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Mechanisms of the Shape Evolution of CdSe Nanocrystals
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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Cites
An efficient prebiotic synthesis of cytosine and uracil
Robertson, M. P., & Miller, S. L. (1995) · Nature · doi:10.1038/375772a0 · Cited by 272
Cited by
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Chemistry and Properties of Nanocrystals of Different Shapes
Burda, C., Chen, X., Narayanan, R., & El-Sayed, M. A. (2005) · Chemical Reviews · doi:10.1021/cr030063a · Cited by 7,230
Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystals
Yu, W. W., Qu, L., Guo, W., & Peng, X. (2003) · Chemistry of Materials · doi:10.1021/cm034081k · Cited by 4,997
Self-citationMechanisms of Nucleation and Growth of Nanoparticles in Solution
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Kongkanand, A., Tvrdy, K., Takechi, K., Kuno, M., & Kamat, P. V. (2008) · Journal of the American Chemical Society · doi:10.1021/ja0782706 · Cited by 1,644
Metadata
- Authors
- Peng, Z. A., & Peng, X.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- 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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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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