A novel EIS field effect structures coated with TESUD-PPy-PVC-dibromoaza[7]helicene matrix for potassium ions detection

Abstract : In this work, we describe the development of new Aza[7]helicene-containing PVC-based membranes for the K+ ions quantification. Here, silicon nitride-based structures (Si-p/SiO2/Si3N4) were developed and the surface was activated, functionalized with an aldehyde–silane (11-(Triethoxysilyl)undecanal (TESUD)), functionalized with polypyrrole (PPy), and coated with the polyvinylchloride (PVC)-membrane containing the Aza[7]helicene as ionophore. All stages of functionalization process have been thoroughly studied by contact angle measurements (CAMs) and atomic force microscopy (AFM). The developed ion-selective electrode (ISE) was then applied using electrochemical impedance spectroscopy (EIS) for the detection of potassium ions. A linear range was observed between 1.0 × 10− 8 M to 1.0 × 10− 3 M and a detection limit of 1.0 × 10− 8 M was observed. The EIS results have showed a good sensitivity to potassium ion using this novel technique. The target helicene exhibited good solubility and excellent thermal stability with a high decomposition temperature (Td > 300 °C) and it indicates that helicene may be a promising material as ionophore for ion-selective electrodes (ISEs) elaboration.
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https://hal.archives-ouvertes.fr/hal-01275308
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Submitted on : Wednesday, February 17, 2016 - 11:48:08 AM
Last modification on : Wednesday, April 3, 2019 - 1:30:53 AM

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Moncef Tounsi, Mourad Ben Braiek, Houcine Barhoumi, Abdoullatif Baraket, Michael Lee, et al.. A novel EIS field effect structures coated with TESUD-PPy-PVC-dibromoaza[7]helicene matrix for potassium ions detection. Materials Sciences and Engineering: C, Elsevier, 2016, 61, pp.608-615. 〈10.1016/j.msec.2015.12.069〉. 〈hal-01275308〉

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