Cyclic voltammetry and electrochemical impedance spectroscopy of partially reduced graphene oxide - PEDOT:PSS transducer for biochemical sensing

Ismail, Nur Alya Batrisya and Abd. Wahab, Mohd. Firdaus and Wan Salim, Wan Wardatul Amani (2019) Cyclic voltammetry and electrochemical impedance spectroscopy of partially reduced graphene oxide - PEDOT:PSS transducer for biochemical sensing. In: 2018 IEEE EMBS Conference on Biomedical Engineering and Sciences )IECBES 2018), 3rd-6th December 2018, Kuching, Sarawak.

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Abstract

Electron-transfer kinetics and impedance at the electrode-solution interface affect biosensor performance. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy(EIS) are used to understand the reversibility of electron transfer and impedance at the electrode-solution interface, respectively. Effective surface areas calculated based on the Randles-Sevcik equation for a bare screen-printed carbon electrode (SPCE), a graphene oxide (GO)-poly (3,4-ethylenedioxythiophene):polystyrenesulfonic acid (PEDOT:PSS)–modified electrode (GO-PEDOT:PSS/SPCE), a partially reduced graphene oxide-PEDOT:PSS–modified electrode (prGO-PEDOT:PSS/SPCE), and glucose oxidase (GOx) crosslinked with glutaraldehyde on partially reduced graphene oxide-PEDOT:PSS–modified electrodes (GOx/prGOPEDOT:PSS/SPCE) are 0.0717 mm2, 0.0794 mm2, 0.219 mm2, and 0.160 mm2, respectively. Nyquist plots from EIS show charge transfer resistance (Rct) of 430 μΩ, 148.2 Ω, 200.7 Ω, and 209.6 Ω, respectively, for the same electrodes. The high effective surface area and the Rct of prGO-PEDOT:PSS/SPCE indicate that the prGO-PEDOT:PSS composite is suitable as a transducer layer for glucose biosensing.

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	5236/69484
Uncontrolled Keywords:	cyclic voltammetry, electrical impedance spectroscopy, PEDOT:PSS, reduced graphene oxide, glucose oxidase, biosensor
Subjects:	Q Science > Q Science (General) T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) > TA164 Bioengineering
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:	31 Jan 2019 12:02
Last Modified:	13 Jun 2019 16:34
URI:	http://irep.iium.edu.my/id/eprint/69484

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