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Tailoring the electrochemical and morphological properties of electropolymerized and Dropcast rGO:PSS-PEDOT:PSS transducers for ion-selective sensors

Shohibuddin, Ihda Uswatun Shalihah and Wan Salim, Wan Wardatul Amani (2020) Tailoring the electrochemical and morphological properties of electropolymerized and Dropcast rGO:PSS-PEDOT:PSS transducers for ion-selective sensors. In: The 1st International Electronic Conference on Biosensors (IECB 2020), 02nd-17th November 2020, Online platform.

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Fabrication of ion-selective sensors for continuous measurement in fluids depends on understanding the electrochemical and morphological properties of transducers. Electropolymerized nanomaterials essentially offer stable transducers that can reduce measurement drifts. This study aims to elucidate the electrochemical and morphological characteristics of electropolymerized reduced graphene oxide stabilized in polystyrenesulfonate and poly(3,4-ethylenedioxythiophene): polystyrenesulfonate composites on screen-printed carbon electrodes (rGO:PSS-PEDOT:PSS/SPCEs) using scanning electron microscopy (SEM) and cyclic voltammetry (CV) in 0.1 M ferricyanide (Fe(CN)64/3-). We fabricated the rGO:PSS-PEDOT:PSS/SPCEs by two different techniques: electropolymerization deposition (EPD) and drop-casting (DC). Results revealed smaller peak-to-peak potential separation (ΔEp) of 360 mV for EPD rGO:PSS-PEDOT:PSS/SPCEs, compared to 510 mV for the DC rGO:PSS-PEDOT:PSS/SPCEs. A smaller ΔEp indicates higher reversibility and faster electron-transfer rate at the electrode-analyte interface. SEM results showed EPD rGO:PSS-PEDOT:PSS/SPCEs have the roughest surface among electrodes; homogeneous globular structures with diameter range of 1.4–5.3 μm covered the electrode surface. In terms of electrode integrity in fluids, cracks can be seen on the surface of DC PEDOT:PSS/SPCEs after undergoing CV in 0.1 M Fe(CN)64/3-, whereas rGO:PSS-PEDOT:PSS/SPCEs for both deposition methods maintained their integrity. Globular structures of rGO:PSS-PEDOT:PSS using EPD methods remained after undergoing CV. The results suggest that EPD serves as a potential method to fabricate a stable transducer for ion-selective sensing. This study aims to elucidate performance of nanocomposites via EPD methods, to develop stable ion-selective sensors for physiological and environmental applications.

Item Type: Conference or Workshop Item (Plenary Papers)
Additional Information: 7116/84269
Uncontrolled Keywords: electropolymerization; drop-cast; reduced graphene oxide; PEDOT:PSS; rGO:PSS; all-solid-state ion-selective sensors
Subjects: T Technology > TP Chemical technology > TP248.13 Biotechnology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Biotechnology Engineering
Kulliyyah of Engineering
Depositing User: Dr Wan Wardatul Amani Wan Salim
Date Deposited: 04 Nov 2020 09:54
Last Modified: 04 Nov 2020 09:54
URI: http://irep.iium.edu.my/id/eprint/84269

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