: 99%

Multidimensional electrochemical imaging in materials science

2007

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In the past 20 years the characterization of electroactive surfaces and electrode reactions by scanning probe techniques has advanced significantly, benefiting from instrumental and methodological developments in the field. Electrochemical and electrical analysis instruments are attractive tools for identifying regions of different electrochemical properties and chemical reactivity and contribute to the advancement of molecular electronics. Besides their function as a surface analytical device, they have proved to be unique tools for local synthesis of polymers, metal depots, clusters, etc. This review will focus primarily on progress made by use of scanning electrochemical microscopy (SECM), conductive AFM (C-AFM), electrochemical scanning tunneling microscopy (EC-STM), and surface potential measurements, for example Kelvin probe force microscopy (KFM), for multidimensional imaging of potential-dependent processes on metals and electrified surfaces modified with polymers and self assembled monolayers.

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Investigation of carboxylic-functionalized and n-alkanethiol self-assembled monolayers on gold and their application as pH-sensitive probes using scanning electrochemical microscopy

Cited by 31 publications

References 47 publications

Elektrochemische Rastermikroskopie zur direkten Abbildung von Reaktionsgeschwindigkeiten

Elektrochemische Rastermikroskopie zur direkten Abbildung von Reaktionsgeschwindigkeiten

Sorption of U(VI) on the 4-Mercaptopyridine Self-Assembled Monolayer

Multidimensional electrochemical imaging in materials science

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