Influence of Structural Properties of Oleic Acid-Capped CdSe/ZnS Quantum Dots in the Detection of Hg2+ Ions

被引：3

作者：

Calderon, Fredy Giovany Ortiz ^{[1
,2
]}

Pineros, Brayan Stiven Gomez ^{[1
]}

McClenaghan, Nathan D. ^{[2
]}

Granados-Oliveros, Gilma ^{[1
]}

机构：

[1] Univ Nacl Colombia, Fac Ciencias, Dept Quim, Grp Sintesis Organ Sostenible, Bogota, Colombia

[2] Univ Bordeaux, Inst Sci Mol, CNRS, UMR 5255, F-33405 Talence, France

来源：

JOURNAL OF FLUORESCENCE | 2025年 / 35卷 / 06期

关键词：

CdSe/ZnS quantum dots; Detection of Hg2+ ions; Quenching and enhancing of fluorescence; CORE-SHELL; SELECTIVE DETERMINATION; OPTICAL-PROPERTIES; COPPER-ION; SURFACE; NANOCRYSTALS; THICKNESS; SENSOR; CHARGE; DECAY;

D O I：

10.1007/s10895-024-03828-0

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

Oleic acid-capped CdSe/ZnS quantum dots (QDs) were used to investigate their photoluminescence (PL) response to Hg2+ ions as a function of the surface properties of QDs. Three distinctly-size CdSe/ZnS QDs were obtained by varying the molar ratio of shell precursors, which were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), Fourier-Transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), absorption spectroscopy, and time-resolved fluorescence spectroscopy. Results revealed the obtention of zinc blende nanocrystals with sizes ranging from 2.7 to 3.2 nm (+/- 0.5) and ZnS thickness between 0.3 and 1.0 monolayer (ML). The variation of the [S]/[Zn] molar ratio introduced chemical species that act as traps, affecting the PL properties differently. Depending on the thickness of the shell and chemical speciation on surface, Hg2+ ions could induce quenching or enhancement of PL. Detection of mercury ions was evaluated in terms of Stern-Volmer equation, where the limit of detection (LOD) for the PL quenching system was 11.2 nM, while for the PL enhancing systems were 8.98 nM and 10.7 nM. Results demonstrate the performance of oleic acid-capped CdSe/ZnS QDs to detect Hg2+ and their capacity to turn the PL on/off depending on surface properties.

引用

页码：4385 / 4397

页数：13

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