Nano Archive

Evolutionary shape control during colloidal quantum-dot growth

Nair, P. Sreekumari and Fritz, Karolina P. and Scholes, Gregory D. (2007) Evolutionary shape control during colloidal quantum-dot growth. SMALL, 3 (3). pp. 481-487.

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Size-depcndent optical properties of semiconductor nanocrystals are of great interest because of the myriad of phenomena stemming from them. The preparation of more complex colloidal shapes will facilitate the systematic study of shape-dependent phenomena. It is shown that a strategy to obtain systematically more complex nanocrystal structures is to exert a sequence of shape-directing steps during the colloidal growth. Using experiments based on multiple reagent injections we show how changes in the type of surfactant introduced during growth of CdSe nanocrystals promotes shape evolution. On this basis, we propose a means to achieve a further generation of shape design in nanometer-sized colloids by using a series of growth steps, each one building from the previous conditions of shape as well as surface-specific reactivity. To understand the shape formation and stability in nanocrystalline colloids, and particularly the importance of surface ligands, we introduce an analogy with the thermodynamics of droplets.

Item Type:Article
Uncontrolled Keywords:multipods; nanocrystals; quantum dots; shape control; thermodynamics
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
ID Code:2507
Deposited By:Farnush Anwar
Deposited On:07 Jan 2009 15:18
Last Modified:09 Jan 2009 10:34

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