Facile aqueous synthesis of ZnInS quantum dots and its application for selective detection of Co2+ ions

Nkosingiphile Zikalala; Sundararajan Parani; Oluwatobi Samuel Oluwafemi

doi:10.1088/1361-6528/abf193

Facile aqueous synthesis of ZnInS quantum dots and its application for selective detection of Co²⁺ ions

Nkosingiphile Zikalala, Sundararajan Parani, Oluwatobi Samuel Oluwafemi

Chemical Sciences

University of Johannesburg

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

The synthesis of ZnInS (ZIS) quantum dots (QDs) in aqueous medium using thioglycolic acid (TGA) and sodium citrate as dual capping agents has been reported. The as-synthesized ZIS QDs were water soluble, emitting at 512 nm and nearly spherical in shape with average particle size of 8.9 ± 1.4 nm. The as-synthesized ZIS QDs were tested for its fluorescence response against different metal ions and the results revealed that ZIS QDs were selectively quenched by Co²+ ions compared to other ions. The fluorescence sensing experiment showed that ZIS QDs has a linear response against the concentration of Co²⁺ ions (0.1–100 μM) with the detection limit of 0.099 μM. Based on the transmission electron microscope and absorption spectroscopy analyzes, the fluorescence quenching is attributed to the formation of surface ligand-metal complex (TGA-Co²⁺ ions) which caused aggregation of the QDs. The present method explores the synthesis of zero-dimentional ZIS QDs and its potential in the selective detection of Co²⁺ ions in aqueous solution.

Original language	English
Article number	295503
Journal	Nanotechnology
Volume	32
Issue number	29
DOIs	https://doi.org/10.1088/1361-6528/abf193
Publication status	Published - 16 Jul 2021

Keywords

Cobalt
Fluorescence
Quantum dots
Sensing
ZnInS

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

Access to Document

10.1088/1361-6528/abf193

Cite this

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title = "Facile aqueous synthesis of ZnInS quantum dots and its application for selective detection of Co2+ ions",

abstract = "The synthesis of ZnInS (ZIS) quantum dots (QDs) in aqueous medium using thioglycolic acid (TGA) and sodium citrate as dual capping agents has been reported. The as-synthesized ZIS QDs were water soluble, emitting at 512 nm and nearly spherical in shape with average particle size of 8.9 ± 1.4 nm. The as-synthesized ZIS QDs were tested for its fluorescence response against different metal ions and the results revealed that ZIS QDs were selectively quenched by Co2+ ions compared to other ions. The fluorescence sensing experiment showed that ZIS QDs has a linear response against the concentration of Co2+ ions (0.1–100 μM) with the detection limit of 0.099 μM. Based on the transmission electron microscope and absorption spectroscopy analyzes, the fluorescence quenching is attributed to the formation of surface ligand-metal complex (TGA-Co2+ ions) which caused aggregation of the QDs. The present method explores the synthesis of zero-dimentional ZIS QDs and its potential in the selective detection of Co2+ ions in aqueous solution.",

keywords = "Cobalt, Fluorescence, Quantum dots, Sensing, ZnInS",

author = "Nkosingiphile Zikalala and Sundararajan Parani and Oluwafemi, {Oluwatobi Samuel}",

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year = "2021",

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AU - Zikalala, Nkosingiphile

AU - Parani, Sundararajan

AU - Oluwafemi, Oluwatobi Samuel

PY - 2021/7/16

Y1 - 2021/7/16

N2 - The synthesis of ZnInS (ZIS) quantum dots (QDs) in aqueous medium using thioglycolic acid (TGA) and sodium citrate as dual capping agents has been reported. The as-synthesized ZIS QDs were water soluble, emitting at 512 nm and nearly spherical in shape with average particle size of 8.9 ± 1.4 nm. The as-synthesized ZIS QDs were tested for its fluorescence response against different metal ions and the results revealed that ZIS QDs were selectively quenched by Co2+ ions compared to other ions. The fluorescence sensing experiment showed that ZIS QDs has a linear response against the concentration of Co2+ ions (0.1–100 μM) with the detection limit of 0.099 μM. Based on the transmission electron microscope and absorption spectroscopy analyzes, the fluorescence quenching is attributed to the formation of surface ligand-metal complex (TGA-Co2+ ions) which caused aggregation of the QDs. The present method explores the synthesis of zero-dimentional ZIS QDs and its potential in the selective detection of Co2+ ions in aqueous solution.

AB - The synthesis of ZnInS (ZIS) quantum dots (QDs) in aqueous medium using thioglycolic acid (TGA) and sodium citrate as dual capping agents has been reported. The as-synthesized ZIS QDs were water soluble, emitting at 512 nm and nearly spherical in shape with average particle size of 8.9 ± 1.4 nm. The as-synthesized ZIS QDs were tested for its fluorescence response against different metal ions and the results revealed that ZIS QDs were selectively quenched by Co2+ ions compared to other ions. The fluorescence sensing experiment showed that ZIS QDs has a linear response against the concentration of Co2+ ions (0.1–100 μM) with the detection limit of 0.099 μM. Based on the transmission electron microscope and absorption spectroscopy analyzes, the fluorescence quenching is attributed to the formation of surface ligand-metal complex (TGA-Co2+ ions) which caused aggregation of the QDs. The present method explores the synthesis of zero-dimentional ZIS QDs and its potential in the selective detection of Co2+ ions in aqueous solution.

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