European Journal of Chemistry

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

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Published: Mar 31, 2018
DOI: https://doi.org/10.5155/eurjchem.9.1.39-43.1676
Keywords:
CdSe, Size effects, Nanocrystals, Phase transitions, Electron microscopy, Melting point depression
Section
Research Article
Issue
Vol. 9 No. 1 (2018): March 2018
Dates
Received 2017-11-28
Accepted 2018-01-07
Published 2018-03-31
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Main Article Content

Albert Demaine Dukes III
Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
http://orcid.org/0000-0001-7939-0619
Christopher Dylan Pitts
Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
http://orcid.org/0000-0003-2263-4912
Anyway Brenda Kapingidza
Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
http://orcid.org/0000-0001-8517-6299
David Eric Gardner
Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
http://orcid.org/0000-0003-1912-6394
Ralph Charles Layland
Department of Physical Sciences, Lander University, Greenwood, SC 29649, United States of America
http://orcid.org/0000-0002-1748-1424

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.


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Dukes III, A. D.; Pitts, C. D.; Kapingidza, A. B.; Gardner, D. E.; Layland, R. C. Comparison of the Observed Size-Dependent Melting Point of CdSe Nanocrystals to Theoretical Predictions. Eur. J. Chem. 2018, 9, 39-43.

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