Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki

Screen-printed carbon electrode (SPCE) has been extensively employed as a matrix for sensing application. However, the SPCE still has a poor electrochemical activity to be used as a sensing electrode due to its lower conductivity and electrochemical properties than gold. Therefore, in this study, su...

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Main Author:	Mohd Zaki, Mohammad Hafizudden
Format:	Thesis
Language:	English
Published:	2023
Subjects:	Electrochemical analysis
Online Access:	https://ir.uitm.edu.my/id/eprint/42191/6/42191.pdf
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id	my-uitm-ir.42191
record_format	uketd_dc
spelling	my-uitm-ir.421912024-01-08T11:55:45Z Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki 2023 Mohd Zaki, Mohammad Hafizudden Electrochemical analysis Carbon nanotubes. Nanoparticles. Nanostructured materials Screen-printed carbon electrode (SPCE) has been extensively employed as a matrix for sensing application. However, the SPCE still has a poor electrochemical activity to be used as a sensing electrode due to its lower conductivity and electrochemical properties than gold. Therefore, in this study, surface modification of SPCE with gold nanostructures coating and their respective electrochemical application as a nonenzymatic sensor for detection of glucose was investigated. Prior to gold nanostructures coating, SPCE was pre-treated by cleaning with H2SO4 followed by coating with a gold underlayer (Au/SPCE) to enhance the adhesion of the nanostructured gold coating to the SPCE surface. Two synthesis strategies were used to produce high surface area of gold coatings where first strategy involved the deposition of nanostructured gold using a hydrogen bubbles dynamic template and the second strategy was through dealloying of gold-copper alloy. The deposition parameters such as deposition potentials, deposition time of gold, the molar ratio of alloy electrolytes and also immersion time of the chemical dealloying were optimized to produce gold-based coatings. The modified SPCEs were characterized for their surface morphology, elemental composition, crystallite structures and surface roughness by FESEM, EDX, XRD and AFM, respectively, and their electrochemical and electrocatalytic properties by CV and EIS. The electrochemical performance of the gold electrode for glucose detection was analyzed by CV and CA in 0.1 M NaOH solution. 2023 Thesis https://ir.uitm.edu.my/id/eprint/42191/ https://ir.uitm.edu.my/id/eprint/42191/6/42191.pdf text en public phd doctoral Universiti Teknologi MARA (UiTM) Faculty of Applied Sciences Mohd, Yusairie
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Mohd, Yusairie
topic	Electrochemical analysis Electrochemical analysis
spellingShingle	Electrochemical analysis Electrochemical analysis Mohd Zaki, Mohammad Hafizudden Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki
description	Screen-printed carbon electrode (SPCE) has been extensively employed as a matrix for sensing application. However, the SPCE still has a poor electrochemical activity to be used as a sensing electrode due to its lower conductivity and electrochemical properties than gold. Therefore, in this study, surface modification of SPCE with gold nanostructures coating and their respective electrochemical application as a nonenzymatic sensor for detection of glucose was investigated. Prior to gold nanostructures coating, SPCE was pre-treated by cleaning with H2SO4 followed by coating with a gold underlayer (Au/SPCE) to enhance the adhesion of the nanostructured gold coating to the SPCE surface. Two synthesis strategies were used to produce high surface area of gold coatings where first strategy involved the deposition of nanostructured gold using a hydrogen bubbles dynamic template and the second strategy was through dealloying of gold-copper alloy. The deposition parameters such as deposition potentials, deposition time of gold, the molar ratio of alloy electrolytes and also immersion time of the chemical dealloying were optimized to produce gold-based coatings. The modified SPCEs were characterized for their surface morphology, elemental composition, crystallite structures and surface roughness by FESEM, EDX, XRD and AFM, respectively, and their electrochemical and electrocatalytic properties by CV and EIS. The electrochemical performance of the gold electrode for glucose detection was analyzed by CV and CA in 0.1 M NaOH solution.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd Zaki, Mohammad Hafizudden
author_facet	Mohd Zaki, Mohammad Hafizudden
author_sort	Mohd Zaki, Mohammad Hafizudden
title	Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki
title_short	Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki
title_full	Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki
title_fullStr	Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki
title_full_unstemmed	Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki
title_sort	surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on au/spce for glucose detection / mohammad hafizudden mohd zaki
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	Faculty of Applied Sciences
publishDate	2023
url	https://ir.uitm.edu.my/id/eprint/42191/6/42191.pdf
_version_	1794191823940354048

Surface properties and electrochemical performance of nanostructured gold coatings electrodeposited on Au/SPCE for glucose detection / Mohammad Hafizudden Mohd Zaki

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