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Electrochemical capacitive K+ EMIS chemical sensor based on the dibromoaza[7]helicene as an ionophore for potassium ions detection

AuthorsTounsi, Moncef; Zabala García, Miguel; Bausells, Joan ; Errachid, Abdelhamid
KeywordsCapacitive field-effect chemical sensor
potassium sensitivity
electrochemical impedance spectroscopy
silicon nitride
Issue Date27-Jun-2016
CitationElectroanalysis - Weinheim 28: 2892-2899 (2016)
AbstractA K+-sensitive capacitive electrolyte-membrane-insulator-semiconductor (EMIS) based on a novel dibromoaza[7]helicene ionophore has been developed. An ion-sensitive membrane based on polyvinylchloride (PVC) doped with the ionophore was deposited on the Si3N4/SiO2/Si-p/Cu-Al transducer. The properties of the K+-EMIS chemical sensor were investigated by electrochemical impedance spectroscopy (EIS). All the developed devices upon being tested have shown good sensitivity and linearity responses within the range 10-6 M to 10-1 M of potassium activity, with good selectivity over a wide variety of other cations (Na+, Li+, Cu2+, Ca2+, and Mg2+). To our knowledge, this is the first time that a capacitive field-effect sensor has been fabricated using helicene as a carrier for a K+-detection, combined with the structure Si3N4/SiO2/Si-p/Cu-Al as a transducer.
DescriptionTounsi, Moncef et al.
Appears in Collections:(IMB-CNM) Artículos
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