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Lookup NU author(s): Professor Yen Nee Tan
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© 2021 Elsevier B.V.. Designing a simple, inexpensive, and sensitive colorimetric sensor for the detection of toxic species in drinking water is of great importance. In this paper, we have demonstrated a simple and sensitive colorimetric assay for naked-eye detection of mercury ions (Hg2+) in water based on gold nanoparticles-catalyzed clock reaction. Citrate-capped Au nanoparticles (AuNPs) were used to catalyze the reduction of methylene blue (MB) to leucomethylene blue (LMB) by hydrazine. However, Hg2+ ions can reduce the catalytic activity of AuNPs in this clock reaction, resulting in the longer reaction time for color transformation of MB from blue to colorless LMB solution. Based on this principle, we have developed an ultrasensitive colorimetric assay that can selectively detect Hg2+ in the concentration range of 5 to 1000 nM with a limit of detection (LOD) of 4.3 nM, which is well below the maximum allowable concentration for Hg2+ in drinking water (10 nM) as defined by the United States Environmental Protection Agency. Owing to the rapidity and simplicity of the naked eye detection process, we expect that this AuNPs-catalyzed clock reaction could put forward an insight for the detection of toxic Hg2+ ions in real water samples, opening up new avenues for developing cost-effective and portable nanosensors for environmental applications.
Author(s): Khani H, Abbasi S, Tavakkoli Yaraki M, Tan YN
Publication type: Review
Publication status: Published
Journal: Journal of Molecular Liquids
Year: 2022
Volume: 345
Print publication date: 01/01/2022
Online publication date: 03/12/2021
Acceptance date: 28/11/2021
ISSN (print): 0167-7322
ISSN (electronic): 1873-3166
Publisher: Elsevier B.V.
URL: https://doi.org/10.1016/j.molliq.2021.118243
DOI: 10.1016/j.molliq.2021.118243
