Fabrication of organosilane-modified electrodes for metal ion detection at the molecular level |
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Authors: | Kim Younghun Yi Jongheop |
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Institution: | Department of Chemical Engineering, Kwangwoon University, Wolgye, Nowon, Seoul 139-701, Korea. korea1@kw.ac.kr |
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Abstract: | Organosilane-modified (island-type) electrodes of 5 and 10 microm 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 microm-sized electrode. |
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