Blocking behavior of self-assembled monolayers on gold electrodes |
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Authors: | Hong Shen James E Mark Carl J Seliskar Harry B Mark Jr William R Heineman |
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Institution: | (1) Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, OH 45221-0172, USA, US |
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Abstract: | Self-assembled monolayers (SAMs) with metal electrodes, especially thiols on gold, are the subject of this investigation
because of the unique properties of SAM-modified surfaces. Normal alkanethiols are used to modify the surface of a conventional
gold electrode to block certain ions such as Pb(II) and Cu(II) from the surface of the electrode. Normal alkanethiols are
also used to study the SAM-gold interfacial adsorption-desorption behavior of the self-assembled monolayer. The effects of
varying chain length of SAMs, varying concentration of the alkanethiol solutions, immersion time of the pure gold electrode
in the SAM solution, and the stability of a SAM-modified gold electrode in fresh chloroform are investigated using the oxidation-reduction
peaks of gold. Conditions that optimize the surface coverage and the uniformity of the SAMs have been determined. Normal alkanethiols
proved to be a good insulator on the electrode surface.
Received: 16 January 1997 / Accepted: 4 March 1997 |
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Keywords: | Self-assembled monolayers Thiols Gold Electrode Adsorption |
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