European Journal of Chemistry 2018, 9(1), 39-43 | doi: https://doi.org/10.5155/eurjchem.9.1.39-43.1676 | Get rights and content






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Comparison of the observed size-dependent melting point of CdSe nanocrystals to theoretical predictions


Albert Demaine Dukes III (1,*) orcid , Christopher Dylan Pitts (2) orcid , Anyway Brenda Kapingidza (3) orcid , David Eric Gardner (4) orcid , Ralph Charles Layland (5) orcid

(1) Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
(2) Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
(3) Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
(4) Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
(5) Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
(*) Corresponding Author

Received: 28 Nov 2017 | Revised: 02 Jan 2018 | Accepted: 07 Jan 2018 | Published: 31 Mar 2018 | Issue Date: March 2018

Abstract


Cadmium selenide nanocrystals were observed to have a size-dependent melting point which was depressed relative to the bulk melting temperature. The observed size-dependent melting point ranged from 500-1478 K, while a model based on the surface area to volume ratio predicted that is should range between 774-1250 K. The nanocrystals were heated in situ in the electron microscope, and the melting point was almost immediately followed by the vaporization of the CdSe nanocrystals, allowing for straightforward determination of the melting temperature. The differences between the observed melting point of CdSe nanocrystals and the values predicted by the surface area to volume ratio model indicates that additional factors are involved in the melting point depression of nanocrystals.


Keywords


CdSe; Size effects; Nanocrystals; Phase transitions; Electron microscopy; Melting point depression

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DOI: 10.5155/eurjchem.9.1.39-43.1676

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Funding information


Lander Foundation, Lander University, Greenwood, SC 29649, United States of America

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How to cite


Dukes III, A.; Pitts, C.; Kapingidza, A.; Gardner, D.; Layland, R. Eur. J. Chem. 2018, 9(1), 39-43. doi:10.5155/eurjchem.9.1.39-43.1676
Dukes III, A.; Pitts, C.; Kapingidza, A.; Gardner, D.; Layland, R. Comparison of the observed size-dependent melting point of CdSe nanocrystals to theoretical predictions. Eur. J. Chem. 2018, 9(1), 39-43. doi:10.5155/eurjchem.9.1.39-43.1676
Dukes III, A., Pitts, C., Kapingidza, A., Gardner, D., & Layland, R. (2018). Comparison of the observed size-dependent melting point of CdSe nanocrystals to theoretical predictions. European Journal of Chemistry, 9(1), 39-43. doi:10.5155/eurjchem.9.1.39-43.1676
Dukes III, Albert, Christopher Dylan Pitts, Anyway Brenda Kapingidza, David Eric Gardner, & Ralph Charles Layland. "Comparison of the observed size-dependent melting point of CdSe nanocrystals to theoretical predictions." European Journal of Chemistry [Online], 9.1 (2018): 39-43. Web. 27 Jan. 2020
Dukes III, Albert, Pitts, Christopher, Kapingidza, Anyway, Gardner, David, AND Layland, Ralph. "Comparison of the observed size-dependent melting point of CdSe nanocrystals to theoretical predictions" European Journal of Chemistry [Online], Volume 9 Number 1 (31 March 2018)

DOI Link: https://doi.org/10.5155/eurjchem.9.1.39-43.1676

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