Solid-phase colorimetric sensor for hypochlorite. Issue 7 (23rd February 2021)

• Record Type: Journal Article
• Authors: Wonjung, Lee; Youn, Hyunho; Bae, Jinyoung; Kim, Dong-Hwan
• Is Part Of: Analyst. Volume 146:Issue 7(2021)
• Page Start: 2301
• Page End: 2306
• Publication Date: 2021-02-23
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/d0an02448a
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : 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. Abstract : 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.