Bandyopadhyay, Krisanu ; Vijayamohanan, K. ; Shekhawat, G. S. ; Gupta, Ram P. (1998) Impedance analysis of self-assembled naphthalene disulfide monolayer on gold using external redox probes Journal of Electroanalytical Chemistry, 447 (1-2). pp. 11-16. ISSN 0022-0728
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S0022-0728(97)00491-9
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Impedance Analysis; Naphthalene Disulfide; Gold; External Redox Probes; Self-Assembled Monolayer |
| ID Code: | 68869 |
| Deposited On: | 07 Nov 2011 05:06 |
| Last Modified: | 07 Nov 2011 05:06 |
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