TITLE:

ULTRASMALL MAGIC-SIZE NANOCRYSTALS OF II-VI GROUP SEMICONDUCTORS

DATE:

Friday, March 6th, 2009

TIME:

3:30 PM

LOCATION:

GMCS 214

SPEAKER:

Gregory Kalyuzhny, Department of Chemistry and Biochemistry, SDSU

ABSTRACT:

Discovery of fullerenes with their defined stoichiometries (C60, C70, …) had a huge impact on chemistry, physics, and the emerging area of nanomaterials. While both the composition and the factors governing the stabilization of fullerenes are understood, less is known about magic-size nanocrystals of semiconducting materials. We report highly selective synthesis of magic size CdSe and CdTe nanocrystals. Both CdSe and CdTe magic size nanocrystals exhibit narrow absorbance while only CdSe nanocrystals show broad surface-state induced luminescence. The shape of the photoluminescence spectra as well as the emission intensity are effectively controlled by the selection of surface ligands. Possible stoichiometry of these magic size nanocrystals is discussed. Magic-size nanocrystals are highly-monodisperse and form superlattices detected with TEM and XRD.

HOST:

Andy Cooksy

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