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Determination of low levels of cadmium ions by the under potential deposition on a self assembled monolayer on gold electrode
Analytica Chimica Acta (2010)
  • Tomer Noyhouzer, McGill University
  • Daniel Mandler, Hebrew University of Jerusalem
Abstract

The electrochemical determination of low levels of Cd using a self-assembled monolayer (SAM) modified Au electrode is reported. Determination was based on the stripping of Cd, which was deposited by under potential deposition (UPD). A series of short alkanethiol SAMs bearing different end groups, i.e., sulfonate, carboxylate and ammonium, were examined. Lowest level of detection (ca. 50 ngL(-1)) was achieved with a 3-mercaptopropionic acid (MPA) monolayer using subtractive anodic square wave voltammetry (SASV). Additional surface methods, namely, reductive desorption and X-ray photoelectron spectroscopy, were applied to determine the interfacial structure of the electrodeposited Cd on the modified electrodes. We conclude that the deposited Cd forms a monoatomic layer, which bridges between the gold surface and the alkanethiol monolayer associating with both the gold and the sulfur atoms.

Keywords
  • Cadmium; Under potential deposition; Self-assembled monolayer; Subtractive anodic square wave voltammetry
Publication Date
October, 2010
Citation Information
Tomer Noyhouzer and Daniel Mandler. "Determination of low levels of cadmium ions by the under potential deposition on a self assembled monolayer on gold electrode" Analytica Chimica Acta Vol. 684 Iss. 1-2 (2010)
Available at: http://works.bepress.com/tomer_noyhouzer/1/