Bifunctional Multidentate Ligand Modified Highly Stable Water-Soluble Quantum Dots

We have designed and synthesized a multidentate polymer ligand used for water-solubilization of luminescent quantum dots (QDs). The synthesis of the multidentate ligand (PAA-g-MEA) was based on several thiol groups grafted to a linear polymer chain through a simple carboxy-amine coupling reaction be...

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Bibliographic Details
Published in:Inorganic chemistry 2010-04, Vol.49 (8), p.3768-3775
Main Authors: Liu, Lu, Guo, Xuhong, Li, Yan, Zhong, Xinhua
Format: Article
Language:English
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Summary:We have designed and synthesized a multidentate polymer ligand used for water-solubilization of luminescent quantum dots (QDs). The synthesis of the multidentate ligand (PAA-g-MEA) was based on several thiol groups grafted to a linear polymer chain through a simple carboxy-amine coupling reaction between poly(acryl acid) (PAA) and mercaptoethylamine (MEA). Water-soluble QDs capped with these PAA-g-MEA ligands were prepared via ligand exchange from the original hydrophobic ones. The resulting PAA-g-MEA capped water-soluble QDs with relatively small hydrodynamic diameters possess higher photoluminescence quantum yields than the initial hydrophobic QDs, extraordinary stability over extended periods of time and over a broad pH range (3−14), salt concentrations (up to saturated NaCl solution), and thermal treatment at 100 °C.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic902469d