Nucleation Rates for Cd-Se Nanoparticles

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Semiconducting Cd-Se nanoparticles have become an active area of research in recent years due to, among other reasons, their size-dependent light emission properties. These nanoparticles can be grown in laboratories and fine-tuned to exhibit desired optical and energy-absorbing properties. This Demonstration shows how these nucleation conditions can be altered by varying the parameters of temperature and composition in crystalline media. The nucleation rate is given by the equation:

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By manipulating the nucleation conditions, particularly temperature , surface free energy , and supersaturation , researchers can create measurable differences in nucleation rate and better control the number of crystal nuclei in the media. The graphic at the lower right gives a rough sketch of the nucleation process, measured in arbitrary units (au).

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Contributed by: Neil Shah, Fawaz Hussain, and Hamid Helmi (December 2016)
Additional contributions by: Eitan Geva (University of Michigan)
Open content licensed under CC BY-NC-SA


Details

References

[1] J. van Embden and P. Mulvaney, "Nucleation and Growth of CdSe Nanocrystals in a Binary Ligand System," Langmuir, 21(22), 2005 pp. 10226–10233. doi:10.1021/la051081l.

[2] T. Kippeny, L. A. Swafford and S. J. Rosenthal, "Semiconductor Nanocrystals: A Powerful Visual Aid for Introducing the Particle in a Box," Journal of Chemical Education, 79(9), 2002 pp. 1094–1100. doi:10.1021/ed079p1094.

[3] S. G. Kwon and T. Hyeon, "Formation Mechanisms of Uniform Nanocrystals via Hot-Injection and Heat-Up Methods," Small, 7(19), 2011 pp. 2685–2702. doi:10.1002/smll.201002022.

Submission from the Compute-to-Learn course at the University of Michigan.


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