Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy

In this study, a three-dimensional structure of nanoporous gold (NPG) was made by selectively corroding copper (Cu) from gold-copper (Au-Cu) alloys using a two-step electrochemical method. Given its large surface area and interconnected porous network, nanoporous gold is a suitable material for the...

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Published in:International Journal of Nanoelectronics and Materials
Main Author: Azman N.A.; Mohd Y.; Zain Z.M.; Chin L.Y.
Format: Article
Language:English
Published: Universiti Malaysia Perlis 2023
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85172920208&partnerID=40&md5=3d197461bbdffd59732d466894e02eaf
id 2-s2.0-85172920208
spelling 2-s2.0-85172920208
Azman N.A.; Mohd Y.; Zain Z.M.; Chin L.Y.
Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy
2023
International Journal of Nanoelectronics and Materials
16
4

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85172920208&partnerID=40&md5=3d197461bbdffd59732d466894e02eaf
In this study, a three-dimensional structure of nanoporous gold (NPG) was made by selectively corroding copper (Cu) from gold-copper (Au-Cu) alloys using a two-step electrochemical method. Given its large surface area and interconnected porous network, nanoporous gold is a suitable material for the advancement of electrochemical sensors. The screen-printed carbon electrode (SPCE) modified with nanoporous gold (NPG/SPCE) was fabricated by electrodepositing a gold-copper alloy from gold ion (Au3+) and copper ion (Cu2+) solution via cyclic voltammetry (CV) by scanning from-0.3 V to-0.8 V for 80 cycles. The copper is then removed via a dealloying process in 3M HNO3 using the cyclic voltammogram (CV) method by scanning potential from 0 V to +1.0 V for 100 cycles at 100 mV/s. The morphology, elemental composition, and electrochemical active surface area (ECSA) of NPG/SPCE electrodes were characterized using FESEM, EDX, and CV analysis, respectively. The electrochemical performance of the NPG/SPCE was compared with bare SPCE in a 10 mM potassium ferrocyanide (K4FeCN6) solution using cyclic voltammetry. The morphological study using FESEM revealed that the NPG/SPCE had an average pore diameter of 53 nm. The quantification of elements using EDX shows that 84 % of the copper in the electrodeposited gold-copper alloy electrode was successfully removed by the dealloying process. The higher number of cycles during the dealloying process led to producing NPG with higher ECSA electrodes. The ECSA of NPG/SPCE is 12 times greater than that of bare or unmodified SPCE in an equivalent geometrical area. NPG/SPCE has a much better electron transfer surface than bare SPCE due to its high surface area and gold surface properties, making it a potential sensing material for biosensing applications. © 2023, Universiti Malaysia Perlis. All rights reserved.
Universiti Malaysia Perlis
19855761
English
Article

author Azman N.A.; Mohd Y.; Zain Z.M.; Chin L.Y.
spellingShingle Azman N.A.; Mohd Y.; Zain Z.M.; Chin L.Y.
Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy
author_facet Azman N.A.; Mohd Y.; Zain Z.M.; Chin L.Y.
author_sort Azman N.A.; Mohd Y.; Zain Z.M.; Chin L.Y.
title Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy
title_short Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy
title_full Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy
title_fullStr Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy
title_full_unstemmed Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy
title_sort Modification of a screen-printed carbon electrode with nanoporous gold by electrodeposition and dealloying of a gold-copper alloy
publishDate 2023
container_title International Journal of Nanoelectronics and Materials
container_volume 16
container_issue 4
doi_str_mv
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85172920208&partnerID=40&md5=3d197461bbdffd59732d466894e02eaf
description In this study, a three-dimensional structure of nanoporous gold (NPG) was made by selectively corroding copper (Cu) from gold-copper (Au-Cu) alloys using a two-step electrochemical method. Given its large surface area and interconnected porous network, nanoporous gold is a suitable material for the advancement of electrochemical sensors. The screen-printed carbon electrode (SPCE) modified with nanoporous gold (NPG/SPCE) was fabricated by electrodepositing a gold-copper alloy from gold ion (Au3+) and copper ion (Cu2+) solution via cyclic voltammetry (CV) by scanning from-0.3 V to-0.8 V for 80 cycles. The copper is then removed via a dealloying process in 3M HNO3 using the cyclic voltammogram (CV) method by scanning potential from 0 V to +1.0 V for 100 cycles at 100 mV/s. The morphology, elemental composition, and electrochemical active surface area (ECSA) of NPG/SPCE electrodes were characterized using FESEM, EDX, and CV analysis, respectively. The electrochemical performance of the NPG/SPCE was compared with bare SPCE in a 10 mM potassium ferrocyanide (K4FeCN6) solution using cyclic voltammetry. The morphological study using FESEM revealed that the NPG/SPCE had an average pore diameter of 53 nm. The quantification of elements using EDX shows that 84 % of the copper in the electrodeposited gold-copper alloy electrode was successfully removed by the dealloying process. The higher number of cycles during the dealloying process led to producing NPG with higher ECSA electrodes. The ECSA of NPG/SPCE is 12 times greater than that of bare or unmodified SPCE in an equivalent geometrical area. NPG/SPCE has a much better electron transfer surface than bare SPCE due to its high surface area and gold surface properties, making it a potential sensing material for biosensing applications. © 2023, Universiti Malaysia Perlis. All rights reserved.
publisher Universiti Malaysia Perlis
issn 19855761
language English
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