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Fabrication of an all-solid-state ammonium ion– selective electrode by a two-step process using cyclic voltammetry

Benoudjit, Abdelmohsen and Abd-Wahab, Firdaus and Wan Salim, Wan Wardatul Amani (2020) Fabrication of an all-solid-state ammonium ion– selective electrode by a two-step process using cyclic voltammetry. In: 1st International Electronic Conference on Biosensors (IECB 2020), 2nd-17th November 2020, Online.

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Ammonium ions (NH4+) are one of the indicators of water quality; high ammonium concentration [NH4+] in water can cause eutrophication and affect aquatic biota and can cause cell death in the central nervous system of human beings. However, current ion-selective electrodes used for water-quality monitoring are bulky, require frequent calibration owing to membrane fouling, and cannot be integrated into mobile sensor platforms. We fabricated an all-solid-state ion-selective electrode for ammonium ion (NH4+ISE) using a two-step process; first is electropolymerization deposition on the electrode using a solution of 3,4-ethylenedioxythiophene (EDOT), sodium polystyrene sulfonate (NaPSS), and o-phenylenediamine (OPD) resulting in a solid-state transducer on screen-printed carbon electrodes (SPCEs), and the second is electropolymerization of OPD as ion-selective membrane (ISM) on top of the transducer. The electropolymerization deposition of the transducer and the ISM were simply achieved by using cyclic voltammetry (CV) with potential from 0.0 V to 0.8 V and 50 mVs-1 scan rate. The fabricated NH4+ISE can detect [NH4+] as low as 4.8×10-5 M, with a slope of 20 mV/decade (R2>0.99) and a linear range from 4.8×10-5 M to 0.1 M. These preliminary results provide an initial insight into the applicability of the simple two-steps fabrication process of the NH4+ISEs for scaling-up purposes, with the ability for miniaturization and integration to a mobile sensor platform.

Item Type: Conference or Workshop Item (Plenary Papers)
Additional Information: 7116/84243
Uncontrolled Keywords: All-solid-state ion-selective electrode; electropolymerization; ammonium ion; cyclic voltammetry; EDOT
Subjects: T Technology > TD Environmental technology. Sanitary engineering > TD169 Environmental protection
T Technology > TP Chemical technology > TP248.13 Biotechnology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering
Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User: Dr Wan Wardatul Amani Wan Salim
Date Deposited: 11 Nov 2020 09:58
Last Modified: 01 Dec 2020 11:26
URI: http://irep.iium.edu.my/id/eprint/84243

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