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7 March 2019 Synthesis and characterization of colloidal ZnTe/ZnS quantum dots
Gavin P. Gonzales, Arjun Senthil, Gema J. Alas, Nathan J. Withers, Sergei A. Ivanov, Dale L. Huber, Marek Osiński
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Proceedings Volume 10892, Colloidal Nanoparticles for Biomedical Applications XIV; 1089206 (2019) https://doi.org/10.1117/12.2515646
Event: SPIE BiOS, 2019, San Francisco, California, United States
Abstract
Colloidal quantum dots (QDs) emitting in the visible spectrum are of interest for many biomedical applications, including bioimaging, biosensing, drug delivery, and photodynamic therapy. However, a significant limitation is that QDs typically contain cadmium, which is highly cytotoxic and makes prospects for their FDA approval for human treatment very unlikely. Previous work on biocompatible QDs has focused on indium phosphide and zinc oxide as alternative materials for QDs. However, these nanoparticles have also been shown to be cytotoxic. High-efficiency luminescent ZnTe-based QDs could be a reasonable alternative to Cd-containing QDs. We started our recent studies of ZnTe core, zinc chalcogenide shell QDs with synthesis, structural characterization, and investigation of optical properties of ZnTe/ZnSe colloidal QDs that displayed a blue-green photoluminescence under UV excitation. In this paper, the characteristics of ZnTe/ZnS QDs are compared to those of ZnTe/ZnSe QDs. We conclude that ZnTe/ZnS QDs are appealing candidates for various biomedical applications instead of the currently prominent alternative: cadmium-chalcogenide core QDs.
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Gavin P. Gonzales, Arjun Senthil, Gema J. Alas, Nathan J. Withers, Sergei A. Ivanov, Dale L. Huber, and Marek Osiński "Synthesis and characterization of colloidal ZnTe/ZnS quantum dots", Proc. SPIE 10892, Colloidal Nanoparticles for Biomedical Applications XIV, 1089206 (7 March 2019); https://doi.org/10.1117/12.2515646
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KEYWORDS
Quantum dots
Transmission electron microscopy
Luminescence
Quantum efficiency
Nanocrystals
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