Abstract
We report the synthesis of high quality ZnS nanoparticles using sulfur and zinc acetate as the S and Zn source, respectively. It was found that sulfur and zinc acetate could be easily dissolved in the mixture of trioctylphosphine oxide (TOPO) and hexadecylamine (HDA) at a temperature of about 65°C and ZnS nanoparticles were generated at temperatures above 150°C. These reactive species of sulfur and zinc were also used for an epitaxial growth of ZnS shell around a CdSe core. The formation of ZnS nanoparticles was confirmed by powder X-ray diffraction (XRD). Particle size and size distribution were studied by transmission electron microscopy (TEM). Optical properties were characterized by a combination of UV-vis and photoluminescence (PL) spectroscopy. The PL quantum yield of the CdSe/ZnS nanoparticles reached about 66% compared with the dye, Rhodamine 6G (R6G). The present synthetic strategy is a "greener" and simpler synthetic scheme due to the use of air-stable and environmentally benign reagents of sulfur and zinc acetate instead of air-sensitive ones such as dimethylzinc and bis(trimethylsilyl) sulfide.
Original language | English (US) |
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Title of host publication | Progress in Biomedical Optics and Imaging - Proceedings of SPIE |
Volume | 6096 |
DOIs | |
State | Published - 2006 |
Event | Colloidal Quantum Dots for Biomedical Applications - San Jose, CA, United States Duration: Jan 22 2006 → Jan 24 2006 |
Other
Other | Colloidal Quantum Dots for Biomedical Applications |
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Country | United States |
City | San Jose, CA |
Period | 1/22/06 → 1/24/06 |
Keywords
- Core/shell structure
- Nanoparticles
- Optical properties
- Quantum dots
- Semiconductor
- Synthesis
ASJC Scopus subject areas
- Engineering(all)