| Titre : | Highly photoluminescent and stable aqueous ZnS quantum dots (2010) |
| Auteurs : | Li, Hui, Auteur ; Shih, Wan Y., Auteur ; Shih, Wei-Heng, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 49 N° 2, Janvier 2010) |
| Article en page(s) : | pp 578–582 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | Aqueous photoluminescent ZnS quantum Mercaptopropionic acid. |
| Résumé : | We report an all-aqueous synthesis of highly photoluminescent and stable ZnS quantum dots (QDs) with water as the medium. The method involves first synthesizing ZnS QDs with 3-mercaptopropionic acid (MPA) as the capping molecule and then replacing some of the MPA with (3-mercaptopropyl)trimethoxysilane (MPS). The resultant MPS-replaced ZnS QDs were about 5 nm in size with a cubic zinc blende crystalline structure, and they had both MPA and MPS on the surface as confirmed by Fourier transform infrared (FTIR) spectroscopy. They exhibited blue trap-state emissions around 415 nm and a quantum yield (QY) of 75% with rhodamine 101 as the reference, and they remained stable for more than 60 days under ambient conditions. Through the capping-molecule replacement procedure, the MPS-replaced ZnS QDs avoided the shortcomings of both MPA/ZnS QDs and MPS/ZnS QDs and acquired the advantages of strong photoluminescence and good stability, which are important to QD applications, especially for bioimaging. |
| DEWEY : | 660 |
| ISSN : | 0888-5885 |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie901086d |
