Novel Efficient Routes to Encapsulated Zinc Oxide Quantum Dots and Nanoparticles From Well-Defined Organometallic Precursors

Janusz Lewiński 1Marek K. Kościelski 1Wojciech Bury 1Iwona Justyniak 2

1. Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, Warszawa 00-664, Poland
2. Polish Academy of Sciences, Institute of Physical Chemistry, Kasprzaka 44/52, Warszawa 01-224, Poland

Abstract

The unique characteristics of zinc oxide makes it the most diverse inorganic material, with applications covering uses in catalysis and different fields of materials science and solid state physics. It is also widely recognized that the properties of the particles can be significantly different from the bulk materials. Therefore many efforts have been made to stabilize ZnO nanoparticles, including employing different organic ligands and initiating polymerization on nanoparticle surfaces.

In the course of our extensive studies on the modeling active sites in the oxygenation of zinc alkyls[1] as well as in the ring-opening polymerization of heterocyclic monomers,[2] we have developed mild procedures for generating capsules with ZnO quantum dots or its higher aggregates. Our advance involves the straightforward synthesis of an alkylzinc complex supported by a multifunctional ligand followed by its controlled treatment by air, which offers a finely tuned environment for ZnO chemistry. This methodology was extended to the synthesis of polymer-coated ZnO nanosize cages and particles through a three-step approach: the formation of well-defined catalytically active organozinc clusters, the polymerization process of heterocyclic monomers, and the oxygenation of the as-formed nanoparticles. The resulting nanoparticles with intense blue fluorescence can be redissolved by many solvents to form stable colloids that are convenient for further processing.

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[1] J. Lewiński, W. Marciniak, I. Justyniak, J. Lipkowski, J. Am. Chem. Soc. 2003, 125, 12698. J. Lewiński, E. Bojarski, Z. Ochal, I. Justyniak, J. Lipkowski, Angew. Chem. Int. Ed. 2003. 38, 4643. J. Lewiński, W. Śliwiński, M. Dranka, I. Justyniak, J. Lipkowski, Angew. Chem. Int. Ed. 2006, 45, 4826.

[2] J. Lewiński, P. Horeglad, K. Wójcik, I. Justyniak, Organometallics, 2005, 24, 4588. J. Lewiński, P. Horeglad, M. Kościelski, I. Justyniak, J. Lipkowski, Chem. Eur. J., in press.
 

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Presentation: Oral at E-MRS Fall Meeting 2007, Symposium A, by Janusz Lewiński
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-11 12:58
Revised:   2009-06-07 00:44