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Facile Synthesis and Characterization of Highly Fluorescent and Biocompatible N-acetyl-L-cysteine Capped CdTe/CdS/ZnS core/shell/shell Quantum Dots in Aqueous Phase

Facile Synthesis and Characterization of Highly Fluorescent and Biocompatible N-acetyl-L-cysteine Capped CdTe/CdS/ZnS core/shell/shell Quantum Dots in Aqueous Phase

Qi Xiao, Shan Huang, Wei Su, W H Chan, Yi Liu

Nanotechnology. 2012 Dec 14;23(49):495717.

PMID: 23165590

Abstract:

The synthesis of water-soluble quantum dots (QDs) in aqueous phase has received much attention recently. To date various kinds of QDs such as CdTe, CdSe, CdTe/CdS and CdSe/ZnS have been synthesized by aqueous methods. However, generally poor-quality QDs (photoluminescent quantum yield (PLQY) lower than 30%) are obtained via this method and the 3-mercaptopropionic acid stabilizer is notorious for its toxicity and awful odor. Here we introduce a novel thiol ligand, N-acetyl-L-cysteine, as an ideal stabilizer that is successfully employed to synthesize high-quality CdTe/CdS/ZnS QDs via a simple aqueous phase. The core/shell/shell structures of the CdTe/CdS/ZnS QDs were verified by x-ray photoelectron spectroscopy, energy dispersive x-ray spectroscopy, x-ray powder diffraction and transmission electron microscopy. These QDs not only possess a high PLQY but also have excellent photostability and favorable biocompatibility, which is vital for many biological applications. This type of water-dispersed QD is a promising candidate for fluorescent probes in biological and medical fields.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS769102	CdS/ZnS core-shell type quantum dots			Price

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