title: One-Pot Synthesis of Biocompatible CdSe/CdS Quantum Dots and Their Applications as Fluorescent Biological Labels.
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.
authors: State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, 310027, Hangzhou, People's Republic of China.
authors: Chuanxin
authors: C
authors: Zhai
authors: State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, 310027, Hangzhou, People's Republic of China.
authors: Hui
authors: H
authors: Zhang
authors: State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, 310027, Hangzhou, People's Republic of China.
authors: Ning
authors: N
authors: Du
authors: State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, 310027, Hangzhou, People's Republic of China.
authors: Bingdi
authors: B
authors: Chen
authors: Department of Surgery, the Second Affiliated Hospital, School of Medicine, Zhejiang University, 310027, Hangzhou, People's Republic of China.
authors: Hai
authors: H
authors: Huang
authors: Department of Surgery, the Second Affiliated Hospital, School of Medicine, Zhejiang University, 310027, Hangzhou, People's Republic of China.
authors: Yulian
authors: Y
authors: Wu
authors: State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, 310027, Hangzhou, People's Republic of China. mseyang@zju.edu.cn.
authors: Deren
authors: D
authors: Yang
keywords: CdSe/CdS; Labeling; Luminescence; Nanomaterials; Polyol Synthesis; Quantum dots