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Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection

In the present study, indium tin oxide (ITO) was used as a transparent working electrode for the development of an electrochemical sensor for the detection of mercury (II) ions (Hg2+). The electrode was modified by direct electrodeposition of polyaniline (PANI), multiwalled carbon nanotubes (MWCNTs)...

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Main Authors: Noor Aini Bohari, Shafiquzzaman Siddiquee, Suryani Saallah, Mailin Misson, Sazmal Effendi Arshad
Format: Article
Language:English
Published: MDPI 2020
Subjects:
Q1-295 General
QD146-197 Inorganic chemistry
RL1-803 Dermatology
Online Access:https://eprints.ums.edu.my/id/eprint/42496/1/FULL%20TEXT.pdf
https://eprints.ums.edu.my/id/eprint/42496/
http://dx.doi.org/10.3390/s20226502
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spelling my.ums.eprints.424962024-12-31T03:18:50Z https://eprints.ums.edu.my/id/eprint/42496/ Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection Noor Aini Bohari Shafiquzzaman Siddiquee Suryani Saallah Mailin Misson Sazmal Effendi Arshad Q1-295 General QD146-197 Inorganic chemistry RL1-803 Dermatology In the present study, indium tin oxide (ITO) was used as a transparent working electrode for the development of an electrochemical sensor for the detection of mercury (II) ions (Hg2+). The electrode was modified by direct electrodeposition of polyaniline (PANI), multiwalled carbon nanotubes (MWCNTs) and gold nanoparticles (AuNPs) followed by optimization of the analyte and operating conditions, aiming to improve the selectivity, sensitivity and reliability of the electrode for mercury detection. Successful immobilization of the PANI and nanomaterials (MWCNTs and AuNPs) on the ITO electrode was confirmed by Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDX) and Fourier Transform Infrared Spectroscopy (FTIR) analyses. The optimum conditions for mercury detection using the modified ITO electrode were pH 7.0 of Tris-HCl buffer (50 mM) in the presence of 1 mM methylene blue (MB) as a redox indicator, a scan rate of 0.10 V·s −1 and a 70 s interaction time. The electrochemical behavior of the modified electrode under the optimized conditions indicated a high reproducibility and high sensitivity of mercury detection. It is therefore suggested that the PANI/MWCNT/AuNP-modified ITO electrode could be a promising material for the development of on-site mercury detection tools for applications in fields such as diagnostics, the environment, safety and security controls or other industries. MDPI 2020 Article NonPeerReviewed text en https://eprints.ums.edu.my/id/eprint/42496/1/FULL%20TEXT.pdf Noor Aini Bohari and Shafiquzzaman Siddiquee and Suryani Saallah and Mailin Misson and Sazmal Effendi Arshad (2020) Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection. Sensors, 20. pp. 1-17. http://dx.doi.org/10.3390/s20226502
institution Universiti Malaysia Sabah
building UMS Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sabah
content_source UMS Institutional Repository
url_provider http://eprints.ums.edu.my/
language English
topic Q1-295 General
QD146-197 Inorganic chemistry
RL1-803 Dermatology
spellingShingle Q1-295 General
QD146-197 Inorganic chemistry
RL1-803 Dermatology
Noor Aini Bohari
Shafiquzzaman Siddiquee
Suryani Saallah
Mailin Misson
Sazmal Effendi Arshad
Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection
description In the present study, indium tin oxide (ITO) was used as a transparent working electrode for the development of an electrochemical sensor for the detection of mercury (II) ions (Hg2+). The electrode was modified by direct electrodeposition of polyaniline (PANI), multiwalled carbon nanotubes (MWCNTs) and gold nanoparticles (AuNPs) followed by optimization of the analyte and operating conditions, aiming to improve the selectivity, sensitivity and reliability of the electrode for mercury detection. Successful immobilization of the PANI and nanomaterials (MWCNTs and AuNPs) on the ITO electrode was confirmed by Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDX) and Fourier Transform Infrared Spectroscopy (FTIR) analyses. The optimum conditions for mercury detection using the modified ITO electrode were pH 7.0 of Tris-HCl buffer (50 mM) in the presence of 1 mM methylene blue (MB) as a redox indicator, a scan rate of 0.10 V·s −1 and a 70 s interaction time. The electrochemical behavior of the modified electrode under the optimized conditions indicated a high reproducibility and high sensitivity of mercury detection. It is therefore suggested that the PANI/MWCNT/AuNP-modified ITO electrode could be a promising material for the development of on-site mercury detection tools for applications in fields such as diagnostics, the environment, safety and security controls or other industries.
format Article
author Noor Aini Bohari
Shafiquzzaman Siddiquee
Suryani Saallah
Mailin Misson
Sazmal Effendi Arshad
author_facet Noor Aini Bohari
Shafiquzzaman Siddiquee
Suryani Saallah
Mailin Misson
Sazmal Effendi Arshad
author_sort Noor Aini Bohari
title Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection
title_short Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection
title_full Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection
title_fullStr Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection
title_full_unstemmed Optimization and analytical behavior of electrochemical sensors based on the modification of Indium Tin Oxide (ITO) using PANI/MWCNTs/AuNPs for mercury detection
title_sort optimization and analytical behavior of electrochemical sensors based on the modification of indium tin oxide (ito) using pani/mwcnts/aunps for mercury detection
publisher MDPI
publishDate 2020
url https://eprints.ums.edu.my/id/eprint/42496/1/FULL%20TEXT.pdf
https://eprints.ums.edu.my/id/eprint/42496/
http://dx.doi.org/10.3390/s20226502
_version_ 1821003225234407424
score 13.23648

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