Characterization of a self-assembled monolayer based on a calix[4]crown-5 derivate: fabrication of a chemical sensor sensitive to calcium.

Isabel A Marques de Oliveira, Francis Vocanson, Jean-Pierre Uttaro, Zouhair Asfari, Christopher A Mills, Josep Samitier, Abdelhamid Errachid

Laboratory of Nanobioengineering, Institut de Bioenginyeria de Catalunya, C/Josep Samitier 1-5, 08028 Barcelona, Spain.

Journal of nanoscience and nanotechnology 2010 Jan

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The synthesis and self-assembled monolayer (SAM) formation of a calix[4]crown-5 derivative are reported. Several techniques, including electrochemistry, atomic force microscopy (AFM), Time-of-flight secondary ion mass spectrometry (ToF-SIMS) and contact angle measurements have been applied to characterise the monolayer film designed for chemical sensor applications. The recognition properties of this SAM for metal cations has been investigated using impedance spectroscopy (IS) showing an electrochemical response proportional to calcium ion concentration in the range from 10(-7) M to 10(-2) M. This response is related to microscopic changes at the gold surface induced by selective binding by the immobilised calixarene.

Citation

Isabel A Marques de Oliveira, Francis Vocanson, Jean-Pierre Uttaro, Zouhair Asfari, Christopher A Mills, Josep Samitier, Abdelhamid Errachid. Characterization of a self-assembled monolayer based on a calix[4]crown-5 derivate: fabrication of a chemical sensor sensitive to calcium. Journal of nanoscience and nanotechnology. 2010 Jan;10(1):413-20