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An impedimetric sensor based on a gold electrode functionalized with a thiol self-assembled monolayer modified by terpyridine ligands for the detection of free gadolinium ions

Abstract : An impedimetric method of detection of gadolinium(III) free species has been developed using gold electrodes functionalized by terpyridine ligands. Two chemical attachment processes, on an acidic thiol and on an aminothiol, were designed and the sensitized surfaces were then characterized by chemical analyses, physicochemical and electrochemical methods. The detection of Gd3+ was investigated by impedance spectroscopy. A linear calibration curve was obtained from the variation of the polarization resistance versus pGd(3+) in the range 10(-8)M to 10(-3) M. The impedimetric sensor presented a shelf life of more than six months. Moreover, Gd3+ detection in spiked diluted real urine samples was satisfactorily performed.
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https://hal.archives-ouvertes.fr/hal-01119623
Contributor : Agnès Bussy <>
Submitted on : Monday, February 23, 2015 - 3:57:03 PM
Last modification on : Friday, April 17, 2020 - 5:34:01 PM

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Wahid Ben Mefteh, Hassen Touzi, François Bessueille, Yves Chevalier, Rafik Kalfat, et al.. An impedimetric sensor based on a gold electrode functionalized with a thiol self-assembled monolayer modified by terpyridine ligands for the detection of free gadolinium ions. Electroanalysis, Wiley-VCH Verlag, 2015, 27 (1), pp.84-92. ⟨10.1002/elan.201400373⟩. ⟨hal-01119623⟩

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