Spectroscopic Evaluation of the Nucleation and Growth for Microwave-Assisted CdSe/CdS/ZnS Quantum Dot Synthesis

Autor:	Andrew Zane, W. James Waldman, Prabir K. Dutta, Christie McCracken, Deborah A. Knight
Rok vydání:	2014
Předmět:	Chemistry Microwave oven Nucleation Analytical chemistry Quantum yield Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Quantum dot Fluorometer Yield (chemistry) Physical and Theoretical Chemistry Deposition (law) Microwave
Zdroj:	The Journal of Physical Chemistry C. 118:22258-22267
ISSN:	1932-7455 1932-7447
Popis:	Use of microwave radiation to speed up the synthesis of CdSe-based quantum dots (QDs) in aqueous media is of practical interest and is the focus of this study. However, such microwave methods usually lead to low quantum yield (QY) QDs as compared to the conventional organic-based synthesis. By coupling the microwave oven with a fluorometer via a fiber optic cable, the fluorescence spectra during the QD evolution were obtained. Using the composition Cd4:Se1:Zn4:MPA20 (MPA = 3-mercaptopropionic acid), several stages of QD growth including development of CdSe nuclei, followed sequentially by CdS and then ZnS deposition were noted. The temperature of the microwave reaction between 130 and 155 °C led to QDs with similar QYs (17–19%), with the lower temperature taking longer to reach the optimal yield. The nucleation step was carried out at temperatures varying from 0 to 100 °C followed by growth in the microwave oven. With increasing temperature of nucleation, there was a red-shift in emission maximum, varying...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cc3e0687a4f9e8e7483676a1ad008e9f https://doi.org/10.1021/jp504755a Zobrazit plný text záznamu