Impedance analysis of self-assembled naphthalene disulfide monolayer on gold using external redox probes

Krisanu Bandyopadhyay; K. Vijayamohanan; G. S. Shekhawat; Ram P. Gupta

doi:10.1016/S0022-0728(97)00491-9

Impedance analysis of self-assembled naphthalene disulfide monolayer on gold using external redox probes

Krisanu Bandyopadhyay, K. Vijayamohanan^*, G. S. Shekhawat, Ram P. Gupta

^*Corresponding author for this work

Materials Science and Engineering

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

39 Scopus citations

Abstract

A self-assembled monolayer (SAM) of naphthalene disulfide (NDS) has been formed on a polycrystalline gold surface. Techniques like cyclic voltammetry and impedance measurement with an external redox probe along with scanning tunnelling microscopy (STM) are used to investigate the monolayer structure and ion permeation through it. Impedance analysis shows that the rate constant of a fast redox couple like Fe(CN)₆^4-/3- has decreased from 2.3 × 10^-2 to 9.4 × 10^-4 cm s^-1 due to the barrier provided by the monolayer. The STM image clearly shows the presence of defects (as pinholes) on the monolayer surface in agreement with the residual current observed in the voltammograms.

Original language	English (US)
Pages (from-to)	11-16
Number of pages	6
Journal	Journal of Electroanalytical Chemistry
Volume	447
Issue number	1-2
DOIs	https://doi.org/10.1016/S0022-0728(97)00491-9
State	Published - Apr 30 1998

Funding

K.B. thanks the University Grants Commission, New Delhi, Government of India, for a Senior research fellowship.

Keywords

External redox probes
Gold
Impedance analysis
Naphthalene disulfide
Self-assembled monolayer

ASJC Scopus subject areas

Analytical Chemistry
General Chemical Engineering
Electrochemistry

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10.1016/S0022-0728(97)00491-9

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title = "Impedance analysis of self-assembled naphthalene disulfide monolayer on gold using external redox probes",

abstract = "A self-assembled monolayer (SAM) of naphthalene disulfide (NDS) has been formed on a polycrystalline gold surface. Techniques like cyclic voltammetry and impedance measurement with an external redox probe along with scanning tunnelling microscopy (STM) are used to investigate the monolayer structure and ion permeation through it. Impedance analysis shows that the rate constant of a fast redox couple like Fe(CN)64-/3- has decreased from 2.3 × 10-2 to 9.4 × 10-4 cm s-1 due to the barrier provided by the monolayer. The STM image clearly shows the presence of defects (as pinholes) on the monolayer surface in agreement with the residual current observed in the voltammograms.",

keywords = "External redox probes, Gold, Impedance analysis, Naphthalene disulfide, Self-assembled monolayer",

author = "Krisanu Bandyopadhyay and K. Vijayamohanan and Shekhawat, {G. S.} and Gupta, {Ram P.}",

note = "Funding Information: K.B. thanks the University Grants Commission, New Delhi, Government of India, for a Senior research fellowship. ",

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T1 - Impedance analysis of self-assembled naphthalene disulfide monolayer on gold using external redox probes

AU - Bandyopadhyay, Krisanu

AU - Vijayamohanan, K.

AU - Shekhawat, G. S.

AU - Gupta, Ram P.

N1 - Funding Information: K.B. thanks the University Grants Commission, New Delhi, Government of India, for a Senior research fellowship.

PY - 1998/4/30

Y1 - 1998/4/30

N2 - A self-assembled monolayer (SAM) of naphthalene disulfide (NDS) has been formed on a polycrystalline gold surface. Techniques like cyclic voltammetry and impedance measurement with an external redox probe along with scanning tunnelling microscopy (STM) are used to investigate the monolayer structure and ion permeation through it. Impedance analysis shows that the rate constant of a fast redox couple like Fe(CN)64-/3- has decreased from 2.3 × 10-2 to 9.4 × 10-4 cm s-1 due to the barrier provided by the monolayer. The STM image clearly shows the presence of defects (as pinholes) on the monolayer surface in agreement with the residual current observed in the voltammograms.

AB - A self-assembled monolayer (SAM) of naphthalene disulfide (NDS) has been formed on a polycrystalline gold surface. Techniques like cyclic voltammetry and impedance measurement with an external redox probe along with scanning tunnelling microscopy (STM) are used to investigate the monolayer structure and ion permeation through it. Impedance analysis shows that the rate constant of a fast redox couple like Fe(CN)64-/3- has decreased from 2.3 × 10-2 to 9.4 × 10-4 cm s-1 due to the barrier provided by the monolayer. The STM image clearly shows the presence of defects (as pinholes) on the monolayer surface in agreement with the residual current observed in the voltammograms.

KW - External redox probes

KW - Gold

KW - Impedance analysis

KW - Naphthalene disulfide

KW - Self-assembled monolayer

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JF - Journal of Electroanalytical Chemistry

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ER -

Impedance analysis of self-assembled naphthalene disulfide monolayer on gold using external redox probes

Abstract

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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