One-Pot Synthesis of Biocompatible CdSe-CdS Quantum Dots and Their Applications as Fluorescent Biological LabelsReport as inadecuate




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Nanoscale Res Lett

, 6:31

Online First articles in Volume 6 2011. These articles were published as Online First on SpringerLink in 2010. They should be cited with a 2011 publication year

Abstract

We developed a novel one-pot polyol approach for the synthesis of biocompatible CdSe quantum dots QDs using polyacrylic acid PAA as a capping ligand at 240°C. The morphological and structural characterization confirmed the formation of biocompatible and monodisperse CdSe QDs with several nanometers in size. The encapsulation of CdS thin layers on the surface of CdSe QDs CdSe-CdS core–shell QDs was used for passivating the defect emission 650 nm and enhancing the fluorescent quantum yields up to 30% of band-to-band emission 530–600 nm. Moreover, the PL emission peak of CdSe-CdS core–shell QDs could be tuned from 530 to 600 nm by the size of CdSe core. The as-prepared CdSe-CdS core–shell QDs with small size, well water solubility, good monodispersity, and bright PL emission showed high performance as fluorescent cell labels in vitro. The viability of QDs-labeled 293T cells was evaluated using a 3-4,5-dimethylthiazol-2-diphenyltertrazolium bromide MTT assay. The results showed the satisfactory >80% biocompatibility of as-synthesized PAA-capped QDs at the Cd concentration of 15 μg-ml.

KeywordsPolyol Synthesis CdSe-CdS Quantum dots Nanomaterials Luminescence Labeling  Download fulltext PDF



Author: Chuanxin Zhai - Hui Zhang - Ning Du - Bingdi Chen - Hai Huang - Yulian Wu - Deren Yang

Source: https://link.springer.com/







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