Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.

A simple procedure was developed to prepare a glassy carbon electrode (GCE) modified with single-walled carbon nanotube/zinc oxide (SWCNT/ZnO). The carbon nanotube/zinc oxide composites were immobilized on the GCE by mechanical attachment. The electrode surface was gently rubbed on a filter paper su...

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Main Authors:	Koh, Sing Ngai, Tan, Wee Tee, Zainal, Zulkarnain, Mohd Zawawi, Ruzniza, Zidan, Mohammed
Format:	Article
Language:	English English
Published:	Electrochemical Science Group 2013
Online Access:	http://psasir.upm.edu.my/id/eprint/30030/ http://psasir.upm.edu.my/id/eprint/30030/1/Voltammetry%20detection%20of%20ascorbic%20acid%20at%20glassy%20carbon%20electrode%20modified%20by%20single.pdf

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author	Koh, Sing Ngai Tan, Wee Tee Zainal, Zulkarnain Mohd Zawawi, Ruzniza Zidan, Mohammed
author_facet	Koh, Sing Ngai Tan, Wee Tee Zainal, Zulkarnain Mohd Zawawi, Ruzniza Zidan, Mohammed
author_sort	Koh, Sing Ngai
building	UPM Institutional Repository
collection	Online Access
description	A simple procedure was developed to prepare a glassy carbon electrode (GCE) modified with single-walled carbon nanotube/zinc oxide (SWCNT/ZnO). The carbon nanotube/zinc oxide composites were immobilized on the GCE by mechanical attachment. The electrode surface was gently rubbed on a filter paper supporting the SWCNT/ZnO composites. Cyclic voltammetry study of the modified electrode indicated that the oxidation potential shifted towards a lower potential by approximately 240 mV and the peak current was enhanced by 2.0 fold in comparison to the bare GCE. The resulting modified electrode also indicated the absence of a well-defined redox couple implying that the reaction is irreversible. The electrochemical behaviour was further described by characterization studies of scan rate, concentration of ascorbic acid, pH and temperature. The stability of the modified electrode was evaluated by potential cycling study. Such attractive results from the SWCNT/ZnO-modified electrodes suggest a promising ascorbic acid sensor.
first_indexed	2025-11-15T09:04:42Z
format	Article
id	upm-30030
institution	Universiti Putra Malaysia
institution_category	Local University
language	English English
last_indexed	2025-11-15T09:04:42Z
publishDate	2013
publisher	Electrochemical Science Group
recordtype	eprints
repository_type	Digital Repository
spelling	upm-300302015-09-18T01:06:40Z http://psasir.upm.edu.my/id/eprint/30030/ Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide. Koh, Sing Ngai Tan, Wee Tee Zainal, Zulkarnain Mohd Zawawi, Ruzniza Zidan, Mohammed A simple procedure was developed to prepare a glassy carbon electrode (GCE) modified with single-walled carbon nanotube/zinc oxide (SWCNT/ZnO). The carbon nanotube/zinc oxide composites were immobilized on the GCE by mechanical attachment. The electrode surface was gently rubbed on a filter paper supporting the SWCNT/ZnO composites. Cyclic voltammetry study of the modified electrode indicated that the oxidation potential shifted towards a lower potential by approximately 240 mV and the peak current was enhanced by 2.0 fold in comparison to the bare GCE. The resulting modified electrode also indicated the absence of a well-defined redox couple implying that the reaction is irreversible. The electrochemical behaviour was further described by characterization studies of scan rate, concentration of ascorbic acid, pH and temperature. The stability of the modified electrode was evaluated by potential cycling study. Such attractive results from the SWCNT/ZnO-modified electrodes suggest a promising ascorbic acid sensor. Electrochemical Science Group 2013-08 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/30030/1/Voltammetry%20detection%20of%20ascorbic%20acid%20at%20glassy%20carbon%20electrode%20modified%20by%20single.pdf Koh, Sing Ngai and Tan, Wee Tee and Zainal, Zulkarnain and Mohd Zawawi, Ruzniza and Zidan, Mohammed (2013) Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide. International Journal of Electrochemical Science, 8 (8). pp. 10557-10567. ISSN 1452-3981 http://www.electrochemsci.org/list13.htm#issue8 English
spellingShingle	Koh, Sing Ngai Tan, Wee Tee Zainal, Zulkarnain Mohd Zawawi, Ruzniza Zidan, Mohammed Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.
title	Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.
title_full	Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.
title_fullStr	Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.
title_full_unstemmed	Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.
title_short	Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.
title_sort	voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.
url	http://psasir.upm.edu.my/id/eprint/30030/ http://psasir.upm.edu.my/id/eprint/30030/ http://psasir.upm.edu.my/id/eprint/30030/1/Voltammetry%20detection%20of%20ascorbic%20acid%20at%20glassy%20carbon%20electrode%20modified%20by%20single.pdf

Voltammetry detection of ascorbic acid at glassy carbon electrode modified by single-walled carbon nanotube/zinc oxide.

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