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Chemical synthesis and optical characterization of regular and magic-sized CdS quantum dot nanocrystals using 1-dodecanethiol

Published online by Cambridge University Press:  23 March 2015

Rachel E. Dickson  and
Michael Z. Hu
Rachel E. Dickson
Affiliation:
Department of Chemical and Biomolecular Engineering, University of Tennessee, Tennessee 37996, USA
Michael Z. Hu*
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6181, USA
*
a)Address all correspondence to this author. email: hum1@ornl.gov
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Abstract

Cadmium sulfide (CdS) quantum dot (QD) nanoparticles have been synthesized using a one-pot noninjection reaction procedure in solvent medium 1-octadecene. This approach used a cadmium salt and 1-dodecanethiol, an organic sulfur, as the cadmium and sulfur sources, respectively, along with a long-chain organic acid (myristic acid, lauric acid, or stearic acid). The acid has dual effects as a surface capping ligand and a solubility controlling agent as well. UV–Vis and photoluminescence (PL) spectrometry techniques were used to characterize the optical properties, along with transmission electron microscopy (TEM) to identify the structure and size. Our newly developed synthesis procedure allowed for investigation of both regular and “magic-sized” CdS QDs by systematically controlling reaction parameters such as reactant type, reactant concentration, and reaction temperature. The organic sulfur (1-dodecanethiol) proved to be a useful sulfur source for synthesizing magic-sized CdS QDs, previously unreported. Several distinctive size regimes of magic-sized quantum dots (MSQDs), including Families 378 and 407, were successfully produced by controlling a small number of factors. The understanding of controlled Cd release in a MSQD formation mechanism is developed.

Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 7 , 14 April 2015 , pp. 890 - 895
Copyright
Copyright © Materials Research Society 2015 

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