Nano Lett., 7 (10), 2951 -2959, 2007. 10.1021/nl072003g S1530-6984(07)02003-6
Web Release Date: September 11, 2007

Copyright © 2007 American Chemical Society

Seeded Growth of Highly Luminescent CdSe/CdS Nanoheterostructures with Rod and Tetrapod Morphologies

Dmitri V. Talapin,* James H. Nelson, Elena V. Shevchenko, Shaul Aloni, Bryce Sadtler, and A. Paul Alivisatos

The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Department of Chemistry, University of California, Berkeley, California 94720

Received August 10, 2007

Abstract:

We have demonstrated that seeded growth of nanocrystals offers a convenient way to design nanoheterostructures with complex shapes and morphologies by changing the crystalline structure of the seed. By using CdSe nanocrystals with wurtzite and zinc blende structure as seeds for growth of CdS nanorods, we synthesized CdSe/CdS heterostructure nanorods and nanotetrapods, respectively. Both of these structures showed excellent luminescent properties, combining high photoluminescence efficiency (~80 and ~50% for nanorods and nanotetrapods, correspondingly), giant extinction coefficients (~2 × 107 and ~1.5 × 108 M-1 cm-1 at 350 nm for nanorods and nanotetrapods, correspondingly), and efficient energy transfer from the CdS arms into the emitting CdSe core.

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