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Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode

The development of in situ chloroform detection is crucial due to the high risk of carcinogenic effects associated with chloroform exposure. In this study, an electrochemical-based chloroform sensor was fabricated using undoped ZnO nanorods on indium tin oxide (ZnONRs/ITO) electrode to detect chloro...

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Main Authors: Haslinda Abdul Hamid,, Panapan Kunakornwattana,, Norain Isa,, Khairunisak Abdul Razak,
Format: Article
Language:English
Published: Universiti Kebangsaan Malaysia 2023
Online Access:http://journalarticle.ukm.my/22067/1/SE%2011.pdf
http://journalarticle.ukm.my/22067/
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spelling my-ukm.journal.220672023-08-08T08:25:43Z http://journalarticle.ukm.my/22067/ Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode Haslinda Abdul Hamid, Panapan Kunakornwattana, Norain Isa, Khairunisak Abdul Razak, The development of in situ chloroform detection is crucial due to the high risk of carcinogenic effects associated with chloroform exposure. In this study, an electrochemical-based chloroform sensor was fabricated using undoped ZnO nanorods on indium tin oxide (ZnONRs/ITO) electrode to detect chloroform in aqueous-phase samples. Based on the results, the FESEM imaging showed that the ZnONRs exhibited an evenly distributed circular structure with a diameter of 62-90 nm, while the EDX and XRD findings confirmed the presence of Zn and O elements deposited on the electrode surface. Furthermore, the phosphate buffer solution (PBS) solution significantly affected the performance of the modified electrode with an optimal concentration and pH of 0.1 M and pH 7. The results also highlighted the vital function of the modified ZnONRs/ITO electrode as an efficient electron mediator and its catalytic potential to induce chloroform oxidation. Most importantly, the modified ZnONRs/ITO electrode was able to detect the presence of chloroform in real seawater samples, where the repeatability and reproducibility tests achieved a Relative Standard Deviation (RSD) of 1.41% and 2.61%, respectively, indicating the exceptional performance of the modified electrode. Moreover, the modified ZnONRs/ITO electrode recorded a low limit of detection and high sensitivity of 1.50 μM and 2.11 μA/cm2·mM, respectively, within a 0.010-10 mM linear dynamic range. In conclusion, the current-voltage (I-V) method proved the reliable, satisfactory, and effective fabrication of the modified ZnONRs/ITO electrode for chloroform sensing in aqueous-phase samples, including in real seawater samples. Universiti Kebangsaan Malaysia 2023 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/22067/1/SE%2011.pdf Haslinda Abdul Hamid, and Panapan Kunakornwattana, and Norain Isa, and Khairunisak Abdul Razak, (2023) Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode. Sains Malaysiana, 52 (4). pp. 1173-1188. ISSN 0126-6039 http://www.ukm.my/jsm/index.html
institution Universiti Kebangsaan Malaysia
building Tun Sri Lanang Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Kebangsaan Malaysia
content_source UKM Journal Article Repository
url_provider http://journalarticle.ukm.my/
language English
description The development of in situ chloroform detection is crucial due to the high risk of carcinogenic effects associated with chloroform exposure. In this study, an electrochemical-based chloroform sensor was fabricated using undoped ZnO nanorods on indium tin oxide (ZnONRs/ITO) electrode to detect chloroform in aqueous-phase samples. Based on the results, the FESEM imaging showed that the ZnONRs exhibited an evenly distributed circular structure with a diameter of 62-90 nm, while the EDX and XRD findings confirmed the presence of Zn and O elements deposited on the electrode surface. Furthermore, the phosphate buffer solution (PBS) solution significantly affected the performance of the modified electrode with an optimal concentration and pH of 0.1 M and pH 7. The results also highlighted the vital function of the modified ZnONRs/ITO electrode as an efficient electron mediator and its catalytic potential to induce chloroform oxidation. Most importantly, the modified ZnONRs/ITO electrode was able to detect the presence of chloroform in real seawater samples, where the repeatability and reproducibility tests achieved a Relative Standard Deviation (RSD) of 1.41% and 2.61%, respectively, indicating the exceptional performance of the modified electrode. Moreover, the modified ZnONRs/ITO electrode recorded a low limit of detection and high sensitivity of 1.50 μM and 2.11 μA/cm2·mM, respectively, within a 0.010-10 mM linear dynamic range. In conclusion, the current-voltage (I-V) method proved the reliable, satisfactory, and effective fabrication of the modified ZnONRs/ITO electrode for chloroform sensing in aqueous-phase samples, including in real seawater samples.
format Article
author Haslinda Abdul Hamid,
Panapan Kunakornwattana,
Norain Isa,
Khairunisak Abdul Razak,
spellingShingle Haslinda Abdul Hamid,
Panapan Kunakornwattana,
Norain Isa,
Khairunisak Abdul Razak,
Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode
author_facet Haslinda Abdul Hamid,
Panapan Kunakornwattana,
Norain Isa,
Khairunisak Abdul Razak,
author_sort Haslinda Abdul Hamid,
title Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode
title_short Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode
title_full Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode
title_fullStr Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode
title_full_unstemmed Sensitive and selective detection of chloroform by current-voltage using ZnO nanorods modified electrode
title_sort sensitive and selective detection of chloroform by current-voltage using zno nanorods modified electrode
publisher Universiti Kebangsaan Malaysia
publishDate 2023
url http://journalarticle.ukm.my/22067/1/SE%2011.pdf
http://journalarticle.ukm.my/22067/
http://www.ukm.my/jsm/index.html
_version_ 1775623647383257088
score 13.211869

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