Issue 35, 2009
From the journal:

Journal of Materials Chemistry

Crosslinked, glassy styrenic surfactants stabilize quantum dots against environmental extremes†‡

Yuji Shibasaki,a   Byeong-Su Kim,a   Alexi J. Young,a   Anna L. McLoon,b   Stephen C. Ekkerb  and  T. Andrew Taton*a  

* Corresponding authors

a Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN, USA
E-mail: taton@umn.edu
Fax: +1-612-626-7541
Tel: +1-612-626-4681

b Department of Genetics, Cell Biology, and Development, University of Minnesota, Minneapolis, MN, USA

Abstract

Semiconductor, quantum dot (QD) nanoparticles (including CdSe/ZnS, CdTe/ZnS, and CdSe) were encapsulated within crosslinked shells of amphiphilic polystyrene-block-poly(acrylic acid) block copolymer. Transmission electron microscopy revealed that each particle was surrounded by a uniform layer of copolymer, and that the average diameter of the resulting QD-core micelles was between 25 and 50 nm, depending on the conditions of particle assembly. Overall, we found that aqueous suspensions of these QDs were substantially more stable to heat and pH than particles with other surface preparations; we argue that the enhanced stability is due to the uniform, hydrophobic coating of polystyrene around each particle and the reinforcement of this layer by shell-crosslinking. The biocompatibility of these particles was investigated by microinjection of particle suspension into live zebrafish embryos. The particles permanently stained the fish vasculature, but did not interfere with the normal development of the fish. We propose that QDs encapsulated in crosslinked block-copolymer shells allow QDs to be used in biological or biotechnological protocols requiring harsh reaction conditions.

Graphical abstract: Crosslinked, glassy styrenic surfactants stabilize quantum dots against environmental extremes

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Article information

DOI
https://doi.org/10.1039/B902275A
Article type
Communication
Submitted
04 Feb 2009
Accepted
29 May 2009
First published
19 Jun 2009

J. Mater. Chem., 2009,19, 6324-6327

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Crosslinked, glassy styrenic surfactants stabilize quantum dots against environmental extremes

Y. Shibasaki, B. Kim, A. J. Young, A. L. McLoon, S. C. Ekker and T. A. Taton, J. Mater. Chem., 2009, 19, 6324 DOI: 10.1039/B902275A

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