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Cited by 1,279

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Mechanisms of the Shape Evolution of CdSe Nanocrystals

Peng, Z. Adam, Peng, Xiaogang·2001·Journal of the American Chemical Society

Abstract

The temporal shape evolution of CdSe quantum confined nanorods (quantum rods) in nonaqueous solvents with organometallic precursors was studied quantitatively and systematically. The experimental results revealed three distinguishable stages in the shape evolution. At high monomer concentrations, nanocrystals grow exclusively along the c -axis of the wurtzite structure, making this axis the long axis of the rods. At intermediate concentrations, nanocrystals grow simultaneously in three dimensions. At low monomer concentrations, the aspect ratio decreases in a process controlled by intraparticle diffusion on the surface of the nanocrystals. This intraparticle ripening stage is different from normal Ostwald ripening, which occurs at lower monomer concentrations and is by monomer migration from small to larger ones. Addition of hexylphosphonic acid or tetradecylphosphonic acid, strong cadmium ligands, is important mainly because it enables the high monomer concentrations needed for the growth of quantum rods. A simple model is proposed to explain the growth of faceted CdSe nanocrystals on the basis of diffusion control.

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Metadata

Authors
Peng, Z. A., & Peng, X.
Venue
Journal of the American Chemical Society
Published
2001-01-30
Volume
123
Issue
7
Pages
1389-1395
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2091289270
Cited by
1,279
References
1
FWCI
40.16
Type
journal article
Language
en
Open access
closed

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