Water-soluble silica-coated ZnS : Mn nanoparticles as fluorescent sensors for the detection of ultratrace copper(ii) ions in seawater. Issue 2 (13th December 2016)

• Record Type: Journal Article
• Authors: Qin, Junjie; Dong, Bohua; Gao, Rongjie; Su, Ge; Han, Jiwei; Li, Xue; Liu, Wei; Wang, Wei; Cao, Lixin
• Is Part Of: Analytical methods. Volume 9:Issue 2(2017)
• Page Start: 322
• Page End: 328
• Publication Date: 2016-12-13
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c6ay02486f
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : In this study, silica-coated ZnS : Mn nanoparticles (ZnS : Mn/SiO2 ) were synthesized and proven to be sensitive and selective for Cu 2+ detection in seawater. Abstract : Quantum dots (QDs), semiconductor particles with all three dimensions confined to the nanometer length scale, are good choices for the detection of heavy metals in aqueous media. In this study, silica-coated ZnS : Mn nanoparticles (ZnS : Mn/SiO2 ) were synthesized by coating hydrophobic ZnS : Mn nanoparticles with silica shells through a microemulsion method. The ZnS : Mn/SiO2 QDs exhibited satisfying dispersibility and luminescence properties in seawater. After a series of experiments were conducted in real seawater, the ZnS : Mn/SiO2 QDs were proven to be sensitive and selective for Cu 2+ detection. The quenching of the fluorescence of the QDs with the addition of Cu 2+ is well described by the Stern–Volmer pattern. The detection of Cu 2+ concentrations in seawater can be achieved over a linear range from 8.16 × 10 −8 to 4.96 × 10 −4 mol L −1 . Studies show that ZnS : Mn/SiO2 QDs have great potential to be used as sensors for Cu 2+ analysis from low to high concentrations in seawater.