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Published on: February 6, 2016
Mercaptopropionic acid-capped Mn(2+):ZnSe/ZnO quantum dots with both downconversion and upconversion emissions for
Bingxia Zhao1, Yulian Yao, Kai Yang
1State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China. wwli@sjtu.edu.cn ksun@sjtu.edu.cn.
We synthesized mercaptopropionic acid-capped manganese-doped zinc selenide/zinc oxide (Mn(2+):ZnSe/ZnO) doped quantum dots (d-dots) using a cost-effective hydrothermal method. These water-soluble d-dots show high photoluminescence quantum yield and can enter cell nuclei, making them promising fluorescent labels.
Area of Science:
- Materials Science
- Nanotechnology
- Biochemistry
Background:
- Doped quantum dots (d-dots) are valuable for biological applications as fluorescent biosensors and biolabels.
- Developing efficient and cost-effective synthesis methods for d-dots is crucial for their widespread use.
Purpose of the Study:
- To synthesize mercaptopropionic acid (MPA)-capped Mn(2+):ZnSe/ZnO d-dots.
- To characterize their optical properties and potential for biological applications.
Main Methods:
- Facile and cost-efficient hydrothermal synthesis route.
- Characterization of water-soluble d-dots including optical properties (emission, PLQY, upconversion) and size.
- Assessment of cell nucleus penetration capability.
Main Results:
- Successful synthesis of MPA-capped Mn(2+):ZnSe/ZnO d-dots.
- Achieved strong emission at ~580 nm with a record high photoluminescence quantum yield (PLQY) of 31% for aqueous routes.
- Demonstrated upconversion emission at 800 nm excitation.
- Confirmed cell nucleus access for ~6.7 nm d-dots without surface modification.
Conclusions:
- The synthesized d-dots possess excellent optical properties and high water solubility.
- Their ability to penetrate the cell nucleus positions them as potent fluorescent labels for biological imaging.
- This study presents a significant advancement in the development of high-performance doped quantum dots for biotechnological applications.
