Characterization of the Organic Ligand Shell of Semiconductor Quantum Dots by Fluorescence Quenching Experiments

被引：45

作者：

Boldt, Klaus ^{[1
]}

Jander, Sebastian ^{[1
]}

Hoppe, Kathrin ^{[1
]}

Weller, Horst ^{[1
]}

机构：

[1] Univ Hamburg, Inst Phys Chem, D-20146 Hamburg, Germany

来源：

ACS NANO | 2011年 / 5卷 / 10期

关键词：

quantum dots; ligands; electron transfer; FRET; cysteine; poly(ethylene) glycol; RESONANCE ENERGY-TRANSFER; SINGLE DYE MOLECULES; EXTINCTION COEFFICIENT; TRANSFER MECHANISMS; NANOCRYSTALS; NANOPARTICLES; CDSE; ELECTRON; EXTRACTION; BIOLOGY;

D O I：

10.1021/nn202748v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present the characterization of the organic ligand shell of CdSe/CdxZn1-xS/ZnS nanoparticles by means of fluorescence quenching experiments. Both electron scavengers and acceptors for resonance energy transfer were employed as probes. Different quenching behavior for short and long chain thiol ligands in water was found. It could be shown that poly(ethylene oxide) (PEO)-capping of the particles comprises a densely packed inner shell and a loosely packed outer shell in which ions and small molecules diffuse unhindered. A quantitative uptake of quencher molecules into the PEO shell was observed, through which the particle volume including the ligand sphere could be determined.

引用

页码：8115 / 8123

页数：9

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