Web Release Date: October 31,
Fabrication of Organosilane-Modified Electrodes for Metal Ion Detection at the Molecular Level
and
Department of Chemical Engineering, Kwangwoon University, Wolgye, Nowon, Seoul 139-701 and School of Chemical and Biological Engineering, Seoul National University, Shillim, Kwanak, Seoul 151-742, Korea
Received March 25, 2006
In Final Form: October 8, 2006
Abstract:
Organosilane-modified (island-type) electrodes of 5 and 10 
m were fabricated and used to detect trace amounts
of metal ions using atomic force microscopy. The smaller electrode had a lower limit of detection due to the enhancement
in electron tunneling through metal ions that are adsorbed between the conductive-tip (mobile) and the surface (fixed)
electrode. To simulate the detection of metal ions at concentrations below 10-3 mM, a sectional adsorption mechanism
is proposed, which satisfactorily explains the adsorption of Cu(II) and Hg(II) to the amine and thiol moieties of the
5-m-sized electrode.
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