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Proceedings Paper

Synthesis and applications of quantum dots and magnetic quantum dots
Author(s): Jackie Y. Ying; Yuangang Zheng; S. Tamil Selvan
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Paper Abstract

We have developed a new synthetic method for producing high-quality quantum dots (QDs) in aqueous solution for biological imaging applications. The glutathione-capped CdTe, ZnSe and Zn1-xCdxSe alloyed QDs derived are tunable in fluorescence emissions between 360 nm and 700 nm. They show high quantum yields (QYs) of up to 50%, with narrow bandwidths of 19-55 nm. The synthesis of glutathione-capped QDs is simple and cost-effective compared to the conventional organometallic approaches. It can be easily scaled up for the commercial production of alloyed nanocrystals of various compositions. We have also demonstrated the fabrication of magnetic quantum dots (MQDs) through a seed-mediated approach. The formation and assembly of these bifunctional nanocomposites have been elucidated by high-resolution transmission electron microscopy (HRTEM). The MQDs exhibit superparamagnetism and tunable emissions characteristic of the components in this hybrid system. We have created biocompatible silica-coated MQDs that effectively target the cell membranes.

Paper Details

Date Published: 22 February 2008
PDF: 5 pages
Proc. SPIE 6866, Colloidal Quantum Dots for Biomedical Applications III, 686602 (22 February 2008); doi: 10.1117/12.784053
Show Author Affiliations
Jackie Y. Ying, Institute of Bioengineering and Nanotechnology (Singapore)
Yuangang Zheng, Institute of Bioengineering and Nanotechnology (Singapore)
S. Tamil Selvan, Institute of Bioengineering and Nanotechnology (Singapore)

Published in SPIE Proceedings Vol. 6866:
Colloidal Quantum Dots for Biomedical Applications III
Marek Osinski; Thomas M. Jovin; Kenji Yamamoto, Editor(s)

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