Spectroscopic Evaluation of the Nucleation and Growth for Microwave-Assisted CdSe/CdS/ZnS Quantum Dot Synthesis
| العنوان: | Spectroscopic Evaluation of the Nucleation and Growth for Microwave-Assisted CdSe/CdS/ZnS Quantum Dot Synthesis |
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| المؤلفون: | Andrew Zane, W. James Waldman, Prabir K. Dutta, Christie McCracken, Deborah A. Knight |
| المصدر: | The Journal of Physical Chemistry C. 118:22258-22267 |
| بيانات النشر: | American Chemical Society (ACS), 2014. |
| سنة النشر: | 2014 |
| مصطلحات موضوعية: | 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 |
| الوصف: | 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... |
| تدمد: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp504755a |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::cc3e0687a4f9e8e7483676a1ad008e9f https://doi.org/10.1021/jp504755a |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........cc3e0687a4f9e8e7483676a1ad008e9f |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19327455 19327447 |
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| DOI: | 10.1021/jp504755a |