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

Research output: Contribution to journalArticlepeer-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)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.

Original languageEnglish (US)
Pages (from-to)11-16
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume447
Issue number1-2
DOIs
StatePublished - Apr 30 1998

Keywords

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

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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