One-Pot Synthesis of Biocompatible CdSe/CdS Quantum Dots and Their Applications as Fluorescent Biological Labels |
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Authors: | Chuanxin Zhai Hui Zhang Ning Du Bingdi Chen Hai Huang Yulian Wu and Deren Yang |
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Affiliation: | (1) State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, 310027 Hangzhou, People’s Republic of China;(2) Department of Surgery, the Second Affiliated Hospital, School of Medicine, Zhejiang University, 310027 Hangzhou, People’s Republic of China; |
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Abstract: | We developed a novel one-pot polyol approach for the synthesis of biocompatible CdSe quantum dots (QDs) using poly(acrylic
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. |
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Keywords: | Polyol Synthesis CdSe/CdS Quantum dots Nanomaterials Luminescence Labeling |
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