High quality ZnS and core/shell CdSe/ZnS nanoparticles from air-stable precursors

Shizhong Wang; Jing Zou; Benjamin R. Jarrett; Sungjin Cho; Angelique Y. Louie; Susan M. Kauzlarich

doi:10.1117/12.663346

27 March 2006 High quality ZnS and core/shell CdSe/ZnS nanoparticles from air-stable precursors

Shizhong Wang, Jing Zou, Benjamin R. Jarrett, Sungjin Cho, Angelique Y. Louie, Susan M. Kauzlarich

Proceedings Volume 6096, Colloidal Quantum Dots for Biomedical Applications; 60960U (2006) https://doi.org/10.1117/12.663346
Event: SPIE BiOS, 2006, San Jose, California, United States

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.

Citation Download Citation

Shizhong Wang, Jing Zou, Benjamin R. Jarrett, Sungjin Cho, Angelique Y. Louie, and Susan M. Kauzlarich "High quality ZnS and core/shell CdSe/ZnS nanoparticles from air-stable precursors", Proc. SPIE 6096, Colloidal Quantum Dots for Biomedical Applications, 60960U (27 March 2006); https://doi.org/10.1117/12.663346

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KEYWORDS

Zinc

Nanoparticles

Sulfur

Particles

Cadmium

Transmission electron microscopy

Absorption

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