Cation sensing by patterned self-assembled monolayers on gold


Flink, Simon and Schönherr, Holger and Vancso, G. Julius and Geurts, Frank A.J. and Leerdam, Kees G.C. and Veggel, Frank C.J.M. van and Reinhoudt, David N. (2000) Cation sensing by patterned self-assembled monolayers on gold. Journal of the Chemical Society. Perkin transactions II, 2000 (10). pp. 2141-2146. ISSN 0300-9580

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Abstract:X-Ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) have been used to study the interactions between self-assembled monolayers (SAMs) of crown ether adsorbates and metal ions. Both analytical techniques confirmed the selectivities of the 12-crown-4 and 15-crown-5 SAMs that had previously been determined by electrochemical impedance spectroscopy. AFM has also been used to characterize microcontact-printed crown ether monolayers. The electrochemical patterning of monolayers on gold allowed the design of a dual sensor for the electrochemical detection of cations. However, due to cross-contamination of both monolayers during the patterning process a significant selectivity reduction of the layers was observed. Nevertheless, the remaining Na+ selectivity of the 12-crown-4 SAM and the K+ selectivity of the 15-crown-5 SAM allowed the unambiguous discrimination between both metal ions.
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Copyright:© Royal Society of Chemistry 2000
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Metis ID: 106320