One-Pot Encapsulation of Luminescent Quantum Dots Synthesized in Aqueous Solution by Amphiphilic Polymers
| Autor: | Lihui Yuwen, Biqing Bao, Haoting Lu, Zhimin Luo, Hua Zhang, Xingrong Zhu, Jing Tian, Ge Liu, Lianhui Wang, Freddy Yin Chiang Boey |
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| Přispěvatelé: | School of Materials Science & Engineering |
| Rok vydání: | 2011 |
| Předmět: |
Luminescence
Photoluminescence Materials science Polymers Acrylic Resins Quantum yield Nanotechnology Sulfides Micelle Biomaterials Surface-Active Agents chemistry.chemical_compound Quantum Dots Amphiphile Cadmium Compounds General Materials Science Amines Acrylic acid chemistry.chemical_classification Aqueous solution General Chemistry Polymer Engineering::Materials [DRNTU] Solutions chemistry Chemical engineering Quantum dot Electrophoresis Polyacrylamide Gel Spectrophotometry Ultraviolet Tellurium Biotechnology |
| Zdroj: | Small. 7:1456-1463 |
| ISSN: | 1613-6810 |
| DOI: | 10.1002/smll.201002039 |
| Popis: | A simple one-pot polymer encapsulation method is developed for group II–VI semiconductor quantum dots (QDs) synthesized in aqueous solution. The micelles of amphiphilic polymers, such as octadecylamine-modified poly(acrylic acid), capture and encapsulate the QDs when the original hydrophilic ligands, namely 3-mercaptopropionic acid (MPA), capped on the CdTe/CdS core/shell QDs are partially or fully exchanged by the hydrophobic ligands, 1-dodecanethiol. The molar ratio of the amphiphilic polymer to QDs plays a crucial role in determining the final morphology of the encapsulated structures, including the number of QDs encapsulated in one polymeric micelle. Importantly, the polymer coating significantly improves the optical properties of the QDs, which enhances the photoluminescence quantum yield by about 50%. Furthermore, the photostability of the amphiphilic polymer-coated QDs is much better than that of the synthesized QDs capped with MPA. |
| Databáze: | OpenAIRE |
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