Citation: TANG Zi-Long, LI Dong-Mei, CHENG Jing-Wei, JIANG Jie-Ru. Preparation and Fluorescence Properties of Aqueous Soluble Thiourea Modified ZnSe:Cu Quantum Dots[J]. Acta Physico-Chimica Sinica, ;2013, 29(03): 653-659. doi: 10.3866/PKU.WHXB201212272 shu

Preparation and Fluorescence Properties of Aqueous Soluble Thiourea Modified ZnSe:Cu Quantum Dots

1.
College of Materials Science and Engineering, Shanghai University, Shanghai 200072, P.R. China

Received Date: 1 November 2012
Available Online: 27 December 2012

Aqueous phase Cu doped ZnSe (ZnSe:Cu) quantum dots (QDs) stabilized with mercaptopropionic acid were prepared, and thiourea was used as a surface modifier to obtain core-shell ZnSe:Cu/ZnS QDs. QDs had a sphalerite structure, were uniformly dispersed, had an average particle size of approximately 5 nm and an emission peak at around 460 nm. After thiourea modification, a wide band-gap ZnS shell was coated on the QDs to passivate the surface, reduce surface states, and significantly improve fluorescence intensity. Thiourea modified ZnSe:Cu/ZnS QDs exhibit better surface passivation, fluorescence efficiency, and stability than those of other surface modifiers like Na₂S and thioacetamide. Quantum yields were further improved after UV irradiation eliminated surface dangling bonds.
- Quantum dot,
- ZnSe:Cu/ZnS,
- Aqueous phase synthesis,
- Thiourea modified,
- Low toxicity,
- UV irradiation
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沈阳化工大学材料科学与工程学院沈阳 110142