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Issue 7, 2021
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Solid-phase colorimetric sensor for hypochlorite

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By taking advantage of the powerful oxidation property of hypochlorite (OCl), we developed a solid-phase colorimetric sensor for the detection of OCl based on 13 nm AuNPs immobilized on a 3-aminopropyltriethoxysilane APTES-coated substrate. This colorimetric sensor utilizes the aggregation and anti-aggregation properties of AuNPs arising from the interaction between dithiothreitol (DTT) and OCl. When the amount of OCl increases, the color of the substrate changes from blue to red, allowing for naked-eye detection at concentrations as low as 2.48 μM within the reaction time of 5 minutes. Unlike conventional solution-based colorimetric sensors that can be easily affected by ionic strength, pH values, and temperature, this solid-phase sensor shows a more stable detection performance. Additionally, this solid-phase sensor can be further miniaturized, providing high availability and durability for use in daily life.

Graphical abstract: Solid-phase colorimetric sensor for hypochlorite

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Article information

25 Dec 2020
14 Feb 2021
First published
15 Feb 2021

Analyst, 2021,146, 2301-2306
Article type

Solid-phase colorimetric sensor for hypochlorite

L. Wonjung, H. Youn, J. Bae and D. Kim, Analyst, 2021, 146, 2301
DOI: 10.1039/D0AN02448A

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