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Proceedings Paper

Synthesis and properties of water-soluble CdSe/Zn1-xMnxS semiconductor quantum dots using an amphiphilic polymer
Author(s): Shizhong Wang; Angelique Y. Louie; Susan M. Kauzlarich
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Paper Abstract

We report the phase transfer of hydrophobic CdSe/Zn1-xMnxS quantum dots (QDs) into water by encapsulation with octylamine-modified poly(acrylic acid) (PAA). CdSe/Zn1-xMnxS QDs are of interest as multimodality biological probes where the photoluminescence and magnetic relaxivity can be tuned independently. Different percentages of the carboxyl groups in PAA were grafted with octylamine molecules and the modified PAA was used for capping CdSe/Zn1-xMnxS QDs to make them water soluble. We investigated the optical properties and the solubility of the CdSe/Zn1-xMnxS QDs in water. It was found that the PAA with a modification percentage of ~ 45% resulted in soluble CdSe/Zn1-xMnxS QDs with the highest quantum yield (QY) in water of approximately 20%. The QY of CdSe/Zn1-xMnxS QDs in water was lower than the initial measurement in chloroform and dropped in the initial stages of phase transfer, stabilizing at 20%. Hydrodynamic size of the polymer encapsulated CdSe/Zn1-xMnxS QDs in water was evaluated by dynamic light scattering (DLS). The smallest average hydrodynamic diameter of ~ 30 nm was achieved when the molecular ratio of QDs to PAA for capping was 1 nanomole of QDs to 24 micromole of monomer unit.

Paper Details

Date Published: 5 February 2007
PDF: 9 pages
Proc. SPIE 6448, Colloidal Quantum Dots for Biomedical Applications II, 64480A (5 February 2007); doi: 10.1117/12.701447
Show Author Affiliations
Shizhong Wang, Univ. of California, Davis (United States)
Angelique Y. Louie, Univ. of California, Davis (United States)
Susan M. Kauzlarich, Univ. of California, Davis (United States)

Published in SPIE Proceedings Vol. 6448:
Colloidal Quantum Dots for Biomedical Applications II
Marek Osinski; Thomas M. Jovin; Kenji Yamamoto, Editor(s)

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