Effect of protons on CdSe and CdSe-ZnS nanocrystals in organic solution
Core and core-shell quantum dots are covered with a layer of organic ligands which prevents aggregation and eliminates surface defects, thus enhancing the photophysical properties and stability of the material. These ligands are usually Lewis bases and can therefore be affected by the presence of ac...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1992. - 29(2013), 44 vom: 05. Nov., Seite 13352-8 |
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| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2013
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Cadmium Compounds Ligands Organic Chemicals Protons Selenium Compounds Solutions Sulfides Zinc Compounds mehr... |
| Zusammenfassung: | Core and core-shell quantum dots are covered with a layer of organic ligands which prevents aggregation and eliminates surface defects, thus enhancing the photophysical properties and stability of the material. These ligands are usually Lewis bases and can therefore be affected by the presence of acid in the surrounding environment. We synthesized core CdSe and core-shell CdSe-ZnS quantum dots with various shell thicknesses and different organic ligands, and we investigated the effect of acid and base on their photophysical properties. In dilute CHCl3 solution, the organic ligands can be protonated upon addition of acid and detached from the surface of the nanoparticles. As a consequence, the nanoparticles aggregate and their luminescence is quenched. Aggregated particles can be partly disgregated and the luminescence restored by deprotonation of the free ligands with a base. Since the presence of organic ligands on the surface is an essential characteristic of quantum dots, these effects should be taken into consideration when designing quantum dot-based sensors |
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| Beschreibung: | Date Completed 05.06.2014 Date Revised 05.11.2013 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la4028404 |