A gold-gold oil microtrench electrode for liquid-liquid anion transfer voltammetry

S.E.C. Dale; Y. Chan; P.C. Bulman Page; E.O. Barnes; R.G. Compton; F. Marken

doi:10.1002/elps.201300071

A gold-gold oil microtrench electrode for liquid-liquid anion transfer voltammetry

S.E.C. Dale, Y. Chan, P.C. Bulman Page, E.O. Barnes, R.G. Compton, F. Marken

Research output: Contribution to journal › Article › peer-review

12 Citations (SciVal)

Abstract

Two flat gold electrodes are placed vis-à-vis with an epoxy spacer layer that is etched out to give a ca. 100 μm-deep electrochemically active trench. A water-insoluble oil phase, here the redox system N,N-diethyl-N′N′-didodecyl-phenylenediamine (DDPD) in 4-(3-phenylpropyl)-pyridine (PPP), is immobilized into the trench to allow anion transfer upon oxidation of DDPD (oil) to DDPD (oil). In "mono-potentiostatic mode" quantitative transfer/expulsion of anions into the trench oil phase occurs. However, in "bi-potentiostatic mode" feedback currents dominated by rapid plate-to-plate diffusion normal to the electrode surfaces are observed. Comparison of "normal" diffusion and "lateral" diffusion shows that the rate of diffusion-migration charge transport across the oil film is anion hydrophobicity dependent.

Original language	English
Pages (from-to)	1979-1984
Number of pages	6
Journal	Electrophoresis
Volume	34
Issue number	14
DOIs	https://doi.org/10.1002/elps.201300071
Publication status	Published - Jul 2013

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10.1002/elps.201300071

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abstract = "Two flat gold electrodes are placed vis-{\`a}-vis with an epoxy spacer layer that is etched out to give a ca. 100 μm-deep electrochemically active trench. A water-insoluble oil phase, here the redox system N,N-diethyl-N′N′-didodecyl-phenylenediamine (DDPD) in 4-(3-phenylpropyl)-pyridine (PPP), is immobilized into the trench to allow anion transfer upon oxidation of DDPD (oil) to DDPD (oil). In {"}mono-potentiostatic mode{"} quantitative transfer/expulsion of anions into the trench oil phase occurs. However, in {"}bi-potentiostatic mode{"} feedback currents dominated by rapid plate-to-plate diffusion normal to the electrode surfaces are observed. Comparison of {"}normal{"} diffusion and {"}lateral{"} diffusion shows that the rate of diffusion-migration charge transport across the oil film is anion hydrophobicity dependent.",

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T1 - A gold-gold oil microtrench electrode for liquid-liquid anion transfer voltammetry

AU - Dale, S.E.C.

AU - Chan, Y.

AU - Bulman Page, P.C.

AU - Barnes, E.O.

AU - Compton, R.G.

AU - Marken, F.

PY - 2013/7

Y1 - 2013/7

N2 - Two flat gold electrodes are placed vis-à-vis with an epoxy spacer layer that is etched out to give a ca. 100 μm-deep electrochemically active trench. A water-insoluble oil phase, here the redox system N,N-diethyl-N′N′-didodecyl-phenylenediamine (DDPD) in 4-(3-phenylpropyl)-pyridine (PPP), is immobilized into the trench to allow anion transfer upon oxidation of DDPD (oil) to DDPD (oil). In "mono-potentiostatic mode" quantitative transfer/expulsion of anions into the trench oil phase occurs. However, in "bi-potentiostatic mode" feedback currents dominated by rapid plate-to-plate diffusion normal to the electrode surfaces are observed. Comparison of "normal" diffusion and "lateral" diffusion shows that the rate of diffusion-migration charge transport across the oil film is anion hydrophobicity dependent.

AB - Two flat gold electrodes are placed vis-à-vis with an epoxy spacer layer that is etched out to give a ca. 100 μm-deep electrochemically active trench. A water-insoluble oil phase, here the redox system N,N-diethyl-N′N′-didodecyl-phenylenediamine (DDPD) in 4-(3-phenylpropyl)-pyridine (PPP), is immobilized into the trench to allow anion transfer upon oxidation of DDPD (oil) to DDPD (oil). In "mono-potentiostatic mode" quantitative transfer/expulsion of anions into the trench oil phase occurs. However, in "bi-potentiostatic mode" feedback currents dominated by rapid plate-to-plate diffusion normal to the electrode surfaces are observed. Comparison of "normal" diffusion and "lateral" diffusion shows that the rate of diffusion-migration charge transport across the oil film is anion hydrophobicity dependent.

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A gold-gold oil microtrench electrode for liquid-liquid anion transfer voltammetry

Abstract

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Nanogap Electrochemistry and Sensor Technology at the Molecular Limit

MC2-Electron Microscopy (EM)

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A gold-gold oil microtrench electrode for liquid-liquid anion transfer voltammetry

Abstract

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Fingerprint

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Nanogap Electrochemistry and Sensor Technology at the Molecular Limit

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MC2-Electron Microscopy (EM)

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