title: Characterization of a self-assembled monolayer based on a calix[4]crown-5 derivate: fabrication of a chemical sensor sensitive to calcium.
abstract: 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.
authors.affiliation: Laboratory of Nanobioengineering, Institut de Bioenginyeria de Catalunya, C/Josep Samitier 1-5, 08028 Barcelona, Spain.
authors.forename: Isabel A
authors.initials: IA
authors.lastname: Marques de Oliveira
authors.forename: Francis
authors.initials: F
authors.lastname: Vocanson
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Uttaro
authors.forename: Zouhair
authors.initials: Z
authors.lastname: Asfari
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Mills
authors.forename: Josep
authors.initials: J
authors.lastname: Samitier
authors.forename: Abdelhamid
authors.initials: A
authors.lastname: Errachid
mesh_terms: D002118:Calcium / Q000032:analysis*; D047250:Calixarenes / Q000737:chemistry*; D043844:Crown Ethers / Q000737:chemistry*; D017097:Electric Impedance; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*
chemical_list: D043844:Crown Ethers; C520512:calix(4)crown-5; D047250:Calixarenes; D002118:Calcium