Green and facile synthesis of high-quality water-soluble Ag-In-S/ZnS core/shell quantum dots with obvious bandgap and sub-bandgap excitations

Chen, Yanyan; Wang, Qiang; Zha, Tianyong; Min, Jigang; Gao, Ji‐Xing; Zhou, Cunhui; Li, Jingyang; Zhao, Mengdi; Li, Shenjie

doi:10.1016/j.jallcom.2018.04.242

Cited by 17 publications

(18 citation statements)

References 33 publications

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“…These syntheses can be conducted in water at reflux, under hydrothermal conditions, or under microwave irradiation. Glutathione (GSH) and GSH associated with cysteamine or sodium citrate are the most commonly used ligands for the preparation of high-quality dots. − A few reports describe also the use of thioglycolic acid (TGA) or TGA combined with poly(acrylic acid), , 3-mercaptopropionic acid (3-MPA), mercaptosuccinic acid associated with sodium citrate, cysteine, , N -acetylcysteine, poly(ethylenimine), , gelatin, carboxymethylcellulose, and chitosan as capping agents. A cation exchange process using Ag 2 S QDs as precursors of AIS and AIZS QDs has also been reported .…”

Section: Introductionmentioning

confidence: 99%

Aqueous Synthesis for Highly Emissive 3-Mercaptopropionic Acid-Capped AIZS Quantum Dots

et al. 2020

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Highly fluorescent and color tunable AgInS 2 (AIS) and (AgInS 2 )x(ZnS) 1-x (AIZS) quantum dots (QDs) were prepared via a facile aqueous-phase synthesis using AgNO 3 , In(NO 3 ) 3 , Zn(OAc) 2 and Na 2 S as precursors and 3-mercaptopropionic acid (3-MPA) as ligand. Produced AIZS QDs exhibit a small diameter (ca. 2.1 nm) and a cubic structure. Ag-3-MPA and In-3-MPA complexes formed during the preparation of AIS cores were found to play a key role on the fate of the reaction and an atypical blue-shift of the PL emission was observed with the increase of the Ag/In ratio. The photoluminescence quantum yield (PL QY) of AIS QDs is modest but increased markedly after the alloying and shelling with ZnS (up to 65%). Size and composition-selective precipitations allowed to separate up to 13 fractions of AIZS QDs with exceptionally high PL QYs (up to 78%), which is the highest value reported to date for AIZS QDs prepared in aqueous phase. These high PL QYs combined to their good colloidal stability and photostability make AIZS QDs of high potential as cadmium-free fluorescent probes for various applications like bio-imaging or sensing.

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Section: Introductionmentioning

confidence: 99%

Aqueous Synthesis for Highly Emissive 3-Mercaptopropionic Acid-Capped AIZS Quantum Dots

et al. 2020

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“…99 Another report displayed PL quenching of AgInS 2 QDs after they were exposed to Pb 2+ ions. 57 The QDs were capped with MSA, a dicarboxylic acid with a thiol group. It is suspected that the Pb 2+ ions bonded to the carbonyl groups on the QD surface to form R–COO–Pb 2+ –OOC–R complex as seen in Lui et al report, 99 which might have induced defects, thus increasing non-radiative decay pathways.…”

Section: Fluorescence Detection Mechanismsmentioning

confidence: 99%

“…It is suspected that the Pb 2+ ions bonded to the carbonyl groups on the QD surface to form R–COO–Pb 2+ –OOC–R complex as seen in Lui et al report, 99 which might have induced defects, thus increasing non-radiative decay pathways. 57 …”

Section: Fluorescence Detection Mechanismsmentioning

confidence: 99%

A review on I–III–VI ternary quantum dots for fluorescence detection of heavy metals ions in water: optical properties, synthesis and application

et al. 2022

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“…The use of solvothermal strategies (autoclave) for QDs synthesis has some advantages. The increment of the water boiling point at high pressure accelerates the QDs’ growth, and in consequence, the surface defects are reduced [ 59 ]. Siyu Liu et al have synthesized CuInS 2 QDs for 21 h to obtain the emission at near-infrared wavelengths, but it is possible to control the emission wavelength by reducing the synthesis time [ 60 ].…”

Section: Synthesis Of Ternary Quantum Dotsmentioning

confidence: 99%

Ternary Quantum Dots in Chemical Analysis. Synthesis and Detection Mechanisms

et al. 2021

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Ternary quantum dots (QDs) are novel nanomaterials that can be used in chemical analysis due their unique physicochemical and spectroscopic properties. These properties are size-dependent and can be adjusted in the synthetic protocol modifying the reaction medium, time, source of heat, and the ligand used for stabilization. In the last decade, several spectroscopic methods have been developed for the analysis of organic and inorganic analytes in biological, drug, environmental, and food samples, in which different sensing schemes have been applied using ternary quantum dots. This review addresses the different synthetic approaches of ternary quantum dots, the sensing mechanisms involved in the analyte detection, and the predominant areas in which these nanomaterials are used.

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Green and facile synthesis of high-quality water-soluble Ag-In-S/ZnS core/shell quantum dots with obvious bandgap and sub-bandgap excitations

Cited by 17 publications

References 33 publications

Aqueous Synthesis for Highly Emissive 3-Mercaptopropionic Acid-Capped AIZS Quantum Dots

Aqueous Synthesis for Highly Emissive 3-Mercaptopropionic Acid-Capped AIZS Quantum Dots

A review on I–III–VI ternary quantum dots for fluorescence detection of heavy metals ions in water: optical properties, synthesis and application

Ternary Quantum Dots in Chemical Analysis. Synthesis and Detection Mechanisms

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